since的用法总结

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since的用法总结

篇1:since的用法总结

(表示时间)从…以来; 自从…之后

I have lived here since January.

自一月份以来, 我一直住在这里。

He had seen her only once since the meeting.

自从那次会议以来, 他只见过她一次。

He's been working in a bank since leaving school.

自从毕业后, 他就一直在一家银行工作。

I have not seen him since then.

从那以后我再也没见过他。

从过去某时间以来[以后, 到现在]

He disappeared many years since.

他多年以前就不知去向。

Her husband died 10 years ago but she has since remarried.

她丈夫于十年前去世, 但她后来又嫁人了。

I've long since forgotten what our quarrel was about.

我早就忘掉我们为什么吵架了。

It was not long since that I returned.

我是在不久前回来的。

He came to London 3 years ago and has lived here ever since.

他三年前来到伦敦, 此后就一直住在这里。

自从(过去某事)以来[以后, 到现在]

Since I left college, I have not seen him.

自从我离开大学以后, 就没有见过他了。

They have never been to see me since I was ill.

自从我生病之后, 他们一直没来看过我。

Since I have owned a bicycle, I have gone to school by it every day.

自从我有了一辆自行车后, 我每天骑车上学。

因为; 既然; 由于

Since it is late I shall go home now.

由于时间晚了, 我现在要回家了。

Since you are so sure of it he'll believe you.

既然你对此这么有把握, 他会相信你的。

篇2:since的用法总结

1. He has ____ the army for ten years and now is an officer.

A.gone into

B.joined in

C.been in

D.come into

答案:C.(其余三组动词均为瞬间动词,不能和段时间连用。)

2. You don't have to describe her. I _____ her several times.

A.had met

B.have met

C.met

D.meet

答案:B.

I _____ on the door for ten minutes now without an answer.

A.was knocking

B.am knocking

C.knocking

D.have been knocking.

答案:D。 因为该句是说到目前为止已经敲了10分钟了,但没人应答。动作一直持续十分钟。因此完成进行时态是最合适的。

for和since的用法区别

1,Since +时间点,具体时间

“自从、、、、以来,从、、、以后” 用来说明动作起始时间

I have been in Beijing since .

2,For + 时间段,用来说明动作延续时间长度,因此句中的谓语动词,也应该是延续性动词。

I have been in Beijing for one year。

We have learnt English for about three years.

I have been here for 3 days. (对)

I have arrived here for 3 days.(误)

for和since的用法例句

例句比较

he has been dead for three years

he has been dead since three years ago

He has studied English since

He has studied English since he was ten years old

for和since的用法练习题

用since和for填空

1) ______ two years2) _______ two years ago3) _______ last month

4) ______ 5) _______ yesterday6) _______ 4 o’clock

7) ______ 4 hours8) _______ an hour ago9) _______ we were children

10) _____ lunch time11) ______ she left here

12). He has lived in Nanjing ________ the year before last.

13). I’ve known him __________ we were children.

14). Our teacher has studied Japanese _________ three years.

15). She has been away from the city ___________ about ten years.

16). It’s about ten years __________ she left the city.

选择题

1. Three years ________since I ________ you last time.

A. have passed; metB. has passed; metC. passed; have met

2. He has been here _______ he left his hometown.

A. since B. in C. for

3. —He ________the English-Chinese dictionary for about twenty years,but it is still new.

—What a careful man!

A. has bought B. has borrowed C. has had

4. ---When did China _____ the WTO?---China _____ the WTO for several years.

A. join; has been a member of B. join; has joined C. take part in; have been in

5. How long have you _____ the book?

A. bought B. borrowed C. kept

6. How time flies! Several years _______ since we started our middle school life. We will keep the pleasant experiences in our minds.

A. have passed B. has passed C.will pass

7. Mr Fan _____ this bike in . He ______ it for 10 years.

A.bought, has bought B.has bought, has had C. bought, has had

8. He ___ in our school for 20 years and he ___ here in 1977. ?A. has taught; came B. has taught; has come C. taught; came D. has teached; has came

9.They are late. The film ___ for five minutes. ?A. has begun B. has started C. has been on D. began

10.We have been friends since _____.

A. five years B.five years ago C. five years before

篇3:since的用法总结

1.ever since 的结构:(作为连词)=since 完成时态---- ever since +主+动词简单过去式

例:I have known him ever since he was a child. ?他从小我就认识他了。 ?这种用法同since 差不多,不过 ever since 比 since 用得少。

再如:We have lived in Shanghai ever since we came to China.(自从我们来到中国之后就住在上海。) ?

2.以上所说的 ever since 作为连词。 ?

ever since 也可作为副词,解释“此后”(就一直...) ?

