宾语从句if 和whether的用法区别

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宾语从句if 和whether的用法区别

篇1:宾语从句if 和whether的用法区别

if和whether用法:

一、if和whether都可译为“是否”,二者引导宾语从句时通常可以互相替换,口语中多用if代替whether。例如:Ask if/whether he plans to come to the meeting. 而以下几种情况中, 只能用whether:

1、强调两方面的选择,特别是句中有or not时。如: Let me know whether you can come or not.

2、宾语从句前置时。如: Whether this is true, I can't say.

3、引导主语、表语、同位语从句时。如: Whether the football game will be played depends on the weather. (主语从句)

The question is whether he can do it. (表语从句)

The question whether we should go with them must be decided at once. (同位语从句)

4、在介词之后作介词的宾语时。如: I haven't settled the question of whether I'll go back home.

5、在不定式前与不定式一起组成词组时。如: Whether to go or stay is still a question.

6、在discuss, decide 等动词后作宾语时。如: We discussed whether we should go there by plane.

二、if或whether引导宾语从句时,作“是否”讲,常放在动词ask 、see 、say 、know和find out等后面。一般情况下,两者常可换用,在口语中多用if。如:

例1 Nobody knows whether (if) it will rain tomorrow. 没有人知道明天是否下雨。

例2 Lucy asked whether (if) they had a cotton sweater .露西问他们是否有棉制的羊毛衣。

三、if或whether引导宾语从句时,要注意三个方面,即连词、语序和时态。

1、if或whether不能和that 或其它连词(副词)同时使用,也不能省去。如:

例3我不知道他今天是否会来。

[误] I don’t know that if(whether) he will come here today .

[正] I don’t know if(whether) he will come here today .

例4他走过来看看猫是否出了毛病。

[误] He came to see what if (whether) there was wrong with his cat .

[正] He came to see if (whether) there was wrong with his cat .

2、if或whether引导的宾语从句时,虽具有疑问意义,但从句语序应用陈述句语序。如:

例5 Did you know the way to the hospital ? The old woman asked me .

The old woman asked me .if (whether) I knew the way to the hospital .老妇人问我是否知道去医院的路。

3、if或whether引导的宾语从句应和主句的时态保持一致。即主句为一般现在时,从句用任一种时态;主句为一般过去时,从句则用过去时中的`任一种时态。如:

例6 I don’t know if (whether) he has come here . 我不知道他是否来过这儿。

例7 Tom asked if (whether) I had read the book . 汤姆问我是否看过这本书 。

四、if和whether的区别:

1、在动词不定式之前只能用whether 。如:

例8 I can’t decide whether to stay. 我不能决定是否留下。

2、在whether …… or not 的固定搭配中。如:

例9 I want to know whether it’s good news or not . 我想知道是否是好消息。

3、在介词后,只能用whether。如:

例10 His father is worried about whether he lose his work . 他的父亲担心是否会失去工作。

4、宾语从句放在句首表示强调时,只能用whether 。如:

例11 Whether they can finish the work on time is still a problem . 他们是否能准时完成这项工作还是个问题。

5、用if会引起歧义时,只用whether。如:

例12 Could you tell me if you know the answer ?

这句话有两种意思:“你能告诉我是否知道答案吗?”或“如果你知道答案,请告诉我,好吗?”。如用whether可避免歧义。

篇2:宾语从句if 和whether 的用法区别

if和whether都可译为“是否”,二者引导宾语从句时通常可以互相替换,口语中多用if代替whether。

强调两方面的选择,特别是句中有or not时。

if或whether引导宾语从句时,作“是否”讲,常放在动词ask 、see 、say 、know和find out等后面。一般情况下,两者常可换用,在口语中多用if。

if或whether引导宾语从句时,要注意三个方面,即连词、语序和时态。

篇3:宾语从句的用法

一、宾语从句的连接词

从属连词

连接宾语从句的从属连词主要有that,if,whether.

that引导表示陈述句的宾语从句,而if和whether引导表示“是否”的宾语从句.

He told me that he would go to the college the next year

他告诉我他明年上大学.

I don’t know if there will be a bus any more.

我不知道是否还会有公交车.

