before,after,as soon as,until在时态上的区别.以下两题请具体作答.
2个回答

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.