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篇1：as定语从句用法总结参考
as定语从句用法总结参考
一、as引导定语从句
as引导定语从句时，既可以引导限定性定语从句，又可以引导非限定性定语从句。区分as引导定语从句和其它从句的关键特征是：as引导定语从句时在从句中做成分，通常做主语或宾语。
1、as引导限定性定语从句
如从句所修饰的名词前有such、the same、as出现，后面的定语从句将由as引导，形成such...as，the same...as，as…as这样的固定结构，译为“和……一样”。
例1：I never heard such stories as he told.
我从未听过他所讲的那样的故事。
例2：He’ll repeat such questions as are discussed in the book.
他将重复书中讨论过的问题。
例3：They made the same mistake as others would have made on such an occasion.
他们犯了和其他人在这种场合下会犯的同样错误as用法详解as用法详解。
2、as引导非限定性定语从句
as引导非限定性定语从句，往往指代一整句话，通常表示“正如”的意思。as引导的非限制性定语从句位置相对比较灵活，可以位于先行词之前、之后或中间。
例：As is known to everybody, the moon travels round the earth.
众所周知，月亮绕着地球转。
二、as引导时间状语从句
as引导时间状语从句多用于口语，强调“同一时间”或“一先一后”，有时还有“随着”的含义。
例1：As I was going out, it began to rain.
当我出门时，开始下雨了。(as强调两个动作紧接着发生，不强调下雨的.特定时间。)
例2：As time goes on, he will understand what I said.
随着时间的推移，他会理解我所讲的话。
三、as引导原因状语从句
as表示“因为”，与because相比，较口语化，所表达的原因语气较弱，所表的原因比较明显，或是已知的事实。
例1：As the weather is so bad, we have to delay our journey.
因为天气太糟糕，我们不得不推迟旅行。
例2：Any new source of energy will be very welcome, as there is already a shortage of petroleum.
任何新型能源都将大受欢迎，因为石油已经出现短缺。
四、as引导方式状语从句
as表示“按照”，“以……方式”，“像……一样”，“正如”。
例：Do as the Romans do when in Rome. 入乡随俗
注：as在引导方式状语从句时，还常出现在一个固定的类比结构中：(just) as …, so…。这一句型表示类比，基本含义是“正如……，所以……”。
例：Just as virtue is its own reward, so is vice its own punishment.
善有善报，恶有恶报。
五、as引导让步状语从句
as可以表示“尽管”，“虽然”，引导让步状语从句，但必须构成倒装。让步状语从句倒装规则有两类：
1、形容词/副词/分词/名词(无冠词)/介词短语等+as+主语+谓语动词，主句。
例1：Much as I like you, I couldn’t live with you.
我尽管很喜欢你，却不能和你在一起生活。
例2：Child as he is, he knows to help others.
尽管他是个孩子，他懂得帮助别人。
2、动词原形+as+主语+助动词(may/might, will/would, can/could, do/does/did)，主句as用法详解考研英语。
例：Try as we may, we cannot sense directly the television signal sent out from the broadcast station.
尽管我们费了很大的劲，也无法直接觉察发射台发出的电视信号
六、as引导比较状语从句
as引导比较状语从句，其基本结构是as…as。前一个as是副词，后一个as是比较状语从句的连词。否定结构为not so much … as …。
例1：Small as it is, the ant is as much a creature as are all other animals on the earth.
尽管蚂蚁很小，但是它同地球上的任何其他动物一样，也是一种动物。
例2：It was not so much the many blows he received as the lack of fighting spirit that led to his losing the game.
与其说是他受到了许多打击，还不如说是缺乏斗志使他输掉了比赛。
篇2：定语从句as的用法总结
定语从句as的用法总结
(1) as引导的定语从句修饰表人或物的先行词，即先行词可以是人也可以是物；在定语从句中可以做主语、宾语或表语；常用于the sameas/suchas/as(so)as句型，as不论在定语从句中作何成分，均不能省略。
① 先行词为人such teachers， as作主语
②I’ll buy the same bike as I lost yesterday. 先行词为物the same bike，as作宾语 ,指同一类事物 ※此时注意和the same that 引导的定语从句的区别
It’ that引导定语从句，作宾语，指同一个事物
※ She wore the same dress that she wore at Mary's wedding. (the samethat特指同一个) 她穿着她在Mary婚礼上穿过的同一条裙子。 (the sameas 泛指同一类) 她穿着和她妹妹所穿的一样的裙子。 那块手表和我丢失的一模一样。(the sameas 泛指同一类) 那就是我丢失的那块手表。(the samethat特指同一个) ③The school is just the same one as it was 10 years ago.
先行词为物the same one (school), as作表语
It’ 先行词为物so heavy a box，as作宾语
此时应注意as引导的定语从句和结果状语从句such / sothat的区分
It’ 结果状语从句sothat如此以至于 ※He is such a good student as is liked by everyone.(定语从句，as在从句中作主语) （结果状语从句suchthat） that在从句中不充当任何成分，故不是定语从句，而是结果状语从句
(2) as引导的非限制性定语从句可以修饰整个主句, 可以放在主句前，主句后或插入主句中间。此时as含有“正如” 之意。常用的as引导的非限制性定语从句固定表达有：
as we all know / as everyone knows / as is known to all / as is well-known (众所周知)/ as I can remember(正如我所记得的') / as we expect / as was expected (正如预料的那样)/ as often happens / as we all can see / as can be seen / as has been said before (如前所述)…
As everyone knows, Shakespeare is a famous writer.
Shakespeare is a famous writer, as everyone knows.
Shakespeare, as everyone knows , is a famous writer.
(3)注意which引导的非限制性定语从句也可以修饰整个主句, 但不能放在主句前，常译为“这一点、这件事”。
She is working hard, which everyone can see.which引导的非限制性定语从句不能放在主句前 She is working hard, as everyone can see.﹦As everyone can see, She is working hard.
(4)注意当修饰整个主句时，as引导的非限制性定语从句含“正如”之意，因此在意义上不能和主句相抵触；which引导的非限制性定语从句则无此限制。如： 我们的球队输了比赛，这一点是未预料到的。此时不能用as。我们的球队赢了比赛，正如预料的那样。
篇3：定语从句用法的总结
定语从句用法的总结
一.定语从句及相关术语
1.定语从句：修饰某一句中的.名词或代词的从句称为定语从句，一般紧跟在它所修饰的先行词后面。被修饰的词称为先行词。
2.关系词：引导定语从句的关联词称为关系词
关系词有关系代词和关系副词。关系代词有that, which, who, whom, whose, as等;关系副词有where, when, why等。
关系词常有3个作用：1，引导定语从句。2，代替先行词。3，在定语从句中担当一个成分。
二.关系代词引导的定语从句
1.who指人，在从句中做主语
(1)The boys who are playing football are from Class One.
(2)Yesterday I helped an old man who lost his way.
2. whom指人，在定语从句中充当宾语，常可省略。
(1) Mr. Liu is the person (whom) you talked about on the bus.
(2) Mr. Ling is just the boy whom I want to see.
注意：关系代词whom在口语和非正式语体中常用who代替，可省略。
(3) The man who/whom you met just now is my friend.
3. which指物，在定语从句中做主语或者宾语，做宾语时可省略
(1) Football is a game which is liked by most boys.
(2) This is the pen (which) he bought yesterday.
4. that指人时，相当于who或者whom;指物时，相当于which。在宾语从句中做主语或者宾语，做宾语时可省略。
(5) The number of the people that/who come to visit the city each year
rises one million.