Nobody knew whether he could pass the exam.

没人知道他是否会通过考试.

连接代词

连接代词主要有who, whom ,whose ,what ,whoever ,whomever ,whosever, whatever, whichever等.

连接代词一般指疑问,但what, whatever除了指疑问外,也可以指陈述.

Do you know who has won Red Alert game?

你知道是谁赢得了红色警报的游戏?

The book will show you what the best CEOs know.

这本书会告诉你最好的执行总裁该了解些什么.

Have you determined whichever you should buy,a Motorola or Nokia cell phone?

你决定好是买诺基亚还是摩托罗拉的电话了吗?

连接副词

连接副词主要有when,where,why,how,whenever,wherever,however等.

He didn’t tell me when we should meet again.

他没有告诉我什么时候我们能再见面.

Could you please tell me how you read the new panel?

你能告诉我怎么用这个新的操作盘吗?

None of us knows where these new parts can be bought.

没有人知道这些的新的零件能在哪里买到.

二、动词的宾语从句

大多数动词都可以带宾语从句

We all expect that they will win , for members of their team are stronger.

我们都预料他们会赢,因为他们的队员更强壮.

He told us that they would help us though the whole work.

他告诉我们在整个工作中,他都会帮忙的.

部分“动词+副词”结构也可以带宾语从句

I have found out that all the tickets for the concert have been sold out.

我发现这场音乐会的所有票都卖光了.

Can you work out how much we will spend during the trip?

你能计算出这次旅行我们将花费多少钱吗?

动词短语也可以带宾语从句

常见的这些词有:

make sure确保 make up one’s mind下决心 keep in mind牢记

Make sure that there are no mistakes in your papers before you turn them in.

在上交试卷前确保没有任何错误.

可运用形式宾语it代替的宾语从句

①动词find,feel,consider,make,believe等后面有宾语补足语的时候,则需要用it做形式宾语而将that宾语从句后置.

I think it necessary that we take plenty of hot water every day .

我认为每天多喝开水是有必要的.

I feel it a pity that I haven’t been to the get-together.

我没去聚会,感觉非常遗憾.

I have made it a rule that I keep diaries.

我每天写日记成了习惯.

We all find it important that we (should) make a quick decision about this mater.

我们都认为对这件事马上做出决定很重要.

②有些动词带宾语从句时需要在宾语与从句前加it

这类动词主要有:hate, take , owe, have, see to.

I hate it when they with their mouths full of food.

我讨厌他们满嘴食物时说话.

He will have it that our plan is really practical.

他会认为我们的计划确实可行.

We take it that you will agree with us.

我们认为你会同意我们的.

When you start the engine, you must see to it that car is in neutral.

开启发动机时, 一定要使汽车的离合器处于空挡位置.

③若宾语从句是wh-类,则不可用it代替

We all consider what you said to be unbelievable.

我们都认为你所说的是不可信的.

We discovered what we had learned to be valuable.

我们发现我们所学到的东西都是有用的.

三、介词的宾语从句

用wh-类的介词宾语从句

We are talking about whether we admit students into our club.

我们正在讨论是否让学生加入我们的俱乐部.

The new book is about how Shenzhou 6 manned spaceship was sent up into space.

这本新书是关于神州6号载人航天飞船是如何升入太空的.

用that,if引导的介词宾语从句

有时候except,but,besides三个介词后可见到that引导的宾语从句

I know nothing about my new neighbor except that he used to work with a company.

对于我的新邻居我只知道他曾在一家公司上班,其他一无所知.

四、形容词的宾语从句

常用来引导宾语从句的形容词有: sure,certain,glad,please,happy,sorry,afraid,satisfied,surprised

I am sure I will pass the exam.

我确信我会通过考试.

I am sorry that I have troubled you so long.

很抱歉我这么长时间在打扰你.

He is glad that Li Ming went to see him when he was ill.

他很高兴在他生病的时候李明能去看望他.

五、if,whether在宾语从句中的区别

① if和whether在作“是否”解时,引导宾语从句常放在动词know,ask,care,wonder,find out等之后,介词后一般不用if

② 少数动词,如:leave,put,discuss,doubt后的宾语从句常用whether.

