while和when用法对比及例句分析

when 和 while 都有“当……的时候”的意思,都可以作连词,引导时间状语从句。但两者在用法上有一定的区别。when 当......之时(时间点),后接短暂性瞬间动词;when 在......期间(时间段),后接延续性动词。

while和when用法的区别分析

when和while的区别一:

when 当......之时(时间点),后接短暂性瞬间动词

when 在......期间(时间段),后接延续性动词
while在......期间(时间段),后接延续性动词
因此,when可后接短暂性或延续性动词,而while只能接延续性动词。
后接短暂性终止性瞬间动词时,常用when,不用while;
后接延续性动词时,when和while常可替换使用;

I was reading when you came in.
当你进来的时候,我正在看书。
came是短暂性动词,此处when不能用while代替
You came in while I was reading.
= You came in when I was reading.
read是延续性动词,此处when可用while代替
when和while的区别二:
1.表示正在做某事的期间,发生了意料之外的另一个短暂的动作,要对比这两件事,常用:
主句(过去进行时-持续性动词),when从句(一般过去时-短暂性动词)

We were playing games happily when we heard a cry.
我们正在高兴地玩游戏的时候,(突然)听见了一声大叫。

2.若主句和从句的动作都比较长,表示同时发生,更常用while

此时可用进行时态或一般时态
He waited in the car while I was in the shop.
当我在店里的时候,他在车里等着。
He was watching TV while I was writing.
当我在写作的时候,他正在看电视。

区别三:
1.when可表示表示某个动作发生结束后紧接发生另一个动作,而while则不可
When the bell rang, John went out of the classroom.
铃声响后,约翰走出教室。

2.若表示的时间跨度太长,一般用when比较自然,时间跨度不长,可用while
When I was young, I played football.
当我年轻的时候,我踢足球。
While the movie was on, he left the cinema.
在播放电影的时候,他离开了电影院。

while和when用法例句

1.When: 所引导的从句谓语动词可以是延续性动词,也可以是非延续性动词;从句的时态多用一般现在时或一般过去时。

例句1:When I arrived home, my mother was cooking.

当我到家进,妈妈正在做饭。

例句2: I get the giggles when I'm nervous.

我紧张时就不停地咯咯大笑。

2. while: 所引导的从句谓语必须是延续性动词;从句一般要用进行时态,如果主句和从句的动作时同时进行的,则主句也应为进行时态。

例句3: The telephone rang while I was watching TV.

当我在天电视时,电话铃响了。

例句4: I was writing a letter while my father was reading a newspaper.

我爸爸在看报纸时,我正在写信。

例句5: I will finish my homework while you help me clean the room.

你帮我打扫房间的时候我会做完我的作业。

另外,作连词时,while还有一个意思是“然而,尽管”,这个意思是when所没有的,在考试中也会经常出现。

例句6: While I am willing to help, I do not have much time available.

尽管我愿意帮忙,但是没有多少时间。



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