(6) Where is the man that/whom I saw this morning?
5. whose通常指人，也可指物，在定语从句中做定语
(1) He has a friend whose father is a doctor.
(2) I once lived in a house whose roof has fallen in.
whose指物时，常用以下结构来代替
(3)The classroom whose door is broken will soon be repaired.
(4)The classroom the door of which is broken will soon be repaired.
(5)Do you like the book whose cover is yellow? (6)Do you like the book the color of which is yellow?
三.介词+关系代词引导的定语从句
1. 关系代词在定语从句中做介词宾语时，从句常由介词+关系代词引导
(1)The school (that/which) he once studied in is very famous.
(2)The school in which he once studied is very famous.
(3)Tomorrow I will bring here a magazine (that/which) you asked for.
(4)Tomorrow I will bring here a magazine for which you asked.
(5)We’ll go to hear the famous singer (whom/that/who) we have often talk-ed about.
(6) We’ll go to hear the famous singer about whom we have often talked.
2.关系代词前的介词的选择
* 由先行词的习惯搭配或根据先行词的需要。
(1) The speed at which light travels is 300,000 km per second. (at the speed of …以…速度)
(2) The reason for which he didn’t come to school was that he was ill. (for a certain reason 由于某种原因)
* 介词可能是从句短语动词的一个固定部分或固定搭配
(3) Don’t bring children to see the animals of which they are afraid. (be afraid of 害怕)
(4) This is the teacher from whom I borrowed the book. (borrow from…从…借入
注意：1. 含有介词的动词短语一般不拆开使用，如：look for, look after, take care of等
(1) This is the watch which/that I am looking for. (T)
(2) This is the watch for which I am looking. (F)
2. 若介词放在关系代词前，关系代词指人时用whom，不可用who或者that;指物时用 which，不能用that;关系代词是所有格时用whose
(1) The man with whom you talked is my friend. (T)
(2) The man who/that you talked with is my friend. (F)
(3) The plane in which we flew to Canada is very comfortable. (T)
(4) The plane in that we flew in to Canada is very comfortable. (F)
3. “介词+关系代词”前可有some, any, none, both, all, neither, most, each, few等代词或者数词
(1) He loved his parents deeply, both of whom are very kind to him.
(2) In the basket there are quite many apples, some of which have gone bad.
(3) There are forty students in our class in all, most of whom are from big cities.
四.关系副词引导的定语从句
1. when指时间，在定语从句中做时间状语
(1) I still remember the day when I first came to the school.
(2) The time when we got together finally came.
2. where指地点，在定语从句中做地点状语
(1) Shanghai is the city where I was born.
(2) The house where I lived ten years ago has been pulled down.
3. why指原因，在定语从句中做原因状语
(1) Please tell me the reason why you missed the plane.
(2) I don’t know the reason why he looks unhappy today.
注意：1.关系副词引导的从句可以由“介词+关系代词”引导的从句替换
(1) The reason why/ for which he refused the invitation is not clear.
(2) From the year when/in which he was going to school he began to know what he wanted when he grew up.
(3) Great changes have taken place in the city in which./where I was born.
2.当先行词为时间、地点、原因名词时，如果在从句中不是作状语时，不可用关系副词引导。
(1)The reason (that/which) he gave for being late is that his mother was ill.
(2)They make me think of the happy days (that/which) we spent together.
(3)Is this factory the one (that/which) they visited the day before yester- day.
篇4：英语定语从句用法总结
英语定语从句用法总结
一、基本概念：
在复合句中，修饰某一名词或代词的从句叫定语从句。如：
Do you know the man who spoke at the meeting just now?
That is the house where he lived ten years ago.
定语从句所修饰的词叫先行词;定语从句一般用关系代词或关系副词来引导，关系词放在先行词与定语从句之间起连接作用，同时又作从句中的一个成分。
引导定语从句的关系代词有：that, who, whom, whose, which;
关系副词有：when, where, why.
二、关系词的用法：
(一)关系代词的用法：
1. 作主语用who, which和that, 如：
He is the man who/that lives next door.
The train which/that has just left is for Shenzhen.
2. 作宾语用whom, who, which, that, 如：
The man (whom/who/that) we have just seen is a famous writer.
Where is the book (which/that) I bought last week?
注：在非正式文体中，用于指人的关系代词who whom, that 通常可以省略，但在正式文体中通常用whom, 不可省略;用于指物的关系代词which和that 在非正式文体中也通常省略，但在正式文体中一般不省略。
3. 作定语用whose, 如：
(a) He is the man whose car was stolen last week.
(b) It was a meeting whose importance I did not realize at that time.
注：“whose +名词中心词”这一结构在定语从句中既能作主语(如上a句)，又能作宾语(如上b句)。whose 的先行词常用来指人，但有时也可以用来指具体事物或抽象概念，这时可以与of which 结构互换，词序是：“名词+of which”，如：
They came to a house whose back wall had broken down.. (= the back wall of which)
He’s written a book the name of which I’ve completely forgotten. (= whose name)
4. 作表语只用that ，它既可以指人，也可以指物，但时常省略。如：
He is no longer the man that he used to be.
This is no longer the dirty place (that) it used to be.
(二)关系副词的用法：
1.when 指时间，在从句中作时间状语，它的先行词通常有：time, day, morning, night, week, year 等。如：
I still remember the time when I first became a college student.
Do you know the date when Lincoln was born?
注：when时常可以省略，特别是在某些句型和某些时间状语中。如：
Each time he came, he did his best to help us.
But help never stopped coming from the day she fell ill.
2.where指地点，在从句中作地点状语。它的先行词通常有：place, spot, street, house, room,
city, town, country等，如：
This is the hotel where they are staying.
I forget the house where the Smiths lived.
注：where有时也可以省略。如：
This is the place (where) we met yesterday.
3. why指原因或理由，它的先行词只有reason。如：
That is the reason why he is leaving so soon.
注：why时常也可以省略。如：
That is the real reason he did it.
(三) 使用关系副词应注意下列几点：
1. 这三个关系副词在意义上都相当于一定的介词+which结构：
when = on (in, at, during…) + which;
where = in (at, on…) + which;
why = for which. 如：
I was in Beijing on the day when (=on which) he arrived.
The office where (=in which) he works is on the third floor.
This is the chief reason why (=for which) we did it.
2. 当先行词是表时间的time, day等和表地点的place, house等时，一定要注意分析从句的结构，如果缺少主语或宾语时，关系词应该用which或that, 缺少时间状语或地点状语时，才能用when或where，试比较：
I’ll never forget the day when my hometown was liberated.
I’ll never forget the days which/that we spent together last summer.
His father works in a factory where radio parts are made.
His father works in a factory which/that makes radio parts.
3. when和where既可以引导限制性定语从句，也可以引导非限制性定语从句。而why 只
能引导限制性定语从句。
三.限制性定语从句与非限制性定语从句
1.限制性定语从句说明先行词的情况，对先行词起限定作用，与先行词关系十分密切，不可用逗号隔开，也不可省略，否则全句意义就不完整。如：
This is the telegram which he refers to.
Is there anything (that) I can do for you?
2.非限制性定语从句只是对先行词作补充说明，没有限定作用，它与先行词的关系比较松散，因而不是关键性的，如果省略，原句的意义仍然完整。这种从句在朗读时要有停顿，在文字中通常用逗号与主句隔开。如：
This note was left by Tom, who was here a moment ago.