例:

1)He fell ill at Christmas and has been ill ever since. ?他在圣诞节生病了此后就一直不适。(has + be ill)

2)He left home last year and has been away ever since. ?他去年离家走了,此后一直在外面。(has + be away) ?3)He fell off his horse a week ago and has been in bed ever since. ?一周前他从马背上跌下来,从那以后就一直躺在床上。 ?4)He went to Turkey in 1950 and has lived there ever since. ?他在1950年去土耳其,此后就一直住在那里。 ?

3. has not been able to 这实际上就是 be able to 加上 have 罢了。

所谓 be able to 就是“有可能”不是“能”(can)。如果一直,始终没有可能就是has not been able to ,这很简单。 ?如果 it has not been easy. 就是“那件事一直不是轻而易举的。”完成时态不一定都解释为“已经”,有时要解释为“一直”。 ?相关词汇:?have trouble with sb. 与某人发生了纠纷 ?return home 不可用 return to home ?at night 不可用 at the night ?because of 由于 ?even once 即使是一次 ?have effect 产生效果 ?turn ... to 把···变为

ever since的用法例句

1、He's been there ever since you left!

自从你离开后他就一直在那里!

2、I simply gave in to him, and I've regretted it ever since

我就向他屈服了,从那以后我一直后悔。

3、I've had the hots for him ever since he came to college.

自从他来上大学后,我就对他春心萌动。

4、The girl has grown prettier than ever since I saw her a year ago.

一年不见,小姑娘出落得更漂亮了

篇4:since的用法总结

since then意为 “从那时以来”,通常与动词的现在完成时连用,指从过去某一时刻起到现在为止的一段时间。

Since then 前后各接什么时态

Since then 前后一般接现在完成时,从那以后,现在完成时表示过去的某件事对现在还有影响, 现在完成时的标志性时间状语already , ever , never , yet , just , before, still , lately ,since , for a long time ,up to now, until,so far,in the last few years/weeks/mouths , till now,recently

since then的用法例句

Since then, he has developed another bad habit.

从那以后,他养成了另一种坏习惯。

He hasn't come close to those numbers since then.

自那以后,他从没有达到那赛季的表现。

Ah, times are greatly changed since then!'

“啊,从那时起,世道可变得多厉害呀!”

Exactly three years have passed since then.

从那时起,整整3年过去了。

ever since释义

自从;从那时到现在;自…以后;从…起

篇5:since if的用法总结

if的.用法:

1、if作为连词,引导条件状语从句,表示“假如”、“如果”等意思。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;

2、if可以引导让步状语从句,表示“即使是”、“虽说”之意;

3、if作为连词可以引导宾语从句,和whether意思相同。

篇6:since完成时的用法总结

since的用法归纳:

一、Since作为介词

后接某一确定的时间点,主句谓语动词是持续性动词,常与现在完成时态、现在完成进行时态或过去完成时态连用。

例句:

She’s been working in a bank since leaving school.

她中学毕业后就一直在一家银行工作。

He had spoken to her only once since the party.

自从那次聚会以来,他只跟她说过一次话。

二、Since作为副词

表示从过去以来、以后或到现在的情形或状态,常与现在完成时态连用。

例句:

He came to Zhenjiang 6 years ago and has lived here (ever) since.

他6年前来到镇江,从此便住在这里。

三、since引导原因状语从句

作为连词,since可引导原因状语从句,表示因为;既然;鉴于。

例句:

Since this method doesn’t work, let’s try another.

既然这种方法不行,我们就试用另一种吧。

四、Since引导时间状语从句

1、若since引导的.状语从句的谓语是终止性动词的过去时,则从句表示的时间是“从动作开始的那一时刻起”。

例句:

He has studied very hard since he came to our school.

自从他来到我们学校,他学习就非常努力。

2、若since引导的状语从句的谓语动词是持续性动词或表示状态动词的过去时时,则从句表示的时间是“从动作或状态结束时算起”。

例句:

I haven’t heard any noise since I slept.

我醒后还未听到任何声音。

3、若since引导的状语从句的谓语为持续性动词的现在完成时,则表示动作和状态延续到现在(说话时刻),其表示的时间的起点应从动作发生之时算起。

例句:

I haven’t heard from him since he has lived there。

自从他(开始)住在那儿起,我就一直没收到他的来信。

五、Since在特殊句型中的应用

句型I:

It is (has been)+时间+since+持续性动词的过去时

表示“自从……以来到现在已有多久”。

例句:

It has been quite some time since I was last in London.

我上次离开伦敦至今颇有一段时间了。

句型II:

It was+时间+since+持续性动词的过去完成时

表示“从……到过去某时间点以来”。

例句:

It was three years since we had been here.

那时我们在这已呆了三年。

篇7:关于SINCE的全部用法

关于 SINCE 的全部用法

1.说明

since是一个用法极活跃的词, 也是学习中的重点词汇, 现就其用法归纳如下:

2.用法

用法1:用作介词, 意思是“从以来, 自从”, 常与完成时连用。

例句:I haven’t written home since Christmas. 自圣诞节以来, 我未曾写信回家。

(说明:I haven’t written home为完成时态语句。)

用法2:用作副词,

since意思是“从那时以后(一直到现在)”。

ever since从那以后一直 (更加强调since的用法)。

since副词例句:

Things have not changed very much since.

