十、状语从句种 类从属连词例 句说 明时间状从When]wheneverWhen I came into the room, he was writing a letter. 当 我 进 屋时，他正在写信。We shall go there whenever we are free.我们什么时间有空，我们就去那里。when 指的是“某一具体的时间”whenever 指的是“在任何时间”whenI was walking along the street when suddenly someone patted me on the shoulder from behind.我正在街上走着，这时忽然有人从后面拍我的肩膀。when 意为“这时”或“在那个时候”,可以看作是并列句,这种用法的 when 分句一般位于句末。whileWhile it was raining, they went out.天下雨的时候，他们出去了。I stayed while he was away.他不在的时候我在。while 指 “ 在 某 一 段 时 间里”，“在…期间”，while 引导的动作必须是持续性的asHe hurried home, looking behind as he went.他赶快回家，不时地一边走一边向后看。as 引导持续性动作，强调主句和从句的动作同时发生beforeBe a pupil before you become a teacher.先做学生，再做先生。afterHe arrived after the game started.比赛开始后，他到了。tillWe waited till (until)he came back .我们一直等到他回来。如主句动词是持续性动作，常用肯定式，表示“直到…为止”untilShe didn’t stop working until eleven o’clock .她到 11 点钟才停止工作。Until he had passed out of sight, she stood there.她站在那里看着，直到看不见他的身影。如主句动词是瞬间动词，常用否定式，表示“直…才”“在…以前不”,从句放在句 首 表 示 强 调 ， 一 般 用untilsinceas soon asGreat changes have taken place in China since 1978.自从 1978 年以来中国发生了巨大的变化。As soon as I arrive in Shanghai, I’ll write to you.我一到上海就给你写信。状语从句在主句之前时一般用逗号与主句分开，如从句在主句之后则不必用标点符号。hardly…whenno sooner…thanI had hardly got home when it began to rain.我 刚 一 到 家 ， 就 下 雨 了 。 =Hardly had I got home when it began to rain.No sooner had we got to the station than the train left.我们刚到车站，火车就走了。Hardly had we ...
