杭州最帅警察任泽政:when与while的使用有什么区别???

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when与while的使用有什么区别???

Thank you very much!!!

when, while和as的区别:when引导的从句的谓语动词可以是动词,又可以是瞬时动词。并且when有时表示“就在那时”。例如:
When she came in, I stopped eating.她进来时,我在吃饭。(瞬时动词)
When I lived in the countryside, I used to carry some water for him.当的住在农村时,我常常为他担水。(动词)

We were about to leave when he came in.我们就要离开,就在那时他进来了。

While引导的从句的谓语动作必须是,并强调主句和从句的动作同时发生(或者相对应)。并且while有时还可以表示对比。例如:

While my wife was reading the newspaper, I was watching TV. (was reading和was watching同时发生)

I like playing football while you like playing basketball.我喜欢踢足球,而你喜欢打篮球。(对比)

WHEN 后面可以加任何语态 而WHILE 后面只能是 -ING格式