As a boy, he was always making things, most of which were electric.
引导非限制性定语从句的关系词有：who, whom, whose, which, when 和 where，不可以用that和why。
另外，非限制性定语从句从意义上讲，相当于一个并列句，在口语中使用并不普遍，在日常生活中，人们通常用并列句或简单句来表达。如：
I told the story to John, who later did it to his brother.
= I told the story to John, and he later told it to his brother.
Yesterday I happened to see John, who was eager to have a talk with you.
= Yesterday I happened to see John and he was eager to have a talk with you.
3.两种定语从句的内涵不同，限制性定语从句具有涉他性，而非限制性定语从句具有 唯一性，这在理解和翻译时应特别注意。试比较：
All the books there, which have beautiful pictures in them, were written by him.
All the books there that have beautiful pictures in them were written by him.
His brother, who is eighteen years old, is a PLA man. (只有一个)
His brother who is a PLA man is eighteen years old. (不止一个)
4.有时，非限制性定语从句所修饰的不是某一个词，而是整个主句或是主句中的一个部分，这时一般采用which或as来引导。如：
He passed the exam, which/as he hoped he would.
注：(1)as引导的从句可以放在主句之前，而which引导的从句只能放在主句之后。
They are hollow, which makes them very light.
As is known to all, Taiwan is a part of China.
(2)从意义上讲，which指前面主句的内容;而as指代的.是作为一般人都知道的常
识性的东西，因此常译成“就象… …那样”。
(3)如果定语从句的内容对主句的内容起消极作用，则用which，而不用as，如：
She stole her friend’s money, which was disgraceful.
He tore up my photo, which upset me.
5.在正式文体中，以the way为先行词的限制性定语从句通常以in which或 that 引导，如：
The way in which you answered the questions was admirable.
但在非正式文体中，人们通常省略in which或 that :
The way (in which) he spoke to us was suspicious.
I don’t like the way (that) you laugh at her.
四.关系词的选择
1. 在非限制性定语从句中，关系代词作主语，只能用who 指人，which指物;关系代词做宾语，常用whom(口语中有时用who)指人，which指物，它们都不能用that代替。
2. 关系代词作介词宾语，不论是在限制性定语从句中，还是在非限制性定语从句中，当介词前置时，只能用whom指人，which指物;但如果介词后置，则不受这种限制，关系代词还可以省去，特别是在口语中。如：
Do you know the boy to whom she was talking?
Do you know the boy (that) she was talking to?
The pencil (which/that) he was writing with suddenly broke.
3. 在限制性定语从句中，当先行词指物时，关系词可用which或that，二者常可以互换;但在下列情况中，只能用that，不用which：
(1) 当先行词是all, a lot, (a) little, few, much, none, anything, something, everything, nothing等词时。如：
All that can be done has been done.
In this factory I saw little / much that was different from ours.
(2) 当先行词被all, any no, much, little, few, every等限定词所修饰时。如：
We heard clearly every word that he said.
(3) 当先行词是序数词或被序数词所修饰时。如：
The first thing that should be done is to get the tickets.
When people talk about Hangzhou, the first that comes to mind is the West Lake.
(4) 当先行词是形容词最高级或被形容词最高级所修饰，以及先行词被序数词和形容
词最高级同时修饰时，如：
Is that the best that you can do?
That’s the most expensive hotel that we’ve ever stayed in.
This novel is the second best one that I have ever read.
(5) 当先行词被 the very, the only, the next, the last等所修饰时。如：
This is the very book that I want to find.
(6) 当先行词为指人和指物的两个并列名词词组时。如：
The guests spoke highly of the children and their performances that they saw at the Children’s Palace.
She described in her compositions the people and places that impressed her most.
(7) 当主句是以which开头的特殊疑问句时。如：
Which is the car that killed the boy?
4. 在限制性定语从句中，当先行词指人时，关系词可用who(m)或that，二者常可互换。
但在下列情况中，用who(m)，而不用that：
(1) 当先行词是one, ones, any, few, anyone, anybody, someone, somebody, everyone,
everybody等词时。如：
Is there anyone who can answer this question?
He was among the few who managed to live through the enemy prison camp.
注：在非正式文体中可以说：You’re the one that knows where to go.)
(2) 当先行词是he, they, those, people, person等词时。如：
He who wants to catch fish just not mind getting wet.
Those who are against the proposal put up your hands.
注：在固定结构的谚语或习语中，可用he that…。如：
He that promises too much means nothing.
(3) 当先行词有较长的后置定语修饰时。如：
Do you know the writer in blue with thick glasses who is speaking at the meeting?
(4) 在分隔式定语从句中，若先行词指人，为了明确修饰关系，应当用who(m)。如：
A new master will came tomorrow who will teach you German.
There’s only one student in the school who/whom I wanted to see.
I was the only person in my office who was invited.
(5) 两个定语从句同时修饰一个指人的先行词，第二个定语从句常用who(m)来引导，如：
She is the only girl I know who can play the guitar.
5. 在限制性定语从句中，当先行词指人时，在下列情况中，一般用关系词that:
(1) 当主句是以who或which开头的特殊疑问句时。如：
Who is the man that is reading the newspaper over there?
Which of us that knows anything does not know this?
(2) 当先行词被形容词最高级或序数词所修饰时。如：
He is the greatest man that has ever lived.
(3) 当先行词被the only, the very, the last等词所修饰时。如：
She is the only person that understands me.
6. 当先行词被the same所修饰时，关系词既可以用as，也可以用that。在表示具体事物
时，有时两者有一定的区别。一般说来，表示同一种类多用as，表示同一事物多用that。
如：
This is the same instrument that I used yesterday. 这就是我昨天用过的那台仪器。
This is the same instrument as I used yesterday. 这台仪器跟我昨天用过的那台一样。
在抽象概念上，同种类和同一事物是没有绝对区别的，所以两个词可换用：
I have the same opinion as / that you have.
这里要注意的是：
(1) 使用as时，它引导的定语从句中的动词可以省略，但使用that时，定语从句中
的动词不可省略。如：
Women received the same pay as men.
Women received the same pay that men received.
(2) 在“the same…that”结构中，that只是用来加强语气，强调“相同”。that可以省去而不改变句子原意，甚至连名词前的same也可以省去。如：
This is the same instrument that I used yesterday.
= This is the same instrument I used yesterday.
= This is the instrument I used yesterday.
但在“the same…as”结构中，same和as都不能省略。
(3) 当“the same…that”结构中的that作为关系副词用时，不可以直接与as互换。
如：
He lives in the same building that I live.
= He lives in the same building as / that I live in.
Shall we meet at the same place that we last met?
= Shall we meet at the same place that / as we last met at?
7. 当先行词前有such, so, as时，关系词应当用as。如：
A wise man seldom talks about such things as he doesn’t understand.
He spoke in such easy English as everybody could understand.
At this time of the day, all buses and trolleys have to carry as many passengers as they can.
It is so easy a book as every schoolboy can read.
Let’s discuss such things as we can talk of freely.