从那时起, 情况并没有太大的改变。

(说明:副词since可以放在句子后面的,先描述写一段句子:Things have not changed very much,再加一个since。)

ever since副词例句:

H is first book was a great success and he has been famous as a writer ever since.

他的第一本书非常畅销, 从那时起他就成了一位名作家。

(说明:副词ever since放在了句子后面。)

用法3:用作连词 意思是“因为,既然, 鉴于”。

例句:

Since the rain has stopped,let’s go for a walk.

既然雨停了,我们出去散散步吧。

年华原创,空间还很多关于学习英语的日志,欢迎观看学习。

英语中to和for的用法,如何简单区别使用?

for更注重目的,表示有一方受益,to更注重指向。to接不定式动词原形,for接动词ing形式。一般情况下, to后面常接对象; for后面表示原因与目的为多。

for和to的简单区别

for和to这两个介词,意义丰富,用法复杂。这里仅就它们主要用法进行比较。

1. 表示各种“目的”

What do you study English for?

你为什么要学英语?

She went to france for holiday.

她到法国度假去了。

These books are written for pupils.

这些书是为学生些的。

hope for the best, prepare for the worst.

作最好的打算,作最坏的准备。

2.对于

She has a liking for painting.

她爱好绘画。

She had a natural gift for teaching.

她对教学有天赋。

3.表示赞成同情,用for不用to.

Are you for the idea or against it?

你是支持还是反对这个想法?

He expresses sympathy for the common people..

他表现了对普通老百姓的同情。

I felt deeply sorry for my friend who was very ill.

4 .for表示因为,由于(常有较活译法)

Thank you for coming.

谢谢你来。

France is famous for its wines.

法国因酒而出名。

5.当事人对某事的主观看法,对于(某人),对?来说(多和形容词连用)用介词to,不用for..

He said that money was not important to him.

他说钱对他并不重要。

To her it was rather unusual.

对她来说这是相当不寻常的。

They are cruel to animals.

他们对动物很残忍。

6. for和fit, good, bad, useful, suitable 等形容词连用,表示适宜,适合。

Some training will make them fit for the job.

经过一段训练,他们会胜任这项工作的。

Exercises are good for health.

锻炼有益于健康。

Smoking and drinking are bad for health.

抽烟喝酒对健康有害。

You are not suited for the kind of work you are doing.

7. for表示不定式逻辑上的主语,可以用在主语、表语、状语、定语中。

It would be best for you to write to him.

The simple thing is for him to resign at once.

There was nowhere else for me to go.

He opened a door and stood aside for her to pass.

8. 表示前往(某地)去某地,用for不用to

I bought a ticket for Milan.

I start for Shanghai tomorrow.

我明天去上海。

The ship is for Liverpool.

这艘船是开往利物浦的。

9. 表示到达的目的地、终点用to不用for

The bus will take you to the post office.

公共汽车会把你送到邮局去的。

He saw her to the railway station.

他把她送到火车站。

10. 作为(意思接近as)for可以与to互换。

I’ll keep it for a souvenir.

我将把它留作纪念。

He spoke English so well that I took him for a foreigner.

他英语说的那么好,我还以为他是外国人。

He took her to (or for) wife.

他娶她为妻。

11.for表示交换

I bought a bicycle for seven hundred yuan.

我以七百元买了一辆自行车。

He is willing to work for nothing.

他愿意义务地工作。

12.表示就?来说,用for

He was tall for his age.

以他的年龄来说他的个子是很高的。

For so young a man he had read widely.

作为这样年轻的人,他书读的是够多了。

13.表示相应、对应,一般for 的前后用同一个名词。

Don’t translate word for word. 不要逐词翻译。

Blood for blood ! 血债血偿。

Eye for eye, tooth for tooth. 以眼还眼,以牙还牙。

To 的此种用法表示贴着,对着。

The two lovers dance cheek to cheek.

这对情侣跳贴面舞。

They stood face to face ( back to back )

他们面对面(背对背)地站着。

14. to 和动词连用,表示“对”,“向”“给”等

Did you mention this to him?

你向他提到这事了吗?

Give my love to your parents.

代我向你父母问好.

