Question

while,when,as的区别

Answer 1

when , as , while 这三个词都可以引出时间状语从句，它们的差别是：when 从句表示某时刻或一段时间，as 从句表示进展过程，while 只表示一段时间

When he left the house, I was sitting in the garden.
当他离开家时，我正在院子里坐着。

When he arrived home, it was just nine o'clock.
当他到家时，正是九点钟。

As he grew older, he became more intelligent.
随着他年龄的增长，他变得更有才智了。

While he was in London,he studied music.
当他在伦敦时，他学习音乐。

While she was typing the letter,the telephone rang.
当她在用打字机打那封信时，电话响了。

Answer 2

as和when、while的区别

Answer 3

when，while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只能和延续性动词连用。

a. Why do you want a new job when you‘ve 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？

b. 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。

c. Strike 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。

d. 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。

a. 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。

b When 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。

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。

a. When ／While 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。

b. When ／While 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。

3．在将来时从句中，常用when，且从句须用一般时代替将来时。

a. You shall borrow the book when I have finished reading it．在我读完这本书后，你可以借阅。

b. When 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。

三、when用于表示“一……就……”的句型中（指过去的事情）。

sb．had hardly（＝scarcely） done sth．when．．．＝Hardly ／ Scarcely had sb．done sth．when．．．

a. I 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。

b. I 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。

when , as , while 这三个词都可以引出时间状语从句，它们的差别是：when 从句表示某时刻或一段时间 as 从句表示进展过程，while 只表示一段时间。

When he left the house, I was sitting in the garden.

当他离开家时，我正在院子里坐着。

When he arrived home, it was just nine o’clock.

当他到家时，正是九点钟。

As he grew older, he became more intelligent.

随着他年龄的增长，他变得更有才智了。

While he was in London,he studied music.

当他在伦敦时，他学习音乐。

While she was typing the letter,the telephone rang.

当她在用打字机打那封信时，电话响了。