③ whether后可以加or not,但是if不可以.

④ 在不定式前只能用whether.

(如:I can’t decide whether to stay. 我不能决定是否留下。)

⑤ 避免歧异时,我们常用whether而不用if.

六、哪些宾语从句不可以省略引导词that

当that作learn,suggest,explain,agree,wonder,prove,mean,state,feel,hold等动词的宾语时;

当宾语从句较长时;

当主语状语置于主句尾,宾语从句之前时;

当主语谓语动词(包括非谓语动词)与宾语从句之间有插入语时;

当一个动词带有两个或两个以上宾语从句时,此时第一个that可以省略,第二个that不可以省略;

当宾语从句中的主语是this,that或this,that做主语的定语时;

当宾语从句是双宾语中的直接宾语时;

当宾语从句的主语是非谓语动词或主语从句时;

当主语中的谓语动词是固定词组时;

当宾语从句有it做其先行词时;

在直接引语中,转述分句把宾语从句隔开时.

七、宾语从句的否定转移

主句的谓语动词是think,believe,imagine,suppose,consider,espect,fancy,guess等,并且主句的主语是第一人称而且为一般现在时,从句的否定词一般要转移到主句上来,其反义疑问句一般与宾语从句一致.

I don’t think he will come to my party.而不能说成I think he won’t come to my party.

我认为他不会来我的舞会.

I don’t believe that man is killed by Jim,is he?

我认为那个人不是Jim所杀的,是不是?

如果宾语从句中有某个含有否定意义的形容词或副词,其反义疑问句要用肯定形式.

We find that he never listens to the teacher carefully,does he?

我们发现他从来不仔细听老师讲课,是不是?

八、宾语从句的时态和语序

当主句为现在时或将来时,宾语从句的时态一般不受主句的时态所影响.

当主句为过去时

①从句用一般过去时或过去进行时表示与主句谓语动词动作同时发生

I only knew he was studying in a western country,but I didn’t know what country he was in.

我只知道他当时在西方的一个国家读书,可不知道是哪个国家.

He asked me if I was reading the story The Old Man and the Sea when he was in.

他问我他进来的时候我是否正在读<<老人与海>>.

②从句过去完成时表示该动作发生在主句谓语动作之前

He told me that he had told Mary about the meeting already.

他告诉我他已经把有关会议的事情告诉的了Mary.

③从句谓语用过去将来时表示该动作发生在主句谓语动作之后

The reporter asked if the government would take necessary measures to put down the to-do.

记者问政府是否会采取必要的措施镇压骚乱.

如果从句是一个客观真理,那么从句的时态不根据主句的时态而变化

The teacher said that the moon goes around the earth yesterday.

老师昨天说月亮绕着地球转.

当宾语从句的引导词是who,which,what,when,where,how,why等表疑问时,不能按正常语序安排,经常将这类引导词置于句首

Who do you think the public might choose as their favorite singer this year?

你认为今年公众会选谁为他们最喜欢的歌手.

篇4:宾语从句用法总结

that引导表示陈述句的'宾语从句,if和whether,whether...or not引导表示“是否”的一般疑问句的宾语从句。

连接代词

连接代词主要有who,whom,whose,what,whoever,whomever,whosever,whatever,whichever等。

连接代词一般指疑问,但what,whatever除了指疑问外,也可以指陈述。

连接副词

连接副词主要有when,where,why,how,whenever,wherever,however等。

篇5:宾语从句的常用用法

通常引导陈述句的.引导词是“that”。

引导一般疑问句的引导词是“if”和“whether”。

引导特殊疑问句的引导词则是众多的特殊疑问代词或疑问副词, what who when 等。

Eg: He asked me if (whether) I was a teacher.