只要你邀请我回答,我必定抽空回答

to的用法

to的用法口诀

to的用法口诀

to 可以是介词,也可以是结构助词。作介词用的时候,后面跟名词或动名词,比如:give the book to Tom. i am looking forward to seeing you. 至于什么时候用to,介词的用法都是固定搭配的,与其记住很容易混淆的多种含义,不如直接背固定词组。

坐结构助词用的时候,是做不定式,也就是to do 形式,后面必须跟动词原形。也可以理解为一种固定搭配,比如want to do , be going to do 。所以最好也是记住固定词组。

情态动词后不加to直接加v.(原)

行为动词加to do sth.(如:need)

(表示时间)到, 直到, 在…到来之前, 离…; 例:from seven to ten

(表示方向)朝, 往, 通向

(表示状态)紧贴着, 紧靠着, 对着;

(表示对象)对, 对于, 对…来说;

(表示比较)比, 相对于;

(表示方位)在…方向[方位], 处于…顺序;

(表示距离)离, 距离;

(表示目标)到达, 直到;

(表示结果)转换为, 转变为, 趋于;

(表示修饰)———的。

for的用法

1. 表示“当作、作为”。如:

I like some bread and milk for breakfast. 我喜欢把面包和牛奶作为早餐。

What will we have for supper? 我们晚餐吃什么?

2. 表示理由或原因,意为“因为、由于”。如:

Thank you for helping me with my English. 谢谢你帮我学习英语。

Thank you for your last letter. 谢谢你上次的来信。

Thank you for teaching us so well. 感谢你如此尽心地教我们。

3. 表示动作的对象或接受者,意为“给……”、“对…… (而言)”。如:

Let me pick it up for you. 让我为你捡起来。

Watching TV too much is bad for your health. 看电视太多有害于你的健康。

4. 表示时间、距离,意为“计、达”。如:

I usually do the running for an hour in the morning. 我早晨通常跑步一小时。

We will stay there for two days. 我们将在那里逗留两天。

5. 表示去向、目的,意为“向、往、取、买”等。如:

Let's go for a walk. 我们出去散步吧。

I came here for my schoolbag.我来这儿取书包。

I paid twenty yuan for the dictionary. 我花了20元买这本词典。

6. 表示所属关系或用途,意为“为、适于……的”。如:

It's time for school. 到上学的时间了。

Here is a letter for you. 这儿有你的一封信。

7. 表示“支持、赞成”。如:

Are you for this plan or against it? 你是支持还是反对这个计划?

8. 用于一些固定搭配中。如:

Who are you waiting for? 你在等谁?

For example, Mr Green is a kind teacher. 比如,格林先生是一位心地善良的老师。

EditSprings

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亚棣君

不登高山,不知天之高也;不临深溪,不知地之厚也。

to 一般为不定式,就是还没做成的事情,to do sth

也有give sth to sb 给予某人,接的是东西传递的对象

还有一种是做特定的介词接名词 the key to success成功的关键,表关系

或在在特定的短语做介词,接动名词 be accustomed to doing sth

但是to 的主要特点是,到达前往

for 用法单一,做介词,表是为了某人,某个目的,因为.而,for you为了你(而做某事),thank for your help谢谢你

Promise的用法讲解

Promise是一个构造函数,其自身有resolve reject all 等方法,原型上有then catch 等方法。

【ES6 Promise 用法讲解】

www.cnblogs.com/whybxy/p/7645578.html

1、最简单的Promise

let any_1 = new Promise((resolve, reject)=> {

setTimeout(=> {

console.log(“经过1s,开始执行”);

resolve(“Promise执行完毕”)

}, 1000);

})

/.

.Creates a new Promise.

.@param executor A callback used to initialize the promise. This callback is passed two arguments:

.a resolve callback used resolve the promise with a value or the result of another promise,

.and a reject callback used to reject the promise with a provided reason or error.

.

new (executor: (resolve: (value?: T | PromiseLike) => void, reject: (reason?: any) => void) => void): Promise;

Promise的构造函数接收一个函数的参数,此函数有两个参数:resolve , reject,分别表示一步操作执行成功和异步执行失败的后的回调函数。

运行上面代码显而易见,一秒后会执行“经过1s,开始执行”,并调用resolve方法。

到了这里会有很多人开始疑问,这个resolve是什么,也并没有用,并没有执行。

2、resolve的使用

上文提到resolve , reject,分别表示一步操作执行成功和异步执行失败的后的回调函数。 那么Promise函数完毕之后如何让这两个函数执行呢?

执行下面代码:

let any_1 = new Promise((resolve, reject)=> {

setTimeout(()=> {

console.log(“1s后执行”);

resolve(“Promise执行完毕”)

}, 1000);

})

any_1.then((data)=> {

console.log(data);

})

控制台LOG:

Promise对象调用then方法,then接收一个函数参数,并且会拿到Promise执行成功回调resolve函数的参数。这即是Promise的作用了。简单来讲,就是能把原来的回调写法分离出来,在异步操作执行完后,用链式调用的方式执行回调函数。

3、链式操作的用法

Promise相对于普通的回调函数(callback)来说从从表面上来说可以简化层层回调的写法,Promise的精髓是“状态”,用维护状态、传递状态的方式来使得回调函数能够及时调用,它比传递callback函数要简单、灵活的多。

