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as与which引导非限制性定语从句的区别

作者: admin来源: 网络文章 时间: 2021-03-04

这类定语从句只能由 which 或 as 引导。两者之间的区别在于:

1. which 引导的定语从句只能位于主句后,但as引导的从句可位于主句前、中、后。如:

David, as you know, is a photograopher. 戴维是个摄影师,你是知道的。(不可用which)

Li Ming is late, as is often the case. 李明迟到了,这事是经常发生的。(不可用which)

2. as在定语从句中作主语时,从句谓语通常要有be或别的系动词,但which不受此限制。如:

Li Ming was late, which (=and this) made Mr. Zhang very angry. 李明迟到了,这件事使张先生非常生气。(不可用as)

3. as 引导的定语从句只表示一个众所周知或意料之中的事,但 which 不受此限制。如:

He married her, which was unexpected. 他和她结婚了,这是出乎意料的。(不可用as)

4. as有“正如”之意,而which则意为“这(件事,一点)”,可用and this/that/it来代替。

5. as多用于固定搭配中:as is often the case(这是常有的事),as was expected(不出所料),as often happens(正如经常发生的那样),as is known to all(众所周知),as has been said before(如上所述),as is mentioned above(正如上面所提到的)等。

注:which 代表整个句子,还可用于in which case, at which point, on which occasion等。如:

I may have to work late, in which case I'll telephone you. 我可能得晚点下班,那样我会给你打电话的。

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