while 与when 用法区别fff

while 与when 用法区别fff
while 与when 用法区别
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while 与when 用法区别fff
when,while都有“当……时候”的意思.
when既可表示某一点时间,也可以表示某一段时间 .
在when引导的时间状语从句中,其谓语动词可以是延续性的,也可以是非延续性的,可与主句中的谓语动词同时发生,也可在其后发生.
例如：
1、I was just reading a book when she came into my room.
她走进我房间时,我正在看书.
2、Were you writing when the teacher came in?
老师进来的时候,你在写信吗?
3、When he was a child he was always trying out new ideas.
他小时候就常常试验一些新的设想.
（二）、while只能表示某一段时间,不能表示某一点时间.在while引导的时间状语从句中,其谓语动词只能是延续性的,而且也只能与主句中的谓语动词同时发生或存在.
例如：
1、While Jim was mending his bike,Lin Tao came to see him.
正当吉姆修自行车时,林涛来看他.
2、You can’t do your homework while you’re watching TV.
你不能一边看电视一边做家庭作业.
（三）、另外,when和while的区别还在于：while引导的时间状语从句多用进行时态,而when引导的时间状语从句多用一般时态.
例如：
1、While they were talking ,the bell rang.
正在他们谈话的时候,上课铃响了.
2、I was doing my homework when my mother came back home yesterday evening.
昨天晚上妈妈回家的时候,我正在做家庭作
注意：
1) 如主句谓语动词表示的是短暂动作,从句时间状语指一段时间,when while as 三者可通用.
例如：
Peter came in while /as I was watching TV.当Peter进来的时候我正在看电视.
I was watching TV when Peter came in.当Peter进来时我正在看电视.
2) as 和 when 可与非延续性动词连用,而 while 只能与延续性动词连用.
例如：He came in when/ as I was going to bed.我正要上床睡觉,他进来了.
3) as 和 while可用来指一段时间,但 as 强调主句与从句表示的动作同时发生,while强调主句表示的动作是在 while 从句的动作延续中发生.
例如：
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.
I came in while he was reading an interesting book in his room.

1 背景介绍
While 和 When 都可以被用来介绍比较长的“背景”行为或场景。这些行为和场景是在某事发生的同时，正在进行的“背景”
Somebody broke into the house when they were playing cards.
While they were playing cards, somebody broke into the ho...

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1 背景介绍
While 和 When 都可以被用来介绍比较长的“背景”行为或场景。这些行为和场景是在某事发生的同时，正在进行的“背景”
Somebody broke into the house when they were playing cards.
While they were playing cards, somebody broke into the house.
2 同时进行的长时间行为
如果两个持续时间较长行为同时进行，一般用While
While you were reading the paper, I was working.
如果提到的是年龄或生命里的的一段时间，需要用When
When I was a child we lived in London
His parents died when he was twelve
3 同时进行的短时间动作
两个同时发生的动作，需要用When. 这种情况下不能用While
I thought of it (just) when you opened your mouth.
4 省略句
主语省略句中可以用While或When
While/When in Germany, he got to know a family of musicians.

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