1、when，while引导时间状语从句的区别如下：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只能和延续性动词连用。
2、 ① 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？ ②Sorry，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。
3、 ③Strike while the iron is hot．（is为延续性动词，表示一种持续的状态）趁热打铁。
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4、 ④ The students took notes as they listened．（listen为延续性动词）学生们边听课边做笔记。
5、 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从句的谓语动作必须是和主句谓语动作同时发生。
6、 1．从句动作在主句动作前发生，只用 when。
7、 ①When 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。
8、 ②When I got to the 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。
9、 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都可使用。
10、 ①When ／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。
11、 ②When ／While ／As she was making a phonecall，I was writing a letter．（make为延续性动词）当她在打电话时，我正在写信。
12、 3．在将来时从句中，常用when，且从句须用一般时代替将来时。
13、 ①You shall borrow the book when I have finished reading it．在我读完这本书后，你可以借阅。
14、 ②When the manager comes here for a visit next week，Ill talk with him about this．下周，经理来这参观时，我会和他谈谈此事。
15、 三、when用于表示“一……就……”的句型中（指过去的事情）。
16、 sb．had hardly（＝scarcely） done sth．when．．．＝Hardly ／ Scarcely had sb．done sth．when．．． ①I had hardly ／scarcely closed my eyes when someone 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。
17、 ②I had hardly ／scarcely entered my room when the telephone rang．＝Hardly ／Scarcely had I entered my room when the telephone rang．我刚一走进房门，电话就响了。
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