直接引语变成宾语从句。

直接引语:直接引用别人说的话。

间接引语:转达别人说的话。

直接引语变成宾语从句,如果冒号,引号里是陈述句形式,要用“that”引导,同时从句中的人称,时态,指示代词,地点状语等都要发生相应的变化。

篇6:if 和whether的用法区别

if用法:

用法1:引导条件状语从句:

一、if作为连词,引导条件状语从句,它表示的`意思是“假如”“如果”等。在复合句中如果主句用将来时,则if引导的状语从句用一般现在时。

用法2:引导让步状语从句:

二、if还可以引导让步状语从句。这时if当作“即使是”“虽说”解。例

if句型的用法3:引导时间状语从句:

三、if引导时间状语从句,当if做“当”或“无论何时”解而不含有条件之义时,if从句中的时态与主句中的时态相同。

Whether用法:

whether可以用作连词:

whether用作连词,意思是“是否,是不是”,可引导名词从句或动词不定式短语。

whether还可引导让步状语从句,意思是“不管,无论”,从句中通常用一般现代时代替将来时。

篇7:宾语从句的用法及练习题

一、宾语从句的用法

在复合句中作主句的宾语,引导词有:

连词:that (that 常可省略),whether, if

代词:who, whose, what ,which

副词:when ,where, how, why 等。

(一)that引导的宾语从句(在非正式场合that可以省略)

可跟that从句做宾语的动词有:

say, think, insist, wish, hope, demand, imagine, wonder, know, suppose, see, believe, agree, admit, deny, expect, explain, order, command, feel, dream, suggest, hear, mean, notice, prefer, request, require, propose, declare, report等。

例句:The boy believes that he will travel through space to other planets.

注意事项:当主句谓语动词是 think, believe, suppose, expect 等词,而宾语从句的意思是否定时,常把否定转移至主句表示。

例句:I don’t think it is right for him to treat you like that.

在以下情况中that不能省略

当句中的动词后接多于两个由that引导的宾语从句时,第一个that可省,但后面的that不可省。

例句:He said (that) you were too young to understand the matter and that he was asked not to tell you.

当主句的谓语动词与that宾语从句之间有插入语时,that一般不可省。

例句:Just then I noticed, for the first time, that our master was wearing his fine green coat and his black silk cap.

当that从句是双宾语中的直接宾语时,that不可省。

例句:I can’t tell him that his mother died.

注意事项:许多带复合宾语的句子,that引导的宾语从句经常移到句子后部,而用it作形式宾语。

例句:I find it necessary that we should do the homework on time.

(二)由whether,if 引导的宾语从句

由whether(if)引导的宾语从句,实际上是一般疑问句演变而来的。意思是“是否”。宾语从句要用陈述句语序。一般说来,在宾语从句中whether与if可以互换使用,但在特殊情况下if与whether是不能互换的。

例句:I wonder whether(if) they will come to our party.

只能用whether,不能用if引导的宾语从句

在带to的不定式前

例句:We decided whether to walk there.

在介词的后面

例句:I’m thinking of whether we should go to see the film.

在动词后面的宾语从句时

例句:We discussed whether we had a sports meeting next week

直接与or not连用时

例句:I can’t say whether or not thet can come on time.

只能用if不能用whether引导的宾语从句

if引导条件状语从句,意为“如果”

例句:The students will go on a picnic if it is sunny.

if引导否定概念的宾语从句时

例句:He asked if I didn’t come to school yesterday.

引导状语从句even if(即使)和as if(好象)时

例句:He talks as if he has known all about it.

(三)连接代词和连接副词引导的宾语从句

这样的宾语从句实际上是由特殊疑问句变化而来的,宾语从句要用陈述句语序。用于这种结构的动词常常是:see, say, tell, ask, answer, know, decide, show, find out, imagine, suggest, doubt, wonder, discover, understand, inform, advise等。

英语中的连接代词有:who,whom,whose,which,what,在句中担任主语、宾语、定语或者表语。

例句:Can you tell me whom you are waiting for?

英语中的连接副词有:when,where,why,how,在句中担任状语的成分。

例句:None of us knows where these new parts can be bought.

二、练习题

( ) 1. What did Mike say? He said ____________________.

A. if you are free the next week B. what colour was itC. the weather is fine D. summer comes after spring

( ) 2. Tom asked my friend ________________.

A. where was he from B. that the earth is bigger than the moonC. when did he come back D. not to be so angry

( ) 3. Let me tell you __________________.

A. how much is the car B. how much does the car cost C. how much did I pay for the car D. how much I spent on the car

( ) 4. Peter knew_______.A. whether he has finished reading the book B. why the boy had so many questions

C. there were 12 months in a year D. when they will leave for Paris

( )5. Could you tell me ___________?