五.练习题
1. Don’t talk about such things of __________ you are not sure.
A. which
B. what
C. as
D. those
2. Is this the factory __________ you visited the other day?
A. that
B. where
C. in which
D. the one
3. Is this factory __________ some foreign friends visited last Friday?
A. that
B. where
C. which
D. the one
4. Is this the factory __________ he worked ten years ago?
A. that
B. where
C. which
D. the one
5. The wolves hid themselves in the places __________ couldn’t be found.
A. that
B. where
C. in which
D. in that
6. The freezing point is the temperature __________ water changes into ice.
A. at which
B. on that
C. in which
D. of what
7. This book will show you __________ can be used in other contexts..
A. how you have observed
B. what you have observed
C. that you have observed
D. how that you have observed
8. The reason is __________ he is unable to operate the machine.
A. because
B. why
C. that
D. whether
9. I’ll tell you __________ he told me last week.
A. all which
B. that
C. all that
D. which
10. That tree, __________ branches are almost bare, is very old.
A. whose
B. of which
C. in which
D. on which
11. I have bought the same dress __________ she is wearing.
A. as
B. that
C. which
D. what
12. He failed in the examination, __________ made his father very angry.
A. which
B. it
C. that
D. what
13. We’re talking about the piano and the pianist __________ were in the concert we attended last night.
A. which
B. whom
C. who
D. that
14. The girl __________ an English song in the next room is Tom’s sister.
A. who is singing
B. is singing
C. sang
D. was singing
15. Those __________ not only from books but also through practice will succeed.
A. learn
B. who
C. that learns
D. who learn
篇5：that引导的定语从句的用法总结
that的用法：
注意：that常用作关系代词，可指代某人，也可指代某物，指物时有的时候可用which替换that，指人时可用who替换。但在下列情况下，一般用that。
that指代某物事时：
1、先行词为all, few, little, much, the one, something, anything, everything, nothing等时。
（1）We'll do all that we can to protect the endangered plants and animals.
我们将尽我们的最大努力来保护那些濒危的动植物。
（2）There is much that I wan to tell you.
我有很多想要告诉你的话。
（3）Is there anything that I can do for you?
有什么我可以帮你的吗？
2、先行词被all, every, no, some, any, (a)few, (a)little, much等限定词修饰时。
（1）You can borrow any book that you want to read in our school library.
在我们图书馆，你可以借任何你想读的书。
3、先行词被序数词或形容词最高级修饰时。
（1）This is the most beautiful city that I've ever seen.
这是我见过的最漂亮的城市。
4、先行词被the only, the very, the right, the last 等修饰时。
（1）This is the very factory that they visited last summer holiday.
这恰好是他们去年参观的那个工厂。
（2）This is the only painting in this style that we have.
这种风格的画我们仅有一幅。
5、先行词是并列结构，既有人又有物时。
He talked happily of the writer and his books that interested him.
6、先行词前有the same修饰，表示和先行词是同一物时。
（1）This is the same purse that I lost yesterday.
这就是我昨天丢的那个钱夹。
注：如果表示的是与先行词同一类或相似的.某物，则用the same…as….
（2）This is the same purse as I lost yesterday.
这个钱夹和我昨天丢的那个一样。
7、先行词为数词时。
Look at the books on the bookshelf. You can see the two that you bought me for my birthday.
瞧书架上那些书。你可以看到我过生日时你买的那两本。
8、如果which引导的定语从句中又含有一个定语从句，为避免重复，第二个定语从句用that。
They built a factory which produced things that had never been seen.
他们建了一工厂，生产以前从未见过的东西。
篇6：which定语从句的用法总结
Tankfield emailed Pea some photos, which Pea did not find interesting.
which就近指代photos，photos是定语从句中的宾语，把定语从句还原成一个完整句就是Pea did not find the photos interesting.
可以看到，上面两个句子都可以以that为关系代词改写，即
(1)Tankfield emailed Pea some photos that did not cheer Pea up.
(2)Tankfield emailed Pea some photos that Pea did not find interesting.
which前面是介词，介词前面是名词，which就近指代介词前的那个名词，名词和介词之间有无逗号均可。
Tankfield once lent Pea a book from which Pea glimpsed the basics of genes.
这个句子可以“拆”成如下两句：（每个定语从句都可以拆成两句，以先行词为拆分点）
(1)Tankfield once lent Pea a book.
(2)Pea glimpsed the basics of genes from the book.
先行词实际上是定语从句中介词的宾语，这时，需要把介词提前，避免如下表达：
(1)Tankfield once lent Pea a book, which Pea glimpsed the basics of genes from. (XXX)
(2)Tankfield once lent Pea a book that Pea glimpsed the basics of genes from. (XXX)
上中学的`时候学过，which引导的定语从句叫“非限制性定语从句”，是不是？它怎么就“非限制性”了？回顾上述GMAT语法规定which有且仅有的两种用法，which指的都是就近的名词，从句其实还是限制性的。
所谓非限制性呢，是说which指逗号之前一套主谓所描述的情况，以逗号前的一个完整句为先行词。比如：
(1)Tankfield might never care to say Happy Birthday to Pea, which was rather sad.
(2)Tankfield might never care to say Happy Birthday to Pea, which Pea did not refuse to acknowledge to herself any more.
篇7：定语从句where用法
where引导定语从句的例句
1.She’s got herself into a dangerous situation where she’s likely to lose her life.
她将自己置于了危险的境地，而且很有可能丢掉性命。
2.I miss the place where I lived in my childhood.
我很想念我童年居住过的地方。
3.This is the place where he works.
这是他工作的'地点。
4.Tell me the place where the accident happened yesterday.
告诉我昨天发生事故的地点。
篇8：定语从句总结
定语从句总结
定语从句由关系代词who、whom、whose、which、what、as和关系副词where、when、why等引导，但须记住：
1.what不能引导定语从句.
2.关系词的分析须考虑它在定语从句中的成分。
一.指人的关系代词有who、whose、whom、that. 试分析：
The old man who/whom /that we visited yesterday is a famous artist.
Miss Wang is taking care of the child whose parents have gone to Beijing .
The man with whom my father shook hands just now is our headmaster. (=The man who/whom that my father shook hands with just now is our headmaster.)注：
A. 指人时有时只用who不宜用that。
1.先行词为one、ones或anyone
(1)The comrade I want to learn from is the one who studies hard and works hard.
(2)Anyone who breaks the law should be punished.
2.先行词为these时
These who are going to Beijing are the best students of our school.
3.在there be 开头的句子中
There is a student who wants to see you.
4.一个句子中带有两个定语从句，其中一个定语从句的关系代词是that，另一个宜用who，以免重复。
The student that won the first prize is the monitor who works hards.
5.在非限制性定语从句中
A。I met a friend of mine in the street, who had just come from Japan.
B.主句以who开头的句子中,只用that,不用who。
二.指物的关系代词有which、whose(=of which)、that. 试分析：
1. I like the books which / that were written by Lu Xun.
2. The desks (which/that) we made last year were very good.
3. This is the house in which we lived last year. (= This is the house which /that we lived in last year.)
4. I live in the room whose windows face south. (= I live in the room ,the windows of which face south.)
注：
A. 介词如果位于作为其宾语的关系代词之前时，只能用whom、which不能用who或that.
(1). The girl about whom they were talking is our monitor.
(2). The book in which there are many interesting things was written by Li Ming.
B. 部分短语动词中的介词不可与动词拆开，在定语从句中其介词不可前置，只能放在其动词之后。
Is this the book which she is looking for?
The old man who/whom they are waiting for is Professor Li.
The child who/whom she is looking after is Wang Ping’s son.
C. 指物时，下列情况下只能用that ，不宜用which。
(1)先行词为不定代词，如All、much、anything、everything、nothing、something、none、the one等。
We are willing to do anything that is good to the people.
