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1、When，While ， As 引导时间状语从句的区别when ， while ，as 显然都可以引导时间状语从句，但用法区别非常大。一、 when可以和延续性动词连用，也可以和短暂性动词连用；而while和as只能和延续性动词连用。 Why do you want a new job when youve got such a good one already ？（ get 为短暂性动词）你已经找到如此好的工作，为何还想再找新的？Sorry ， I was out when you called me （ call 为短暂性动词）对不起，你打电话时我刚好外出了。Strike while th
2、e iron is hot （ is 为延续性动词，表示一种持续的状态）趁热打铁。 The students took notes as they listened（ listen为延续性动词）学生们边听课边做笔记。二、when从句的谓语动词可以在主句谓语动作之前、之后或同时发生；while和 as 从句的谓语动作必须是和主句谓语动作 同时发生 。1从句动作在主句动作前发生，只用 when。When he had finished his homework ，he took a short rest （ finished 先发生）当他完成作业后，他休息了一会儿。When I got to th
3、e airport， the guests had left（ got to后发生）当我赶到飞机场时，客人们已经离开了。2从句动作和主句动作同时发生， 且从句动作为延续性动词时， when，while ， as 都可使用。When While As we were dancing ，a stranger came in（ dance 为延续性动词）当我们跳舞时，一位陌生人走了进来。When While As she was making a phone call， I was writing aletter（ make为延续性动词）当她在打电话时，我正在写信。3 当主句、从句动作同时进行，从句
4、动作的时间概念淡化，而主要表示主句动作发生的 背景或条件 时，只能用 as 。这时， as 常表示“随着 ”；“一边 ，一边 ”之意。 As the timewent on ，the weather got worse（ as 表示“随着 ”之意） The atmosphere gets thinnerand thinneras the heightincreases 随着高度的增加，大气越来越稀薄。As years go by，China is getting stronger and richer随着时间一年一年过去，中国变得越来越富强了。The little girls sang as
5、they went小姑娘们一边走，一边唱。The sad mother sat on the roadside，shouting as she was crying伤心的妈妈坐在路边，边哭边叫。4 在将来时从句中，常用when，且从句须用一般时代替将来时。You shall borrow the book when I have finished reading it在我读完这本书后，你可以借阅。When the manager comes here for avisit next week，Ill talk withhimabout this下周，经理来这参观时，我会和他谈谈此事。三、 wh
6、en用于表示 “一 就 ” 的句型中（指过去的事情）。sbhad hardly （ scarcely ） done sth whenHardly Scarcely had sb done sth whenI had hardly scarcely closed my eyes whensomeone knocked at the door Hardly Scarcely had I closed my eyes when someone knocked at the door 我刚一闭上眼，就有人在敲门了。I had hardlyscarcely entered my room when th
7、e telephone rangHardlyScarcely had I entered my room when the telephone rang我刚一走进房门，电话就响了。Whenwhileas的区别when是 at or during the time that,既指时间点，也可指一段时间；while是 during the time that，只指一段时间，因此when引导的时间状语从句中的动词可以是 终止性动词 ，也可以是 延续性动词 ，而 while 从句中的动词必须是延续性动词。when 说明从句的动作和主句的动作可以是同时 ，也可以是先后 发生；while则强调主句的动作在
8、从句动作的发生的过程中或主从句两个动作同时发生 。由 when引导的时间状语从句，主句用过去进行时，从句应用一般过去时；如果从句和主句的动作同时发生， 两句都用过去进行时的时候， 多用 while 引导，如：a. When the teacher came in, we were talking.当此句改变主从句的位置时，则为：While we were talking, the teacher came in.b. They were singing while we were dancing.when和 while 还可作并列连词。 when表示“ 在那时 ”； while 表示“ 而，却 ”，表对照关系。如：a. The children were running to move the bag of rice when they heard the sound of a motor bike.孩子们正要跑过去搬开那袋米，这时他们听到了摩托车的声音。 b. He is strong while his brother is weak.他长得很结实，而他弟弟却很瘦弱。具体你可以参考这一段。