下面看一段代码:

/.顺序执行Promise .

private orderGo() {

this.firPromise().then((data)=> {

console.log(data);

return this.secPromise();

})

.then((data)=> {

console.log(data);

return this.thirdPromise();

})

.then((data)=> {

console.log(data);

console.log(“三个执行完毕”);

})

}

按照顺序,每隔一段时间执行一个异步回调,在firPromise方法中传给resolve的数据,可以再接下来的then方法中拿到,下面运行结果:

firPromise secPromise thirdPromise 三个方法的定义如下:

private firPromise(): Promise {

let result = new Promise((resolve, reject)=> {

setTimeout(function() {

console.log(“执行第一个Promise, 500ms”);

resolve(“第一个执行完毕”);

}, 500);

})

return result;

}

private secPromise(): Promise {

let result = new Promise((resolve, reject)=> {

setTimeout(function() {

console.log(“执行第二个Promise, 300ms”);

resolve(“第二个执行完毕”)

}, 300);

})

return result;

}

private thirdPromise(): Promise {

let result = new Promise((resolve, reject)=> {

setTimeout(function() {

console.log(“执行第三个Promise, 200ms”);

resolve(“第三个执行完毕”)

}, 200);

})

return result;

4、reject的用法

到这里大家应该对Promise有了大概的认知,前面笔者只介绍了resolve的用法,还没有介绍reject的用法,下面通过一个简单的例子来捕捉失败的回调:

private rejectPromise(): Promise {

let result = new Promise((resolve, reject)=> {

let math: number = Math.floor(Math.random() .10);

if(math >= 5) {

resolve(“随机数大于5: ” + math);

} else {

reject(“随机数小于5”);

}

})

return result;

}

调用 rejectPromise方法

this.rejectPromise().then( //reject的用法

(data)=> {

console.log(data);

},

(data)=> {

console.log(data);

}

)

上面这段代码,随机数如果大于5代表成功了,反而代表失败了执行reject方法,运行结果有两种:

5、all的用法

Promise的 all 提供并行执行异步操作的能力,并且在所有异步操作执行完毕之后才执行回调。依旧使用上面第一的三个方法,all用法如下:

// -------------all用法---------------

Promise.all([this.firPromise(), this.secPromise(), this.thirdPromise()])

.then((datas)=> {

console.log(datas);

})

// -------------all用法---------------

运行结果:

all方法并行执行三个Promise对象,并把所有异步执行的结果放进一个数组中传递给then,就是上面的datas。

6、在实际开发中的用法

先看一个在Egret上常用的方法getResByUrl的使用:

RES.getResByUrl(“resource/assets/egret_icon.png”, (data)=> {

let icon: egret.Bitmap = new egret.Bitmap(data);

this.addChild(icon);

}, this, RES.ResourceItem.TYPE_IMAGE);

API中:

function getResByUrl(url: string, compFunc?: Function, thisObject?: any, type?: string): Promise;

可以看到getResByUrl 加载一个路径的图片资源,加载完成后执行comFunc回调函数,通过回调函数加载此图片资源,显示出来。我们可以拆分一下这个步骤,如下:

private urlGetImg() {

let result: Promise = RES.getResByUrl(“resource/assets/egret_icon.png”);

result.then((data)=> {

let icon: egret.Bitmap = new egret.Bitmap(data);

icon.x = egret.MainContext.instance.stage.stageWidth - icon.width;

this.addChild(icon);

})

}

二者结果相同,都可以通过路径把图片加载出来。

下面另外一个例子,参考Nasus

创建5 .5个对象,异步依次执行一系列操作,效果如下图。

本次所有行为执行完毕之后,才可以进入下一次操作。使用到tween第三方库,源码如下:

private orderTW() {

for (let i = 0; i < 5; i++) {

for (let j = 0; j < 5; j++) {

let map: egret.Bitmap = new egret.Bitmap(RES.getRes(“egret_icon_png”));

map.anchorOffsetX = map.width / 2;

map.anchorOffsetY = map.height / 2;

map.x = map.width .j;

map.y = map.height .i;

this._layer.addChild(map);

this._layer.x = egret.MainContext.instance.stage.stageWidth / 2 - this._layer.width / 2;

this._layer.y = egret.MainContext.instance.stage.stageHeight / 2 - this._layer.height / 2;

}

}

//当前下标

let index: number = 0;

//执行动作的Promise

let twPromise = () => {

console.log(`执行${index}次`);

return new Promise((resolve1, reject) => {

egret.Tween.get(this._layer.getChildAt(index)).to({

rotation: 30

}, 400).to({

rotation: -30

}, 400).to({

alpha: 0

}, 200).call(() => {

resolve1(index++);

})

})

