while 与when 用法区别
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发布时间:2023-07-15 10:01
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热心网友
时间:2024-03-23 15:07
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.
热心网友
时间:2024-03-23 15:07
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.