第1个回答 2010-01-30
When:以when引导的时间状语从句,其主句表示某些动作正在进行时用过去进行时态。
e.g.They were watching TV when I got to their house.
当我到他们家的时候,他们正在看电视。
While:while引导的时间状语从句常常用过去进行时态。
e.g.While he was sleeping ,I was doing my homework.
当他在睡觉的时候,我正在做作业。
其实记这个最简单的方法就是看到when就想到一个用过去式一个用过去进行时,
看到while就想到两个都用过去进行时。
不过用过去进行时的时候要想到要用延续性的动词。本回答被网友采纳
第2个回答 2010-01-30
我给你的这些初中绝对够用~~
1.与WHILE比较,WHEN用得较广,所引导的从句中动词既可是延续性的,又可是非延续性的,WHILE动词只能是延续性的
如:When the fire broke down,all the sthdents were sleeping.
当火灾发生时,所有的学生正在睡觉.
The telephone rang while I was taking a bath.
我在洗澡时,电话响了.
2.当两个表示时间延续的动作同时发生而又具有对比意味时,用WHILE,这样的复合句中,主从句时态相同
如:Father was preparing a report while I was playing PC games.
爸爸正在准备一份报告,我在玩计算机游戏.
While I played the harp,my sister did her homework.
我在弹竖琴,姐姐在做功课.
3.表述两个发展变化中的情况时常用AS
如:As he talked on,he got more and more excited.
他越说越激动.
As you grow older,you'll know better about youself.
随着年龄的增长,你就会越来越了解自己.
4.表示”一边……一边……“时用AS
如:As he was reading,he was shaking his head,which surely slowed down his reading speed.
他边读书边摇着头,这当然降低了他的阅读速度.
They talked as they walked along the river.
他们边沿河走边谈.
5.表示随着短暂动作的发生,另一行为伴随着发生用AS.
如:My cap was blown away as I sat down.
我坐下时帽子被风吹走了.
6.在时间状语中,用一般现在时表示一般将来时,用一般过去时表示过去将来时.
如:When you get there,ring me up.
你到后,给我来个电话.
Don't forget to bring your camera here when you come.
当你来时别忘了带相机.