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八年级英语while,when,as的区分

发布时间:2013-09-21 11:25:28  

while, when ,as

一般同时加以区分方法如下:

1) 如主句谓语动词表示的是短暂动作,从句时间状语指一段时间,三者可通用。

例如:

Peter came in while /as /when I was watching TV.

当Peter进来的时候我正在看电视。

I was watching TV when Peter came in.

当Peter进来时我正在看电视。

2) as 和 when 可与非延续性动词连用,而 while 只能与延续性动词连用。

例如:

He came in when/ as I was going to bed.

我正要上床睡觉,他进来了。

3) as 和 while可用来指一段时间,但 as 强调主句与从句表示的动作同时发生,while强调主句表示的动作是在 while 从句的动作延续中发生。

例如:

As my mother sang those old songs, tears ran down her cheeks.

当我妈妈唱起那些老歌时,眼泪顺着她的脸颊流了下来。

I came in while he was reading an interesting book in his room. 我进来的时候他正在房间里看一本有趣的书。

3)如果从句和主句要表示一个人的两个动作交替进行或同时完成时,则多用as,可译为“一边......,一边......”。

例如:

He looked behind from to time as he went.他一边走,一边不时地往后看。 As time goes on, it’s getting warmer and warmer..随着时间的推移,天气变得越来越暖了。

I thought of it just as you opened your mouth.你一张嘴我就知道你要说什么。(若表示两个短促动作几乎同时发生时,用as的场合多于when.)

4)当主从句之间表示转折或对比关系时,多用while, 不用as或when。 例如: She thought I was talking about her daughter, while in fact, I was talking about my daughter.她以为我在谈论她女儿,而事实上,我在谈论我的女儿。

5)如果表示从句的动作在主句的动作“之前”或“之后”发生时,多用when(=after), 不用as或 while。此外,when还含有“at that moment”的意思(= and then),引起的句子不能放在句首,也不能用as, while

来替换。

例如:

He was about to leave when the telephone rang.他正要离开,忽然电话铃响了。

We were watching TV when suddenly the lights went out.我们正在看电视,突然灯灭了。

They had just arrived home when it began to rain.他们刚到家,天就开始下雨了。

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