A. where do you live B. who you are waiting for C. who were you waiting for D. where you live in

( )6. I can't understand ____the boy alone. A. why she left B. why did she leave C. why she had leftD. why had she left

( )7. She told me the sun ______ in the east. A. rise B. rose C. rises D. had risen

( )8.I don't know ________ up so early last Sunday.A. why did he get B.why he gets C.why does he get D. why he got

( )9. The manager came up to see _________

A. what was the matter B. what the matter was C. what the matter is D. what's the matter

( )10. He asked his father ___. A. where it happens B. where did it happen C. how it happened D. how did it happen

( )11. No one tells us______, so we need your help.

A. how we should do B. what should we do C. how to do it D. what to do it

( )12. Could you please teach me _______ the computer.

A. how check B. to check C. how to check D. to how checking

( )13.They don't know _______their parents are. A that B what C why D which

( )14. ─Where do you think ______ he _____ the TV set? ─ Sorry, I've no idea.

A./, bought B. has, bought C. did, buy D. did bought

( ) 15. Our homework has changed a lot. Who can tell _____ it would be like in _____ five years.

A. how, another B. what, more C. how ,other D. what, another

篇8:简化宾语从句常见用法

方法一:当主句谓语动词是hope, decide, wish, choose, agree, promise等,且宾语从句的主语与主句主语一致时,宾语从句可简化为不定式结构。

例如:

Li Ming hopes he will be back very soon. →Li Ming hopes to be back very soon.

We decided that we would help him. →We decided to help him.

方法二:当主句谓语动词是know, learn, remember, forget, tell等动词,且主句主语与从句主语一致时,宾语从句可简化为“疑问词+不定式”结构。

例如:

She has forgotten how she can open the window. →She has forgotten how to open the window.

注:当主句谓语动词是tell, ask, show, teach等动词,且后带双宾语,从句主语和间接宾语一致时,宾语从句可简化为“疑问词+不定式”结构。

例如:

Could you tell me how I can get to the station? →Could you tell me how to get to the station?

方法三:当主句的谓语动词是order(命令),require(需要)等时,如果主句和从句的主语不一致,宾语从句可简化为“名词(代词)+不定式”结构。

例如:

The headmaster ordered that we should start at once. → The headmaster ordered us to start at once.

方法四:某些动词后的宾语从句,可以用介词加动名词(短语)等其他形式简化。

例如:

He insisted that he should go with us. →He insisted on going with us.

The poor boy doesn't know when and where he was born. →The poor boy doesn't know the time and the place of his birth.

方法五:某些动词后面的宾语从句可转化为“宾语+V-ing形式(作宾语补足语)”结构。

例如:

Liu Ping found that there was a wallet lying on the ground. → Liu Ping found a wallet lying on the ground.

方法六:动词seem后的宾语从句,也可以用不定式(短语)来简化,但句型需要进行适当的变化。

例如:

It seemed that the boys were going to win. →The boys seemed to win.

除上述方法外,还有一些特殊句式的转化。

例如:

I found that it was difficult to learn English well. →I found it difficult to learn English well.

Soon we found that the ground was covered with thick snow. →Soon we found the ground covered with thick snow.

They found that the box was very heavy. →They found the box very heavy.

篇9:宾语从句的用法详解

在句子中起宾语作用的从句叫做宾语从句。宾语从句分为三类:动词的宾语从句,介词的宾语从句和形容词的宾语从句。宾语从句过“三关”:时态、语序、连词

一.宾语从句的定义

置于动词、介词等词性后面起宾语作用的从句叫宾语从句。宾语从句的语序必须是陈述语序。谓语动词、介词、动词不定式,v.-ing形式后面都能带宾语从句。有些形容词(afraid,sure,glad等)之后也可以带宾语从句。

二.宾语从句中引导词的用法在复合句中作主句的宾语,引导词有:

连词:that (that 常可省略),whether, if

代词:who, whose, what ,which

副词:when ,where, how, why 等。

(一)that引导的宾语从句(在非正式场合that可以省略)

可跟that从句做宾语的动词有:

say, think, insist, wish, hope, demand, imagine, wonder, know, suppose, see, believe, agree, admit, deny, expect, explain, order, command, feel, dream, suggest, hear, mean, notice, prefer, request, require, propose, declare, report等。

例句:The boy believes that he will travel through space to other planets.

