as when while 的区别

as when while 的区别

1.when所引导的时间状语从句,其中的谓语动词既可以延续的,又可以是非延续的.并且与主句中的谓语动词的发生没有先后顺序(无所谓发生在主句动词之前,同时或之后).
而while引导的时间状语从句，其中的谓语动词只能是延续性的,并且与主句中的谓语动词要同时发生.
例:
When he came,I was mending my bike.
不能说While he came,I was mending my bike.
(came是非延续性动词)

2.while引导的时间状语从句多用于进行时态(主句和从句都同时进行,一边...,一边...)，而when一般用法较普遍.
While he was doing his homework,his mother was cooking.
He was a great scientist when he was young.

3.as作“当……的时候”时引导短暂性动作的动词。
As he went into the room,the man stopped shouting.
（这句也可以用when)
当从句表示"随时间推移"连词只能用as，不能用when或while.
As the days went by,he became stronger.

as when while 的区别 原答案： 1.when所引导的时间状语从句,其中的谓语动词既可以延续的,又可以是非延续的.并且与主句中的谓语动词的发生没有先后顺序(无所谓发生在主句动词之前,同时或之后). 而while引导的时间状语从句，其中的谓语动词只能是延续性的,并且与主句中的谓语动词要同时发生. 例: When he came,I was mending my bike. 不能说While he came,I was mending my bike. (came是非延续性动词) 2.while引导的时间状语从句多用于进行时态(主句和从句都同时进行,一边...,一边...)，而when一般用法较普遍. While he was doing his homework,his mother was cooking. He was a great scientist when he was young. 3.as作“当……的时候”时引导短暂性动作的动词。 As he went into the room,the man stopped shouting. （这句也可以用when) 当从句表示"随时间推移"连词只能用as，不能用when或while. As the days went by,he became stronger.

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