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when的用法大全

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你们知道when的用法吗?我们一起来学习学习吧,下面小编就和大家分享,来欣赏一下吧。

曾几何时:when用法大全

Is life always this hard, or is it just when you're a kid?

——Leon

人生总是这么苦么,还是只有在小的时候?

——《这个杀手不太冷》

一、关于when,你应该知道的用法有

adv.

1.什么时候,何时,什么情况下,什么场合下 at what time; on what occasion

I'd like to know when they'll let him out.

我想知道他们什么时候放他。

2.(用语时间的表达方式之后)在那时,其时 used after an expression of time to mean 'at which' or 'on which'

The Queen's last visit was in May, when she opened the new hospital.

女王上次来访是在五月份,她那时主持了这座医院的落成典礼.

3.其时,当时,当场 at which time; on which occasion

conj.

1.在……时候,当……时,在……期间 at or during the time that

Here the local were always barbered at this hour on this day.

原来本地人老是在这一天这个时候这个地方理发。

2.在……之后 after

When I mingled with other families I distinctly discerned how peculiarly fortunate my lot was.

在我接触到别的一些家庭之后,我清楚地体会到自己可谓得天独厚的天之骄子。

3.在任何……时候 at any time that; whenever

You can save the game at any time when you're at your bunk.

任何时候你都可以在你的床位储存你的游戏。

4.一……就,刚……就 just after which

He is prone to lose his temper when people disagree with him.

人家一不同意他的意见,他就发脾气.

5.考虑到,既然 considering that

Why use wood when you can use plastic?

既然能用塑料,何必非用木料?

n.

时间 time

pron.

什么时候,何时 what / which time

Considerate products know when to bend the rules

体贴的软件知道什么时候调整规则

二、词义辨析:还有以下单词能表示“在……的时候”的意思

when, while, as

这些连词均可表示“当……时”引出时间从句。

when所引导的从句,其谓语动词既可是持续动词,也可是短暂动词;谓语动词动作发生的时间可以与主句谓语动词的动作是同时,或之前、之后。

while句中的谓语动词应为持续动词,不用短暂动词,谓语动作发生的时间通常与主句谓语动词动作发生时间是同时。

as侧重指从句与主句的动作同时进行,谓语动词可以是持续性的,可以是短暂性动词。

三、接下来,做个填词游戏吧

The last time I went to Scotland was in May, ____ the weather was beautiful.

我上次去苏格兰是在五月份,那时的天气好极了。

英语单词学习之while和when的用法与区别

单词的积累和语法的掌握是学习英语的重中之重,也是同学们认为最难的地方。随着英语学习的进度上升,需要掌握的单词会越来越多,下面,沪江小编给大家说说单词中while和when的用法与区别,大家可以作为学习的参考。

while和when都是表示同时,到底句子中是用when还是while主要看从句和主句中所使用的动词是短暂性动作(瞬时动词)还是持续性动作。

1、若主句表示的是一个短暂性的动作,而从句表示的是一个持续性动作时,两者都可用。如:

He fell asleep when [while] he was reading. 他看书时睡着了。

I met him when [while] I was taking a walk in the park. 我在公园散步时遇到了他。

2、若主、从句表示两个同时进行的持续性动作,且强调主句表示的动作延续到从句所指的整个时间,通常要用 while。如:

Don't talk while you're eating. 吃饭时不要说话。

I kept silent while he was writing. 在他写的时候,我默不作声。

3、若从句是一个短暂性动作,而主句是一个持续性动作,可以 when 但不用 while。如:

When he came in, I was listening to the radio. 他进来时,我在听收音机。

It was raining hard when we arrived. 我们到达时正下着大雨。

4、若主、从句表示的是两个同时(或几乎同时)发生的短暂性动作,一般要用 when。如:

I thought of it just when you opened your mouth. 就在你要说的时候,我也想到了。

至于什么是短暂性动作,什么是持续性动作,其实有个很简单的规律。就是如果是进行时态,一般是持续性的。如果是过去式,一般是短暂性动作。

对于,填写when还是while的问题,通常首先看主句和从句中的时态,再根据以上4个规律来判断填写那个单词。

when 和 while 都可以表示“当…时”,用法上有何区别?

