状语从句
状语从句在主从复合句中修饰主句中的动词, 形容词或副词,按意义可分为时间、地点、 原因、目的、结果、条件、方式、比较、让 步等状语从句。
从句的位置放在句首,也可放在句末。放在 句首时,从句后面常用一个逗号,放在句末 时,从句前一般不用逗号。
1、时间状语从句:
引导时间状语从句的从属连词有:when, while, as, whenever, before, after, since, till, until, as soon as, once,the moment, immediately, no sooner…than, hardly…when, by the time, every time, last time…等引 导。 (1)when, as, while (从属连词)
I recognized him the moment I saw him.
--- Did you remember to give Mary the money you owed her? --- Yes, I gave it to her ______ I saw her.(’01全国春招)
A. while B. the moment C. suddenly D. once
4) Not until all the fish died in the river ___ how serious the pollution was.(NMET95)
A. did the villagers realize B. the villagers realized C. the villagers did realize D. didn’t the villagers
(从句动作在前)
as引导持续性动作,侧重主句和从句的动作同 时发生。