I have told them all (that) I know.
All that can be done has been done.
(2)先行词是序数词或被序数词、修饰时。
The first book that I read last night was an English novel.
(3)先行词是形容词最高级或被最高级修饰时。
This is one of the most interesting films that I have ever seen.
This is the best that can be done now.
(4)如果有两个或两个以上分别表示人和物的先行词时(先行词既有人又有物)，定语从句的关系代词用which和who都不合适，只能用that。
We know nothing about the doctors and the hospitals that you are talking about.
There are sheep and men that can be seen on the hill.
(5)如果先行词被the only、the very、the last、the same、any、few 、little、no、all 、one of、just修饰时。
This is the only book that can be lent to you.
(6)当主句是以which开头的特殊问句时，关系代词只用that。
Which is the dictionary that he used yesterday ?
D.只物时，下列情况下只能用which，不宜用that。
(1)关系代词放在介词之后
This is the factory in which we once worked.
(2)非限制性定语从句中
This is the book, which is written by Lu Xun.
(3)that，Those作主语时
Those which are on the desk are English books.
E.先行词前有such、the same、as时, 关系代词用as，不用that, 但the same…as…表示同样的, the same…that…表示同一的
He knows as many people as are present at the meeting.
Such people as you refer to are rare nowadays.
三.比较When/which、where /which、why.
which I still never forget.
This is the day when I joined the party.
which he spent reading the books.
where I found the book.
which makes machines.
This is the place which we once visited.
which I will never forget.
which I am looking for.
限制性定语从句与非限制性定语从句的区别：
限制性定语从句
非限制性定语从句
All the students who study hard have passed.学习努力的学生都考试及格了。(只有努力的及格了，不努力的没及格。) All the students ,who study hard have passed.所有的学生都及格了，他们学习努力。(没有人不及格，这些学生都很努力。)
从句是先行词不可缺少的定语(如去掉，主句意思就不完整或不正确。) 从句是对先行词的附加说明(如去掉，主句意思仍清楚，不受影响。) 与主句关系密切，不用逗号 与主句关系不十分密切，用逗号与主句隔开译为汉语时，从句译在先行词前，与先行词用“的”连接 译为汉语时，从句放在主句后面关系代词that可以代替who、whom(指人)、which(指物) 关系代词不用that,只用who、whom(指人)、which(指物) 关系代词代替宾语时可以省略 关系代词不能省略关系代词as和which
先研究下面两个例句：
○1.This elephant is like a snake, as /which everybody can see. =As everybody can see, this elephant is like a snake. 任何人都看得出来，这头象像条蛇。
○2.Tom didn’t pass the physics exam, which made his parents very angry. Tom物理考试不及格，这使得他父亲很生气。
这两个例句中，as和which所代表的都是整个主句所表示的内容。但有两点不同之处：
1. 在形式上as引导的非限制性定语从句可位于主句的后面，也可位于主句的前面;而which引导的非限制性定语从句只能位于主句的后面，不能位于主句的前面。
2. 在意义上，as引导的定语从句和主句的关系一般为一致关系，常译为“正如……”，“就像……”，而which引导的定语从句和主句的关系是因果关系，或which引导的定语从句是对主句的评论。因此，在意思通顺的情况下，which可代替as，而as许多时候不能代替which，如句○2。再如：
1.He was late again, as / which we had expected. =As we had expected, he was late again. 正如我们所料，他又迟到了。/他又迟到了这是我们早就料到的。
2. The street hasn’t been cleared for weeks, which makes it very dirty. 街道好多星期没有打扫了，因此整条街很脏。(不用as)
3.The young man cheated his friend of much money, which was disgraceful. 那年轻人诈骗了他朋友许多钱财，这是不光彩的。(不 用as)
4.He takes exercise everyday, which has done a lot of good to his health. 他每天运动，这对他的身体很有好处。(不用as)
5.As has already been pointed out, English is rather difficult for a foreigner. 正如已经指出的那样，英语对于初学者说，是相当难学的。在such…as…、the same…as…、as…、as many…/much as…等结构中,as不能用which代替。如：
1.Such books as this are too difficult for beginners. 这样的'书对于初学的人来说是太难了。
=Books such as this are …
=Books like this are …
2.I live in the same building as he (does). 我和他住再同一座大楼里。
3.He knows as many people as are present at the meeting. 他认识所有到会的人。
4.That day we all got up early as usual. 那天我们和平时一样，都起得很早。
“One of the +复数名词”后面定语从句中谓语单复数情况
这一结构后面的定语从句的谓语动词通常用复数形式，跟定语从句所*近的那个复数名词在数上保持一致。如：
1. That is one of the books that are required for study at school.
2. This is one of the most wonderful novels that have been published since 1990.
3. She is one of the few persons who know Spanish .
4. This is one of the most famous plays that were written in the thirties,
如果one of +复数名词这一结构前面带有the only、the very之类的限定语，后面定语从句的谓语动词则要用单数形式，这是因为定语从句在意义上修饰的是而不是那个复数名词。如：
1.He is the only one of the teachers who knows French in our school.( 修饰the only one)
He is one of the teachers who know French in our school.( 修饰the teachers)
2.This is the only one of the rooms that is free now. (修饰the only one)
This is one of the rooms that are free now. (修饰rooms)
as与which引导的定语从句
两者均可引导非限制性定语从句，有时可以互换，但下列情况多用as。
1. 关系代词引导的定语从句居句首时。 As we all know, the earth is round.
2. 当与such或the same连用时，一般用as。 Such books as you tell me are interesting. I have the same plan as you.
3. 当从句和主句语义一致时，用as，反之则用which。 She has married again, as was expected. She has married again, which was unexpected.
4. as在从句中作主语时，后面常接行为动词的被动语态，如be known，be said，be reported等，如从句中行为动词是主动语态，一般要用which作主语。
She has been late again, as was expected.
Tom has made great progress, which made us happy.
篇9：定语从句that的用法例句
例句：
1. A miracle is somethingthatseems impossible but happens anyway.
奇迹就是看似不可能，却发生了。
2. If you wait, allthathappens isthatyou get older.
如果你等待，发生的只有变老。
3. When life gets hard and you want to give up, rememberthatlife is full of ups and downs, and without the downs, the ups would mean nothing.
当生活很艰难，你想要放弃的时候，请记住，生活充满了起起落落，如果没有低谷，那站在高处也失去了意义。
4. Eventually, you'll learn to crythaton the inside.
终有一天，你会学会让泪往心里流。
篇10：定语从句的用法讲解
[定语从句的种类]
定语从句分为限制性和非限制性两种。限制性定语从句是句子不可缺少的部分，如去掉主句意思就不完整或失去意义；非限制性定语从句是先行词的附加说明，去掉也不会影响主句的意思。它与主句之间通常用逗号分开，一般不用that引导，关系词不可省略。如：
This is the book that I want to read. （限制性）
Tom’s father， who arrived just now， is a famous scientist. （非限制性）
非限制性定语从句的先行词成分可以是整个主句，非限制性定语从句常用which引导，修饰整个句子。定语从句的谓语动词要用第三人称单数。例如：
The weather turned out to be very good， which was more than we could expect.
