when while as 表示当的意思,有什么区别?简洁的区别

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when while as 表示当的意思,有什么区别?简洁的区别
when while as 表示当的意思,有什么区别?简洁的区别

when while as 表示当的意思,有什么区别?简洁的区别
When的范围i比较大,可以指接延续和非延续动词,When i got there ,he had gone.
When i was walking on the street ,i met an old friend.
此外when 还可以“就在那时” I was walking in the forest when a lion appeared in front of me.
While 所引导的时间状语从句必须谓语动词是延续的,并且强调在此期间.如 While he was reading ,the electricity was cut off.
As 所引导的时间状语从句主要强调“随着”或“一边.一边”如：As time goes by ,i love you more and more.As they were walking ,they were singing.

when后面接的是短暂动作
如：I was walking in the street when I met her. 看见她，动作短暂。
while 后面接延续性行为，但这个动作肯定和主句动作时间不一样长。
如：He was talking to me while he was watching the TV。应该说“看电视”比“谈话”时间长。
as通常两个动作一...

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when后面接的是短暂动作
如：I was walking in the street when I met her. 看见她，动作短暂。
while 后面接延续性行为，但这个动作肯定和主句动作时间不一样长。
如：He was talking to me while he was watching the TV。应该说“看电视”比“谈话”时间长。
as通常两个动作一直相随，很可能时间相同。
如：He was thinking of a question as watching the TV。这两个动作就是一直相随的。

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