关于when,as,while的填空题1.someonesteppedonmytoes（）Iwaswaitingforthebus．2.youmustlookbothways（）youcrosstheroad．3.（）thechildrenwalkedalongthelake,theysanghappily．说下怎么想的.

Question

关于when,as,while的填空题
1.someone stepped on my toes（ ）I was waiting for the
bus．
2.you must look both ways （ ）you cross the road．
3.（ ）the children walked along the lake ,they sang happily．
说下怎么想的.

Answer 1

while
when
As
while后面从句一般用进行时态
when引导的时间状语从句,可表示从句动作发生在主句后,也可在主句前,也可以和主句的动作同时发生..可跟“时间点”,也可以跟“一段时间”.
而as引导的时间状语从句,则一般表示主句和从句的动作同时发生,一般跟延续性动词用,有延伸的意义