1) 时间状语从句
时间状语从句主要由以下连词引导:when, whenever, as, while, since, until, till, before, after, as soon as, once, hardly when, no sooner than。
I will discuss the matter with you when we meet tomorrow.
He didnt go to sleep until he finished doing his homework.
You have changed a lot since we met last time.
时间状语从句还可由某些可充当连词的名词和副词引导:
I will tell you the news the instant I know.
Directly the teacher came in everyone was quiet.
Note:
① before除了可表示 在之前外,还可用来强调主句所表达的时间、距离很长或花费的力量相比较大,可译为才。。
It was a long time before I got to sleep again.
They had not been married a month before they quarreled.
② 如果位于when引导的分句之前的主句使用过去进行时、过去完成时或was/were about to, was/were on the point of等结构时,when表示突然发生某事,可译为正在突然或刚就等。这时,不能够用as或while来代替when。
I was walking on the street when I ran into my old friend John.
She had just fallen asleep when the telephone rang.
We were about to leave when it began to rain.
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