注意事项:当主句谓语动词是 think, believe, suppose, expect 等词,而宾语从句的意思是否定时,常把否定转移至主句表示。

例句:I don’t think it is right for him to treat you like that.

在以下情况中that不能省略

当句中的动词后接多于两个由that引导的宾语从句时,第一个that可省,但后面的that不可省。

例句:He said (that) you were too young to understand the matter and that he was asked not to tell you.

当主句的谓语动词与that宾语从句之间有插入语时,that一般不可省。

例句:Just then I noticed, for the first time, that our master was wearing his fine green coat and his black silk cap.

当that从句是双宾语中的直接宾语时,that不可省。

例句:I can’t tell him that his mother died.

注意事项:许多带复合宾语的句子,that引导的宾语从句经常移到句子后部,而用it作形式宾语。

例句:I find it necessary that we should do the homework on time.

(二)由whether,if 引导的宾语从句

由whether(if)引导的宾语从句,实际上是一般疑问句演变而来的。意思是“是否”。宾语从句要用陈述句语序。一般说来,在宾语从句中whether与if可以互换使用,但在特殊情况下if与whether是不能互换的。

例句:I wonder whether(if) they will come to our party.

只能用whether,不能用if引导的宾语从句

在带to的不定式前

例句:We decided whether to walk there.

在介词的后面

例句:I’m thinking of whether we should go to see the film.

在动词后面的宾语从句时

例句:We discussed whether we had a sports meeting next week

直接与or not连用时

例句:I can’t say whether or not thet can come on time.

只能用if不能用whether引导的宾语从句

if引导条件状语从句,意为“如果”

例句:The students will go on a picnic if it is sunny.

if引导否定概念的宾语从句时

例句:He asked if I didn’t come to school yesterday.

引导状语从句even if(即使)和as if(好象)时

例句:He talks as if he has known all about it.

(三)连接代词和连接副词引导的宾语从句

这样的宾语从句实际上是由特殊疑问句变化而来的,宾语从句要用陈述句语序。用于这种结构的动词常常是:see, say, tell, ask, answer, know, decide, show, find out, imagine, suggest, doubt, wonder, discover, understand, inform, advise等。

英语中的连接代词有:who,whom,whose,which,what,在句中担任主语、宾语、定语或者表语。

例句:Can you tell me whom you are waiting for?

英语中的连接副词有:when,where,why,how,在句中担任状语的成分。

例句:None of us knows where these new parts can be bought.

三.宾语从句的语序宾语从句的语序是陈述句语序即:连接代词/副词+主语+谓语+其他成分。例句如下:

I don’t know what they are looking for.

Could you tell me when the train will leave?

Can you imagine what kind of man he is?

四.宾语从句的时态主句是一般现在时,从句根据实际情况使用任何时态。

例句:The headmaster hopes everything goes well.

主句是过去时态,从句须用过去时态的某种形式。

例句:She was sorry that she hadn’t finished her work on time.

当宾语从句表示的是一个客观真理或者事实时,即使主句是过去时,从句也用一般现在时态。

例句:The teacher told his class that light travels faster than sound.

五.宾语从句的特点宾语从句可以作及物动词、介词及形容词的宾语。

宾语从句的语序一律用陈述句语序。

连接词that引导宾语从句在句中无词义,不充当句子成份,多数情况下可以省略。

whether 和 if 都可引导宾语从句,但 whether后可紧跟or not;whether从句可作介词的宾语。

如果从句太长,可以用形式宾语it.

名词性宾语从句语法讲解

英语中名词性表语从句介绍

高考英语名词性从句练习

英语名词性从句易混点区分

高中英语语法的知识点

新概念英语第一册语法知识点:宾语从句

优秀英语语法课件

表语从句英语教案

初中英语作文连词

It 句型 (人教版高三英语下册教学论文)

宾语从句if 和whether的用法区别
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