这个问题也是很多人平时会问我的,今天就做个了断:

最大一个区别就是:当 when 和 while都可以表示“当…时”,但 when 后面的动词可以是延续性动词或非延续性动词,但 while 后面的动词必须是延续性动词。

顺便补充一下:

①延续性动词是指表示能够延续的动作。如:study, work, stand, lie, know, walk, keep, live,have, wait, watch, sing, read, sleep,stay等。

②非延续性动词又称“瞬间动词”,表示不能延续的动作,这种动作发生后立即结束。如:open, die, close, begin, finish, come, go, move, borrow, lend, buy,arrive等

所以,当从句的动词为延续性动词时,when 可与 while 互换。比如:

I missed my home very much when I was abroad.

我在国外时很想家。

这句话中的 when 可以替换为 while,因为 was abroad 是延续性动词(表达一种长期的状态)。

但在这句话中,情况就不同了:

When I came home, my mom was cooking dinner.

当我回家时,我妈妈正在做晚餐。

When 从句中,came 是非延续性动词,所以不能用 while 来代替 when。

when 和 while 的另一种差异是:

当when 后面的动作往往是一般过去时,那么 when = after,when 从句动作早于主句动作,比如:

I found a shelter when it began to rain.

下雨后,我找到一个避雨的地方。

主句动词 found 发生在 when 从句动词 began to rain 之后。

再如:

When the meeting ended, people left the room.

会议结束后,大家走出房间。

主句动词left发生于 when 从句动词 ended 之后。

而 while 一般连接两个同时发生的动作,比如:

I was studying while my roommate was sleeping.

当我正在学习时,我的室友正在睡大觉。

was studying 和 was sleeping 是同时发生的。

当然,当 when 后面跟过去进行时的时候,跟 while 的用法别无二致了:

请比较:

① I was enjoying my dinner when my wife came home.

② While I was enjoying my dinner, my wife came home.

这两句是一样的,意思都是“我太太回家时,我正在吃晚餐”。

as、while 和 when 的用法区别

as、while 和 when 引导时间状语从句时的区别:

一、意为“当......的时候”

when 从句中既可以用延续性动词, 表示状态或时间段, 也可以用非延续性动词, 表示动作或时间点。

It was snowing when we arrived at the station.我们到达车站时正在下雪。 When he came in, we all stood up, smiling. 当他进来时,我们都站了起来,微笑着。

while 从句中只能用延续性动词,从句一般用的是进行时。而另一件事的状态没有硬性的要求,根据具体情况而定,表示状态或时间段。

While she was typing, someone knocked at the door.

她打字时,有人敲门。

You can go swimming while I'm having lunch.

我吃午饭时你可以去游泳。

as 从句表示的也是一件事情正在发生,另一件事也正在进行当中,从句一般不用进行时,而只是一般过去时,译成“边……边……”。例如:

He sat watching her as she got ready.

他一直坐着看她准备停当。

As she grew older she gained in confidence.

随着年龄的增长她的信心增强了。

As my mother sang those old songs, tears ran down her cheeks.

当我妈妈唱起那些老歌时,眼泪顺着她的脸颊流了下来。

The students took notes as they listened.

学生们边听课边做笔记。

As we talked on, he got more and more excited.

我们继续往下谈的时候,他越来越兴奋。

The little girls sang as they went.

小姑娘们一边走,一边唱。

Just as he caught the ball, there was a tearing sound.

当他抓住球的时候,有一种撕裂的声音。

少数情况下,如果强调动作正在发生,as 从句也可以用正在进行时。这只能算是特例了。

The sad mother sat on the roadside, shouting as she was crying.

伤心的妈妈坐在路边,边哭边叫喊。

As we were going out, it began to snow.

