The Adverbial Clause ( 状语从句 )1 、时间状语从句: 从属连词有: when, while, as, whenever, before, after, since, till, until, as soon as, once… 等
注意:( 1 ) when, as, while when 既可引导持续性动作,又可引导短暂性动作
它表示动作同时发生,或从句的动作发生在主句动作之前
as 引导持续性动作,侧重主句和从句的动作同时发生
He sang as he walked
While :指的是“在某一时间里”,“在…期间”,从句里的动作必须是持续性的,它也强调主句和从句动作的同时发生,往往侧重主句和从句动作的对比
While we were watching TV, he was writing a composition
while 也可做并列连词,表示对照的意思
He is tall while his brother is short
当 when, as, while 表示“在…一段时间里”,主从句的动作同时发生时,可以换用
While (When 或 As) we were discussing, Mr
Smith came in
注意: ( 2 )… as soon as… =The moment/minute/second/instant… =No sooner
/ Hardly…when
/ Scarcely…when
=directly/immediately/instantly =On/Upon sth
/ doing…注意: ( 3 ) Beforee
I had waited long before she came
It won’t