}

//切换对象的Promise

let orderPromise = () => {

return new Promise((resolve2, reject) => {

twPromise().then(() => {

if (index < this._layer.numChildren) resolve2(orderPromise())

else resolve2(“执行完毕”)

})

})

}

orderPromise();

}

定义两个Promise方法,分别为tween动画的twPromise和执行twPromise方法的orderPromise方法,orderPromise在初始的时候执行,执行此方法会调用twPromise方法和twPromise的then方法,其中then方法会调用index++,也就是一个对象执行一系列tween动画后,切换下一个对象,然后通过resolve2(orderPromise())使整个过程走完。

小结

本教程通过初入Promise到完成一个简单的Demo,由浅入深学习了Promise的用法,如果有兴趣也可以学习下catch race的用法。通过本教程,您可以学到以下知识点:

· Promise是什么

· Promise的常用两个函数resolve reject的使用

· 链式操作和all的用法

篇8:关于since的用法及解释

一.Since作为介词,后接某一确定的时间点,主句谓语动词是持续性动词,常与现在完成时态、现在完成进行时态或过去完成时态连用。例如:

1、He left the village in 1982 and I haven’t seen him since then.1982年他离开这个村子,从那以后我再没见过他。

2、She’s been working in a bank since leaving school.她中学毕业后就一直在一家银行工作。

3.He had spoken to her only once since the party. 自从那次聚会以来,他只跟她说过一次话。

二.Since作为副词,表示从过去以来、以后或到现在的情形或状态,常与现在完成时态连用。例如:

1.He left home two weeks ago and we haven’t heard from him since. 他两周前离开了家,到现在我们一直没有他的消息。

2.He came to Zhenjiang 6 years ago and has lived here (ever) since.他6年前来到镇江,从此便住在这里。

三.since引导原因状语从句

作为连词,since可引导原因状语从句,表示因为;既然;鉴于:例如:

1. He didn’t come since he was busy.他因为忙,所以没有来。

2. Since this method doesn’t work, let’s try another.既然这种方法不行,我们就试用另一种吧。

四.Since引导时间状语从句

1.若since引导的状语从句的谓语是终止性动词的过去时,则从句表示的时间是“从动作开始的那一时刻起”。例如:

He has studied very hard since he came to our school.自从他来到我们学校,他学习就非常努力。

We have been missing them since they left here自从他们离开这里,我们就一直很想念他们。

2.若since引导的状语从句的谓语动词是持续性动词或表示状态动词的过去时时,则从句表示的时间是“从动作或状态结束时算起”。例如:

I haven’t heard any noise since I slept. Sleep 为持续性动词,sleep的动作结束时,即“醒来”时,所以这句应译为“我醒后还未听到任何声音”。

3.若since引导的状语从句的谓语为持续性动词的现在完成时,则表示动作和状态延续到现在(说话时刻),其表示的时间的起点应从动作发生之时算起。例如:I haven’t heard from him since he has lived there。 这里has lived表示动作的持续性,时间的起点应从:“开始居住”时算起。因此此句可理解为“自从他(开始)住在那儿起,我就一直没收到他的来信”。

五.Since在特殊句型中的应用

句型I:“It is (has been)+时间+since+持续性动词的过去时”,表示“自从……以来到现在已有多久。”例如:

It has been quite some time since I was last in London.我上次离开伦敦至今颇有一段时间了。

句型II:“It was+时间+since+持续性动词的过去完成时”,表示“从……到过去某时间点以来”,例如:It was three years since we had been here.那时我们在这已呆了三年。

篇9:关于since的用法及解释

prep.

自…以后;从…以来;(表示气愤)何曾,什么时候

conj.

从…以后;自…以来;因为;由于;既然

adv.

自…以后;从…以来;此后;后来

since的例句

1. In the dozen years since the publication of the first edition of this book, software and interactive products have certainly improved.

本书的第1版问世以来,间,软件和交互产品的确有所进步。

2. Texture is seldom useful for conveying differences or calling attention, since it requires a lot of attention to distinguish.

纹理很少被用来表达不同或者引起注意,因为分辨纹理需要很强的注意力。

3. Expanding dialog boxes were big around 1990 but have declined in popularity since then, largely due to the ubiquity of toolbars and tabbed dialogs.

扩展对话框大约在1990年左右非常流行,自那以后主要是因为工具栏和标签对话框的无所不在而走向衰落。

4. It isn’t unreasonable to suspect a similar pattern in any kind of interface navigation, since this number is consistent with how much information we can hold in our short-term memories; when there are too many colors, we spend time trying to remember what the colors mean, so that slows us down.

这个数字同我们的短期记忆能力有关,我们的短期记忆仅仅能存储有限的信息。 因此当有太多颜色时,我们的大脑不得不花费额外的时间记住每种颜色的意义,这样便降低了我们的处理速度。 所以,在任何界面的导航中都是这样的情况,我们毫无理由超过这个数字。

5. Ultimately, the use of folders or directories as a primary retrieval mechanism requires that users know where an item has been stored in order to locate it. This is unfortunate, since digital systems are capable of providing us with significantly better methods of finding information than those physically possible using mechanical systems.