正当我们出门时,雪开始下起来。

He came in as I was going to bed.

我正要上床睡觉,他进来了。

二、when, while, as 的互换

如果从句动作和主句动作同时发生,并且从句动作为延续性动词时,when,while,as 可以互换使用。

When /While /As we were dancing, a stranger came in. ---->dance 为延续性动词

当我们跳舞时,一位陌生人走了进来。

When /While /As she was making a phone call, I was writing a letter.---->make 为延续性动词

当她在打电话时,我正在写信。

While/When/ As I was walking down the street, I noticed a police car in front of the bank.---->walk 为延续性动词

我顺着马路往前走时,发现银行门前停着一辆警车。

五、比较while, when, as

1、as, when 引导短暂性动作的动词。例如:

Just as / Just when / When I stopped my car, a man came up to me.

我刹车后,有一个人向我走来。

2、当从句的动作发生于主句动作之前,只能用when 引导这个从句,不可用as 或 while。例如:

When you have finished your work, you may have a rest.

干完活后,你可以休息一下。

I lost my job when the company moved to another state.

公司搬到了另一个州,我便失业了。

3、as 表达的事件,往往只是主句动作发生的背景或条件时,as 只是一个次要的时间说明,不像while 从句有强调 while 动作本身的意思。因此,as 常常翻译成“随着……”之意。

As the day went on, the weather got worse.

日子一天天过去,天气越变越坏。

As the time went on,the weather got worse.

随着时间的推移,气候更加糟糕。

The atmosphere gets thinner and thinner as the height increases.

随着高度的增加,大气越来越稀薄。

As years go by,China is getting stronger and richer.

随着时间一年一年过去,中国变得越来越富强了。

过去进行时中when和while的用法总结

知 识 点

短动作表示“点”,长动作表示“线”。

1. “主短从长”型:

eg. My baby daughter fell asleep, when/while I was writing this article. (点线重合)

当我在写这篇文章的时候(线),我宝贝女儿睡着了(点)

此时,从句长动作是主句短动作发生的时间背景

2. “主长从短”型:

eg. When my baby daughter fell asleep, I was writing this article.

(线点重合)

当我宝贝女儿入睡的时候(点),我在写这篇文章(线)。

此时,从句短动作是主句长动作发生的时间背景

3. “主长从长”型:

I was writing this article while/when my baby daughter was sleeping. (线线重合)

当我宝贝女儿睡觉的时候(线),我在写这篇文章(线)。

此时,从句长动作是主句长动作发生的时间背景

总结:

在上述例句中,从动作长短看:

when引导的时间状语从句后的动作可长可短。

主从句的动作长短关系可以是点点重合、点线重合或线线重合。

while引导的时间状语从句后面的动作通常都是长动作。

主从句的动作长短关系可以是点线重合或线线重合。

补充:

从动作发生时间上看

when引导的时间状语从句,其谓语动词的动作与主句动词的动作是同时、之前或之后都行。

When my baby daughter fell asleep, I was writing this article. 当我宝贝女儿入睡那一刻,我正在写这篇文章。

(主从句动作同时进行)

when I finished this article, I found my baby daugher sleeping. 当我写完这篇文章时,我发现女儿在睡觉。

(从句写完文章在主句我发现...之前)

Hardly had my baby daugher seen me when she smiled. 我女儿一见我就笑。

(从句她笑在主句女儿见我之后)

while引导的时间状语从句,其谓语动词的动作与主句动词的动作通常是同时进行的。

I was writing this article while my baby daughter was sleeping. 当我宝贝女儿睡觉的时候,我在写这篇文章。

(主从句动作同时进行)

今天先分享到此,你学会了吗?

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练 习

翻译

1. We were having supper when the phone rang.

2. This time yesterday Jack was not watching TV.

3. He was repairing his bike at 7:00 yesterday morning.

4. When/While we were having supper, the light went out.

5. While we were talking, the teacher came in.

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