关系代词as和which的区别是什么

关系代词aswhich的区别是什么
 
1. 互换的情况:两者有时可互换。如:
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。
2. 只有as的情况:以下两种情况,习惯只用as,不用which
①在such, as, the same后引导定语从句时只能用ash。如:
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。
当从句位于主句前面时,只用 as。如:
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。
3. 值得注意的情况:以下三种情况值得注意。
as 引导的非限制性定语从句应与主句在意义上和谐一致,但which无此限制。比较:
He went abroad, as [which] was expected. 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)
as 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。如:
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)
③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,这似乎很自常。
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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