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()you are doing that,I’ll go and get some water

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()you are doing that,I’ll go and get some water
为什么用while 不能用as soon as?
while能够引导这样的事态吗?
他不是只限于过去时态吗?
可是句子的时态是一个将来一个现在
不符合as soon
而我看到的while 都用于过去时态啊
()you are doing that,I’ll go and get some water
while只指"时间段",不指"时间点",从句的动词只限于持续性动词.如:
While I slept,a thief broke in.在我睡觉时,盗贼闯了进来.
as soon as 引导时间状语从句,表示“一……就……”.如果主句用将来时或情态动词或祈使句,从句必须用一般现在时代替将来时.如:
I’ll tell him the news as soon as he comes.
他一来我就告诉他那消息.
She may come as soon as she finishes the work.
事情一做完她就可以来.
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”.
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.(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)