【高中词汇辨析】关系代词as与which的用法区别
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1、引导限制性定语从句时,在such, as, the same后只能用as,其他情况用 which

I never heard such stories as he tells. 我从未听过他讲那样的故事。

It’s the same story as I heard yesterday. 这故事跟我昨天听到的一样。

This is the photo which shows my house. 这张照片拍的是我的住宅。

2、引导非限制性定语从句时,有时两者可互换。

I live a long way from work, as /which you know. 我住得离工作单位很远,这你是知道的。

3、但在,在以下情况引导非限制性定语从句时,两者不可换用。

1)当从句位于主句前面时,只能用 as

 As is known to everybody, the moon travels round the earth once every month.

月球每月绕地球转一周,这是每个人都清楚的。

2as 引导的非限制性定语从句应与主句在意义上和谐一致,which无此限制。

He went abroad, as [which] was expected.

他出国了,这是大家预料到的。他出国了,这是大家预料到的。

He went abroad, which was unexpected. 他出国了,这让大家感到很意外。(不用as)

3as 引导非限制性定语从句时,先行词通常不能是主句中某个具体的词,而应是整个句子、整个短语或某个短语推断出来的概念,而which 则无此限制。

The river, which flows through London, is called the Thames. 这条流经伦敦的河叫泰晤士河。(不用as)

4)当as 引导非限制性定语从句作主语时,其谓语通常应是连系动词,而不宜是其他动词,而 which则无此限制

She has married again, as /which seemed natural. 她又结婚了,这似乎很自然。

She has married again, which delighted us. 她又结婚了,这使我们很高兴。(不用as)

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