第2个回答 2006-10-17
as soon as是一......就的意思后接时间状语从句.例句:As soon as I get there,I give my mother a call.
when是当什么的时候的意思.例句:I am a student when I am seven years old.
until表示直到什么才,常与 not连用.例句:I don't go home,until I finish the work.
if一般接条件状语从句.例句:If you don't study hard,you will not pass the exam.
beacase表示因为的意思,一般接原因状语从句.例句:I am late for school,beacase I get up late.