所以作为主要检索机制的文件夹或者目录,最终需要使用者知道一个物品到底放在哪个位置,才可以找到它。 这就很不幸了,按道理讲,和各种各样的物理世界中的机械系统相比,数字世界应该有能力提供给我们更加优越的查找信息的手段,我们下面要谈的是如何提高这种检索能力。

6. The document that was current at the time of the version selection will be created as a version itself. Also, since disk space is hardly a scarce resource these days, it makes sense to create versions regularly, in case it doesn’t occur to your users.

这个文档在这个时刻也应该成为一个新版本。 另外,既然现在磁盘空间并不是什么稀缺资源,所以有规律地生成版本是有意义的,以防使用者自己没有定时保存。

7. Also, we don’t want to rely on hue as the sole communication vector, since color-blindness is quite common.

还有由于存在着色盲现象,因此我们也不能依赖颜色,把它当做是唯一的传达矢量。

8. This behavior makes sense, since scrolling over long distances requires gross motor movements that make it difficult to stay within the bounds of the narrow scrollbar control.

这种行为很有道理,因为长距离的滚动需要粗略运动控制,使其难以保持在滚动条控件的范围内。

9. While multiple Undo is certainly a very useful mechanism, there’s no reason not to finish the job and use our ample computing resources to allow users to Undo just the undesirable actions, instead of everything that has happened since them.

尽管多次撤销显然是很好的,但也没有理由放着充裕的计算机处理能力不用,而让使用者撤销并不想撤销的操作,最后还是撤销了之前全部所有操作。

10. Of course, adjust these properties with restraint, since the most important element doesn’t need to be huge, red, and outdented—often, varying just one of these properties will do the trick.

当然,因为最重要的元素也无须同时是巨大且红色,而且还是向外突出的,所以我们要谨慎使用这些属性。 一般来说,调整其中一个属性就可以了。

篇10:for和since的用法区别

这两个词都可以和表示时间的词语连用。一般说来, for后接一段时间,用以说明某事一直进行了多长时间,而since后接某一时间(过去的一个时间点),用以表示某件事开始的'时间。

一、for词汇分析

音标:[f(r)]

释义:

prep. 为,为了;因为;给;对于;至于;适合于

conj. 因为

短语

except for 除了 ; 除……之外 ; 除

for sale 出售 ; 待售 ; 可销售的房子 ; 廉价出售

go for 袭击 ; 适用于 ; 竭力想取得 ; 喜爱

拓展资料

1、Can you spare one of them for me?

你能把其中的一个匀给我吗?

2、She booked me down for next flight.

她已为我登记坐下一个航班。

3、I have ordered for you.

我已为你点好菜了。

4、She brewed some coffee for me.

她为我煮了些咖啡。

二、since词汇分析

音标:英 [sns]  美 [sns]

释义:

conj. 因为;由于;既然;自…以来;自…以后

prep. 自…以来;自…以后

adv. 后来

短语

ever since 从那时起 ; 从那时起一直到现在 ; 自从 ; 此后一直

Since then 从此以后 ; 从那以后 ; 自从那时起 ; 从那之后

long since 很久以前 ; 很久以来 ; 从前 ; 早已

拓展资料

1、Since you have no spirit, I have to settle for beer.

既然你没有烈性酒,我就喝点啤酒吧。

2、He has really blossomed out since he fell in love with her.

自从他爱上她以来,他已变得活泼开朗起来了。

3、Since his wife was much younger than he, he was constantly afraid of being cuckolded.

因为他妻子年龄比他小得多,他老是怕戴绿帽子。

4、Our industry has leapt forward since we followed the policy of reform and opening.

自从我们奉行改革开放政策以来,我们的工业飞速发展。

篇11:比较since和for

比较since和for

Since 用来说明动作起始时间,for用来说明动作延续时间长度。

I have lived here for more than twenty years.

I have lived here since I was born..

My aunt has worked in a clinic since 1949.

Some new oilfields have been opened up since 1976.

I have known Xiao Li since she was a little girl.

My brother has been in the Youth League for two years.

I have not heard from my uncle for a long time.

注意:并非有for 作为时间状语的句子都用现在完成时。

I worked here for more than twenty years.

(我现在已不在这里工作。)

I have worked here for many years.

(现在我仍在这里工作。)

小窍门: 当现在完成时+一段时间,这一结构中,我们用下面的`公式转化,很容易就能排除非延续动词在完成时中的误使。

1) (对) Tom has studied Russian for three years.

= Tom began to study Russian three years ago, and is still studying it now.

2) (错) Harry has got married for six years.

= Harry began to get married six years ago, and is still getting married now.

