when和while的区别as

文/刘思琪

while引导一个持续的动作或者状态,用于表示在这个持续的时间或者状态内另一件事情发生,while引导的从句动词大多数情况用进行时态。when暗含一种条件关系,所以很多时候可以用if代替,从句可以是一般时态,也可以是进行时态。as暗含两个事件同时发生是偶然现象,因此主句和从句一般不会同时为持续动作。

when和while的区别as

as、when和while的区别

1. As/When/While:A was happening, B happened或B happened as/when/while A was happening.

as,when,while用来表示“当某事发生的时候,一个长的行为或事件正在进行”。

当从句引导的句子表示持续性动作时,as/when/while引导的从句一般用过去进行时(was/were+动词ing)。例如:

As I was walking down the street I saw Joe driving a Porsche.当我正在沿着街道走的时候,我看到乔正开着保时捷。

The telephone rang when i was having a bath 当我正在洗澡的时候,电话铃响了。

as,when,while都可以用现在时态,如:

Please don't interrupt me when I'm speaking.当我说话的时候,请不要打断

I often get good ideas while I'm shaving.当我刮胡子的时候,我经常能想到好点子。

2. while A was happening,B was happening或While A happened, B happened

while用来表示两个长动作或事件过去同时发生,用过去进行时或者过去时态。如:

While you were reading the paper ,I was working.当你在读报纸的时候,我正在工作。

John cooked supper while I watched TV.当约翰在煮晚饭的时候,我在看电视。

也可以用现在时态,如:

After supper,I wash up while Mary puts the children to bed.晚饭后,当玛丽弄孩子们睡觉的时候我在洗漱。

3. As A happened,B happened.

B happened,as A happened.

as,when和while的区别

as 用在两个短的行为或事件同时发生,如:

As I opened my eyes I heard a strange voice.当我睁开眼睛的时候,我听到奇怪的声音。

The doorbell rang just as i picked up the phone.当我拿起电话的时候,门铃响了。