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中考英语知识点:when, while和as的区别

2019年08月26日 00:37来源:未知手机版

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when引导的从句的谓语动词可以是延续性的动词,又可以是瞬时动词。并且when有时表示 就在那时 。

When she came in, I was 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。(延续性的动词)

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延续性的,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是延续性的动词,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)

As表示 一边 一边 ,as引导的动作是延续性的动作,一般用于主句和从句动作同时发生;as也可以强调 一先一后。

We always sing as we walk.我们总是边走边唱。(as表示 一边 一边 )

As we was going out, it began to snow.当我们出门时,开始下雪了。(as强调句中两个动作紧接着先后发生,而不强调开始下雪的特定时间)

有时这三个连词可以互换,有时不可以。

lt was raining hard when (as) I got there.

我到那里时,正在下大雨。 ( 动作同时发生,when可换为as, 但不能换为while,因为get是点动词.)

When I had read the article, he called me.

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