显然,第二句不对,它应改为 Harry got married six years ago. 或 Harry has been married for six years.

篇12:for和since的用法区别和联系

since的用法:

一、Since作为介词

后接某一确定的时间点,主句谓语动词是持续性动词,常与现在完成时态、现在完成进行时态或过去完成时态连用。

例如:

1、He left the village in 1982 and I haven’t seen him since then.1982年他离开这个村子,从那以后我再没见过他。

2、She’s been working in a bank since leaving school.她中学毕业后就一直在一家银行工作。

3、He had spoken to her only once since the party. 自从那次聚会以来,他只跟她说过一次话。

二、Since作为副词:

表示从过去以来、以后或到现在的情形或状态,常与现在完成时态连用。

例如:

1、He left home two weeks ago and we haven’t heard from him since. 他两周前离开了家,到现在我们一直没有他的消息。

2、He came to Zhenjiang 6 years ago and has lived here (ever) since.他6年前来到镇江,从此便住在这里。

三、since引导原因状语从句:

作为连词,since可引导原因状语从句,表示因为;既然;鉴于:例如:

1、He didn’t come since he was busy.他因为忙,所以没有来。

2、Since this method doesn’t work,let’s try anoter.既然这种方法不行,我们就试用另一种吧。

篇13:from和since的用法区别

例:Great changes have taken place in Beijing from 1990 to .

从1990年到,北京发生了巨大的.变化

例:Great changes have taken place in Beijing since 1990.

自1990 年以来北京发生了很大的变化。

时态用法不一样

1、有from表示时间起点的句子,现在、过去、将来的时态都可使用。

2、since表示时间起点的句子不用将来时态

词义广泛性不一样

1、from

prep.(表示起始点)从…起,始于;(表示开始的时间)从…开始

2、since

conj. 因为;由于;既然;自…以来;自…以后

prep. 自…以来;自…以后

adv. 后来

篇14:because since 的区别与用法

since的用法:

(1)Since the rain has stopped,let’s go for a walk.

既然雨停了,我们出去散散步吧。

(2)Since we are young,we shouldn’t be too afraid of making mistakes.

因为我们还年轻,所以不应该太害怕犯错误。

(3)Since you are free today, you had better help me with my mathematics.

既然今天你休息,你最好帮我补习数学。

because的.用法:

(1)We couldn't go out because these robber are still outside.

我们不能出去,因为这些强盗还在外面。

(2)I do it because I like it.

我做这件事是因为我喜欢。

(3)You can trust those products because the quality never varies.

你可以信赖那些产品,因为它们的质量从来不变。

(4)We went by bus because it was cheaper.

我们乘公交汽车去,因为这样便宜一些。

篇15:动词的时态:since的四种用法

1) since +过去一个时间点 (如具体的年、月、日期、钟点、1980, last month, half past six)。

i have been here since 1989.

2) since +一段时间+ ago

i have been here since five months ago.

3) since +从句

great changes have taken place since you left.

considerable time has elapsed since we have been here.

4) it is +一段时间+ since从句

it is two years since i became a postgraduate student

篇16:since与for的用法区别动词的形式

语气不同。

since和for均含有“因为”之意。

但是for作为并列连词,语气较弱,所引出的`句子一般放在后面,表示附带说明的理由或推断理由。

since比for语气稍强,一般用于表示“由于大家已知的事实”。

篇17:since后加什么时间段?

It's a long time since they left.

他们已经离开很久了。

It's been two weeks now since she called.

她到现在已经有两个星期没来电话了。

I had been out since I was 17.

我从17岁起就公开我是同性恋。

The children are completely out of control since their father left.

这些孩子自他们的父亲离开后就无法无天了。

It's been an age since we've seen them.

我们有很长一段时间没有见到他们了。

篇18:since引导什么从句it is

但在It is +时间+since从句的句型中,主句多用一般过去时,且since后的动词若为延续性或状态性动词,应译为否定或相反,若为短暂性动词按字面意思翻译。

例如:

I have been in Beijing since you left.

自从你离开以来,我一直在北京了。

Where have you been since I last saw you?

自上次我和你见面以后,你到哪里去了?

由before和after引导的时间状语从句

before引导的从句不再用否定式的谓语,并且当before引导的从句位于主句之后,有时译成“就,才”。还要注意主句和从句之间的时间关系。当主句用将来时,从句总是用现在时;

如果before引导的主句谓语用的.是过去完成时,则从句动词多用一般过去时,这样以便体现动作发生的先后。After表示主句动作发生在从句动作之后。主句和从句的动作的时间关系正好与before引导的从句相反。

现在完成时课件

初中介词英语用法总结

初中英语时态总结

高考英语的知识点总结

初中英语作文连词

英语时态总结表格

初中英语知识点总结之过去时态的应用

英语八大时态总结

初中英语作文指导

高一英语知识点总结语法

since的用法总结
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