关系代词引导的定语从句
关系代词所指代的先行词是表示人或物的名词或代词，并在句中充当主语、宾语、定语等成分。关系代词在定语从句中作主语时，从句谓语动词的人称和数要和先行词保持一致。
在定语从句中，who和that既可作主语又可作宾语，whom只可作宾语（作宾语时可以省略）。如：
Is he the man who/that wants to see you？ （who/that在从句中作主语）
The man （whom/who/that） you spoke to just now is our English teacher. （whom/who/that在从句中作宾语，可省略）
[whose]
在定语从句中作定语，可用来指人或物，表示物时相当于“the+名词+of+which”或“of+which+the+名词”。如：John， whose wife is ill， can’t come to the party.
[which & that]
which和that指代的先行词是表示事物的名词或代词，在定语从句中可作主语、宾语等。如：
Please show me the radio that/which you have just bought. （that/which在从句中作宾语，可省略）
This is the film that/which created a great sensation. （that/which在从句中作主语）
只能用that而不能用which的情况：
1. 先行词是最高级或被最高级修饰时。如：This is the best dictionary that I’ve ever used.
2. 先行词是序数词或被序数词修饰时。如：The first thing that we should do is to get some food.
3. 当先行词是anything， everything， nothing， something， few， all， none， little， some等不定代词时，或是由every， any， all， some， no， little， few， much等词修饰时。如：Tom told his father all that had happened.
There is little that I can do for you.
4. 先行词既有人又有物时。如：They talked about the teachers and the schools that they knew.
5. 先行词被the only，the very，the right等修饰时。如：This is the very book that I want to have.
6. 在which，who，whom引起的问句中，为避免重复。如：Who is the girl that talked to you yesterday？
7. 关系代词在定语从句中作表语时。如：China is not the country that it was.
只能用which，不能用that的情况：
1. 在非限制性定语从句中。如：Beijing， which is the capital of China， has a very long histroy.
2. 在介词后面，即“介词+which（指物）”。如：This is the house in which we lived three years ago.
[as]
关系代词as代替的先行词是人或物的名词， 在从句中作主语、宾语和表语。
as引导限制性定语从句时，常和such， the same， as（so）连用， 构成such ... as， the same ... as， as/so ... as等结构，在从句中可作主语、宾语和表语。如：
Don’t trust such men as praise you to your face. （在定语从句中作主语）
I have the same trouble as you have. （在定语从句作宾语）
It’s as pleasant a film as I have ever seen. （在定语从句作宾语）
但是当先行词被the same修饰时，that也可以引导定语从句，但意义有所不同。the same ... as（指同样或同类的）， the same ... that（指同一个）。例如：
This is the same watch as I lost.
This is the same watch that I lost.
as也可单独使用，引导非限制性定语从句，修饰整个主句或主句中的一部分，放在句首、句中或句末。如：
As is known to us all， smoking is harmful to one’s health. （指代整个主句，在从句中做主语）
He is late， as is often the case. （指代整个主句，在从句中做主语）
Light， as everybody knows， travels much faster than sound. （指代整个主句，在从句中做宾语）
as和which作关系代词的用法比较：
which引导的非限定性定语从句只能放在主句之后，which指代前面的一个句子或主句中的某一成分；as引导的非限定性定语从句能放在主句之前、中、后，既可指前面已经提到的情况，也可指后面提到的情况。
as引导从句时，有“为人所熟知”的含义，which则没有这层意思。as引导的从句往往表示的是一种附加说明，which引导的从句一般是较为重要的陈述。如：
His mother is ill， which makes him very sad.
As is expected， the England team won the football match.
[关系副词引导的定语从句]
关系副词when， where， why可代替的先行词是时间、地点或理由的名词，在从句中作状语， 相当于“介词+which”结构。例如：
I’ll never forget the time when/during which we worked in the factory.
This is the village where /in which he was born.
I don’t know the reason why/for which she looks unhappy today.
[判定用关系代词还是用关系副词]
关系代词与关系副词的选用，应看先行词在定语从句中充当什么成分：若作主语、宾语或定语，则用关系代词who，whom，that，which，whose，as等；若作状语， 就用where， when， why等关系副词。如：
The reason why I’m writing is to tell you about a party on Sunday. （状语）
The reason that/which he gave us sounded reasonable. （宾语）
Pisa is a city， which has a leaning tower. （主语）
Pisa is a city， where there is a leaning tower. （状语）
[介词+关系代词]
当关系代词作介词宾语时，就出现了“介词+关系代词”的结构引导定语从句的现象。当先行词指物时用“介词+which”，指人时用“介词+whom”，且关系代词不能省略。而这种结构中较难解决的问题是介词的选择问题：
1. 介词的确定可以根据整个句意来确定。
Oxygen is a kind of gas， without which we couldn’t live.
2. 介词可以根据与先行词的搭配来确定。
He gave me the book for which he paid a lot of money. （动词与介词搭配）
1949 was the year in which the P.R.C. was founded. （名词与介词搭配）
The snake， of which she used to be afraid， is her favorite animal now. （形容词与介词搭配）
篇11：英语定语从句的用法
1.窗户朝南的那间房间是我的。
The room whose window faces south is mine.=The room of which the window faces south is mine.
1. 整座城市躺在废墟中，其中百分子75的工厂和大楼消失不见了。 The whole city, 75% of whose factories and buildings were gone, lay in ruins.
2. 我们公司有工人，三分之二是女工。
Our company has 2000 workers, of whom two thirds/ two thirds of whom are women.
3. 那些被困在废墟里的人已经得救了。
Those who were trapped under the ruins finally got rescued.
4. 你们刚才谈论的那场地震好可怕呀!
The earthquake that you were talking about sounded frightening/shocking.=The earthquake about which you were talking sounded frightening.
5. 我的家人都是音乐爱好者，今晚将去看电影。
My family, all of whom are music lovers, are going to the movie tonight.
6. 我们正在看的这幢大楼过去曾经是一家医院。
The building which we are looking at used to be a hospital.
7. 约翰向母亲说起过把他在国外见过的人和城市。
John once talked to his mom about the people and cities that he had visited abroad.
8. 他是去过伦敦的一位以观光者之一。
He is one of the tourists who have been to London.
9. 他是这些观光者当中唯一去过伦敦的。
He is the only one of the visitors that/who has been to London.
10. 这就是你们上个礼拜参观过的学校吗?
Is this the school that you visited last Sunday?
11. 这所学校就是你们上个礼拜参观过的那所吗?
Is this school the one that you visited last Sunday?
12. 他们曾经居住过的是在这个地方里。
It is in this place that he once lived.
13. 这是他们曾经住过的地址。
It is the place where he once lived.
14. 他有两个儿子，每一位都看起来像他。
He has two sons, either of whom looks like him.
15. 他有连个儿子，并且每一个都看起来像他。
He has two sons, and either of them looks like him.
16. 这是一本封面是蓝色的书。
17. This is a book whose cover is blue.=This is a book,of which the cover is blue=This is a book,the cover of which is blue.
18. 他不说令她生气的话。He said nothing that made her angry.
19. 那就是他拒绝在会上发言的理由。That was the reason why/for which he refused to speak at the meeting. =That was the reason which/that he refused to speak for at the meeting.
20. 那就是前几天麦克给我的理由。
That was the reason that/which Mac gave me.
21. 正如我们大家都知道的一样，比尔盖茨创建了微软公司。
As is known to us all, Bill Gates founded Microsoft on his own.
22. 比尔盖茨创建了微软公司是我们大家都知道的。
It is known to us all that Bill Gates founded Microsoft on his own.=That Bill Gates founded his own Microsoft is known to us all.
