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Making Sense of Grammar
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when and while 有哪些相同点和不同点
asked Mar 8, 2019 in Questions about English Grammar by 118070100216yxy (300 points) | 107 views

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两者都表示当...时候

When既可以表示某一时间点,也可以表示某一时间段,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,可与主语中的谓语动词同时发生,也可以在其后发生。

例: I was just reading a book when she came into my room.

       When he was a child ,he was always trying out new ideas.

While只能表示某一时间段,不能表示某一时间,在While 引导的时间状语中,其谓语动词只能是延续性的,而且只能与主句中的谓语动词同时发生或存在。I was doing my homework ,while bob was watching TV.

若从句是一个短暂性动作,而主句是一个持续性动作,一般用when 而不用while.

When he came in, I wzs doing my homewoirk.

填写when 还是while, 通常首先看主句和从句的时态,然后再具体判断。
answered Mar 11, 2019 by 116070100215hl (3,260 points)

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913 questions
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