before,after,as soon as,until在时态上的区别.以下两题请具体作答.

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before,after,as soon as,until在时态上的区别.以下两题请具体作答.
1.The doctor didn't have a rest______the operation was over.A.before,B.after,C.until
2._________he heard a girl crying for help outside,he rushed out of the room.
A.Before,B.As soon as,C.After

两句的主句与从句均为过去时,所以
1、选until.为not until的典型用法.
2、选as soon as.是“一…就…”的典型用法.
两句before均不能胜任；再看after,其引导的从句,与主句的动作发生明显是一前一后,同为过去时态时就出现时态的问题.in the word,就是as soon as引导的从句与主句的动作之间几乎没有时间间隔,而after引导的存在较大时间间隔,必须关注主句与从句的时态,尤其是过去时.但是可以简单地改写成：
1、The doctor did have (took) a rest when the operation was finishing.
2、He was rushing out of the room when he heard a girl crying for help outside.

when、while、until、after、before、as soon as引导时间状语从句是的主句和从句的时态是怎 when,while,as soon as,before,after的区别 while,as...,soon...as,when,until,after,berore的区别是什么?在什么时候用? when,while ,until,till ,as soon as ,as ,after ,before,引导的时间状连词before,until,while,as,since,as soon as,after的用法 while,when,until,after,before,as soon as 怎么用? when while before after as soon as until填空用when,while,as soon as,until,before,after填空 when/as soon as/until/while 用这些次作时间状语从句的具体用法特别是时态上的 as soon as,when,while,before,after,until引导的时间状语从句的用法 when,while,as,as soon as,before,after,not……until这几个词有什么区别如何区分when.while.as.before after.as soon as until时间状语从句的主句和从句