23. 是他那夹杂着乡村音乐，布鲁斯音乐和福音的风格成就了他的名气。你是同谁一起去看的电影?
It is his voice, with his country, blues and Gospel styles, that made him famous. Who was it that you went to the movie together with?=With whom was it that you went to the movie together..
24. 他不像是那种把工作留下一半的那种人。
He isn’t such a man as would leave his work half done.
25. 我要用与你们工厂里用过相同的那种工具。
I prefer to use the same tools as were used in your factory.
26. 我丢了一本书，书名我一时记不起来了。
I have lost a book whose title escapes me at the moment.=I lost a book,of which the title escapes me at the moment.
27. 像你在读的那本小说我不欣赏。
I don’t enjoy such a book as you are reading.=I don’t appreciate the same book as you are reading.
28. 擦黑板的那一位应该受到表扬
The one who cleans the blackboard should be praised.。
29. 我在初中度过的那三年我永远不会忘记。
I will never forget the three years that I spent in the junior middle school
30. 那不是我做事情的方法。
That isn’t the way( in which/that) I do it.
31. 他们能用不同的方法拼写单词，这是你们发现有趣的方法。
They could spell words in different ways which/that you might find interesting.=They could spell words by different means that /which you might find interesting.
32. 照现在的样子抄写这个表达词语，不要有任何更改。
Copy this expression as it is; don’t make any change.
33. 我们将尝试着帮助家长改善他们与孩子交谈的方式。
We will try to help parents improve the ways (that/in which) they talk with their children.
34. 只有用这种方法才会停止比尔盖茨的快速成功。
Only in this way/by this means can Bill Gates’ quick success be stopped.=Only in this way/By this means can they stop Bill Gate‘s quick success。
35. 这位在救援中左脚受伤的士兵，年仅二十岁。、
The soldier whose left foot got wounded during the rescue is only twenty years old.
36. 他们破坏法律的方式开始的时候是和平的。
At first the ways that/in which they broke the laws were peaceful.
篇12：定语从句as的用法课件
(一)、as作连词的用法:
as作连词，常用来连接主句和状语从句。
1.引导时间状语从句，作“当...的时候”解，有“随着...”之意，与while意义相近，强调两个动作同时发生;或某事一发生，另一事立即发生。eg：
He shouted aloud as her ran along.他一边往前跑，一边高声地呼喊。
I was startled as he opened the door.他一开门，我吓了一跳。
as作连词，相当于when。eg;
As a little boy (When he was a little boy)he began to learn to play piano.他小时候就开始学弹钢琴。
2.引导原因状语从句，作“因为，由于”解，与because的用法相近。eg;
I must stop writing now，as I have rather a lot of work to do.我必须停笔了，因为我还有许多工作要做。
3.引导方式状语从句或比较状语从句，作“正如，(如)像”解。例eg：
As in your country，we grow wheat in the north and rice in the south.正如(像)你们国家一样，我们在北方种小麦，在南方种大米。(方式状语从句)
When at Rome，do as Romans do.入乡随俗。(方式状语从句)
4.引导让步状语从句，作“虽然，尽管”解。这时从句常用倒装语序，即把从句中的表语、状语或动词原形放在as之前。eg;
Strange as it may seem，it is true.尽管这事看上去很奇怪，但却是真的。
Try as he might，Tom could not get out of the difficulties.不管怎样努力，汤姆还是摆脱不了困境。
1. 作“在-------期间，当----的时候”引导时间状语从句.注意与 when、while的用法区别。
篇13：定语从句as的用法课件
1.某事一发生，另一事立即发生
As the sun rose the frog dispersed 太阳一出来雾就消散。
They strolled into the garden as the music ceased. 音乐声一停，他们就走进花园。
2.在某事发生的过程中另一事发生
I heard the murmur of their voices as I crossed the hall.
我走过大厅的时候听到他们在嘀咕什么。(两个动作都是一般时态)
Just as he was speaking there was a loud explosion.
正当他在说话的时候，一声巨响。(从句用进行时态)
3. 两个动作同时发生
He smiled as he passed. 他路过的时候笑了一下。
As she sang, the tears ran down her cheeks. 她一边唱歌，眼泪一边从脸颊淌下。
Helen heard the story as she washed. 海伦一边洗衣服一边听故事。
He saw that she was smiling as she read. 他看到她一边看着书一边笑。
(两个都是延续性动作)
We get wiser as we get older. 我们随着年龄的`增长而变得聪明起来。
(随着时间的变化而变化)
①下列情形时,只用as, 而不用when或while。
1) 用于表示同一个人的两种动作交替进行,指一边----一边. 如:
The girl sings as she goes to school.
He looked behind occasionally as he went forward in the forest.
2)表示两个同步发生的动作或行为,意思是随着-----的发展.如:
As time went on / by, she became more and more beautiful .
As children get older, they become more and more interested in everything.
3)表示两个短暂行为或事情几乎同时发生.如:
I watched her as she read the book.
I thought of it just as you opened your mouth.
Just as the flying worm hit her face, she gave a loud cry.
4)接在名词后面表示某一个年龄段时.如:
As a young man, he was active in sports.
②when作“当……的时候”解,可以指较短的(一点)时间,也可指一段时间。如:
When I was at college, I could speak several foreign languages. When the clock struck twelve, I had slept for 2hours.
③while常表示一段较长的时间或一个过程,强调主句谓语动词与从句谓语动词同时发生。如:Work while you work. Play while you play.
2. As =Since 作“既然”、“由于”解,引导原因状语从句,常用来表示已为人们所知或显而易见的原因或理由。如:
As he’s been ill for ages, I will help him.
As / Since you're not feeling well, you may stay at home.
As he wasn't ready , we went without him.
3.As =in the way that作“像”、“按照……的方式”解,引导方式状语从句。如:
Do as I told you.
Remember, you must do everything as I do.
4. 用于as--- as或not / so/ as ---- as中, 前一个as是副词, 后一个as是连词, 引导比较状语从句。如:
They helped the old as much as possible.
I don't speak English so/ as well as she does.
5. 表示虽然, 尽管 等, 引导让步状语从句, 常用倒装语序, 模式为:
adj. /adv. / n.+as +主语+谓语+主句。如:
Young as he is, he knows much.
Tired as they were, they walked on.
6. 表示也------一样。
S he is a doctor, as was her husband.
(二)、as作关系代词,引导定语从句,表示正如,这一点.如:
1. 引导限制性定语从句，用在“such...as”, “the same...as”，“as...as”等结构中，常译作“像...一样的人(或物)”，“凡是...的人(或物)”。
eg： He wished to be such a man as Lei Feng was.他曾希望做一个像雷锋那样的人。
My hometown is no longer the same as it was.我的家乡再也不像过去一样了。
2.引导非限制性定语从句，用来指代它前面的整个句子(即先行句)，意思是“这一点”。这个分句可以位于句首、句中或句末。
eg：As is well known，oceans cover more than 70% of the earth.
我们知道，海洋占地球面积的百分之七十以上。
He is very careful, as we all know.
As is well-known, belongs to China.
另外,当先行词被the same, such等词修饰时,常用as来引导定语从句。如:
Such a clever girl as she can learn anything quickly.
I was reading the same book as he bought yesterday.
(三)、as作介词的用法.
1. 作“如，像”解,表示好像。如:He dressed as a policeman.
They got united as one man.他们团结得像一个人一样。
2. 作“充当，作为”解,表示作为, 当作。如：I found a job as a guide.
As a writer，he was famous.作为作家，他是很有名的。
3.当某人是某身份时。如：As a child , she was sent to abroad.
4.as引导的介词短语大多用作状语,as译为“作为”;少数情况可引起宾语补足语。如:
As a Party member, I'll take the lead in everything. (状语)
She works as a model. (状语)
She has me as one of her best friends.(引起宾语补足语)
(四)、作副词的用法
as作副词，表示程度，意为“同样地”。在“as...as...”，“not as...as...”结构中的第一个as是副词，作“和/与...(不)一样”解。
e.g. Jack is as tall as his father.杰克和他的父亲一样高。
He doesn't speak English as/so fluently as you.他的英语说得不如你流利
1 表示与------等同。
如：This dress is twice as expensive as that one.
2 像，如等。
如：As before, he remained unmoved.
五)含as的固定词组的用法
1. as soon as作“一…就”解，引导时间状语从句。
eg：As soon as I get to Beijing，I'll write to you.我一到北京，就给你写信。
2.as/so long as作“只要”解，
e.g. As/So long as you study hard，you'll make progress.只要你努力，你就会取得进步。
2. as if/though常用来引导方式状语从句，作“好像，仿佛”解。如果从句中讲的是非真实情况，则用虚拟语气。
e.g. She loves the child as if/though he were her own.
她爱这个孩子如同爱自己的孩子。
3. As if/though也可用来引导表语从句，常用在“It appears/looks/seems...+as if/though”句型结构中。
e.g. It appears as if/though it is going to clear up.看起来天要晴了。
It seems as if/though he knew nothing about it.他好像对此事一无所知。4.as to作“关于，至于”解。
e.g. There is no doubt as to his honesty.他的诚实是无可置疑的。
5.as much/many as作“多达...”，“达到...之多”解。
e.g：He can earn as much as 5000 dollars a month.他每月能挣5000美元。
6.so/as far as I know作“就我所知”解，在句中作插入语。
eg： As/So far as I know，he will come here next Monday.
据我所知，他将于下星期一到这里来。
7.as a result，as a result of表示“由于...的结果”。
e.g. She died as a direct result of the accident.她的死是那次事故的直接结果。
8，as well为“也，还”之意。
e.g. Come early，and bring your brother as well.早点来，把你的弟弟也带来。
9.so as to，so...as to若跟动词原形，表示目的或结果。
eg：He studied hard so as to pass the exam.他努力学习以便通过考试。(表示目的)
篇14：定语从句几句话总结
定语从句(Attributive Clauses)在句中做定语，修饰一个名词或代词，有时也可以修饰部分或整个句子。
被修饰的名词，词组或代词即先行词。定语从句通常出现在先行词之后，由关系词(关系代词或关系副词)引出。
关系代词有：who, whom, whose, that, which, as。
关系副词有：when, where, why, how。
关系代词和关系副词放在先行词和定语从句之间，起连接作用，同时又可做定语从句的一个成分。当关系代词做宾语时可以省略。
定语从句中的谓语动词必须在人称上和数量上和先行词保持一致。
定语从句分为限制性定语从句和非限制性定语从句。
1
关系代词引导的定语从句
1) who, whom, that 这些词代替的先行词是人的名词或代词，在从句中所起作用如下：
Is he the man who/that wants to see you?
(who/that在从句中作主语)
He is the man whom/ that I saw yesterday.
(whom/that在从句中作宾语)
2) whose 用来指人或物，(只用作定语，若指物，它还可以同of which互换).
例如：
Please pass me the book whose (of which) cover is green.
3) which, that 它们所代替的先行词是事物的名词或代词，在从句中可作主语、宾语等.
例如：
A prosperity which / that had never been seen before appears in the countryside.
(which / that在句中作宾语)
The package (which / that) you are carrying is about to come unwrapped.
(which / that在句中作宾语)
关系代词that和which 都可以指物，that 和Who 都可以指人，其用法区别：
不用that的情况：
a) 在引导非限定性定语从句时
(错)The tree, that is four hundred years old, is very famous here.
b) 介词后不能用
We depend on the land from which we get our food.
c) 多用who 的情况
①关系代词在从句中做主语
A friend who helps you in time of need is a real friend.
②先行词为those, people 时
Those who were either fools or unfit for their offices could not see the cloth.
③先行词为all, anyone, ones, one 指人时
One who doesnt work hard will never succeed in his work.
④在There be句型中There is a stranger who wants to see you.
⑤在被分隔的定语从句中
A new teacher will come tomorrow who will teach you German.
⑥在有两个定语从句的句子中，其一用who，其二用that,但若先行词后接两个以上的并列定语从句时，后一个必须重复前一个关系代词。
The student who was praised at the meeting is the monitor that is very modest and studies very hard.
There is a teacher who is always ready to help others and who enjoys what he does.
只能用that作为定语从句的`关系代词的情况
a)在不定代词，如：anything, nothing, everything, all, much, few, any, little等作先行词时，只用that，不用which。
All that is needed is a supply of oil.
Finally, the thief handed everything that he had stolen to the police.
b)先行词有the only, the very, the just修饰时，只用that。
He is the very man that helped the girl out of the water.
c)先行词为序数词(the last)、数词、形容词最高级时，只用that。
The first English book that I read was The Prince and the Pauper by Mark Twin.
d)先行词既有人，又有物时。
He talked about the teachers and schools that he visited.
e)当主句是以who 或which 开始的特殊疑问句时，用that 以避免重复。
Who is the person that is standing at the gate.
f)关系代词在从句中做表语
He is not the man that he used to be.
3
关系副词引导的定语从句
关系副词可代替的先行词是时间、地点、方式或理由的名词，在从句中作状语。
关系副词when, where, why, how的含义相当于介词+ which结构，因此常常和介词+ which结构交替使用.
例如：
There are occasions when (on which) one must yield.
Beijing is the place where (in which) I was born.
Is this the reason why (for which) he refused our offer?
Im surprised the way how (by which) he works out the problem.
注意：
①在非限制性定语从句中，介词+ which结构不能代替关系副词。
如：They set up a state for their own , where they would be free to keep Negroes as slaves.
②含有介词短语的动词一般不能拆开，介词仍放在动词后面。
Is this the book which (that) she was looking for?
3
名词/数词/代词 /形容词最高级 + 介词 + 关系代词引导定语从句
She has written a book , the name of which I have forgotten.
There are fifty-five students in our class , all of whom are working hard.
There are five continents in the world , the largest of which is Asia.
4
as, which 引导非限定性定语从句的差别
由as, which 引导的非限定性定语从句，as和which可代整个主句，相当于and this或and that。As一般放在句首，which在句中。
As we know, smoking is harmful to ones health.
The sun heats the earth, which is very important to us.
as可引导非限制性从句，常带有正如的意思。
As is know, smoking is harmful to ones health.
用法区别：
(1) as 引导的定语从句可置于句首，而which不可。
As we all know, he never smokes.
(2) as 代表前面的整个主句并在从句中作主语时，从句中的谓语必须是系动词;若为行为动词，则从句中的关系代词只能用which。
(3)非限定性定语从句中出现expect, think, suppose 等表示猜测、想象、预料等时。
She succeeded in her doing the research work , as we expected.
(4)As 的用法 the same? as; such?as 中的as 是一种固定结构, 和??一样??。
I should like to use the same tool as is used here.
We should have such a dictionary as he is using.
★ 定语从句教案
★ 英语定语从句总结
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