as与which

as与which在非限制性定语从句中的用法

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。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。
2. 引导非限制性定语从句时，有时两者可互换。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。
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。如：
① 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。
② as 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。
He went abroad, which was unexpected. 他出国了，这让大家感到很意外。(不用as)
③ 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)
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，这似乎很自常。
She has married again, which delighted us. 她又结婚了，这使我们很高兴。(不用as)

最简单的记忆： 1，as可放在句首，句中，句末。而which只能放在句末。 2，as翻译成正如、、as is known to all。which引导非限制性定语从句常用来知道整个主句的意思翻译成这、、

1.关系代词as用于the same…as, such…as, (no) so…as, as….as等句型中，在定语从句中可作宾语、表语或状语。 It is the same story as I heard from her yesterday.这故事和我昨天从她那儿听到的相同。 Such people as you described are rare nowadays.你刚才描绘的这种人现在已经很少了。 2.关系代词as还可用来修饰整个主句，表示“这一事实，那一情况”，承接前示或后续的从句的内容，在定语从句中可以充当主语、宾语、表语。 Mr. Smith is very rich, as we can see.史密斯很富有，这一点我们看的出来。 This is also part of my work, as I told you before.我曾告诉过你，这也是我工作的一部分。 which和as的区别 which引导的从句只能放在主句后，主从句之间含有因果关系。 as 引导的从句可在主句前、后，引导的从句常向主句提供一种理由或依据，as在句中还有“正如”的意思，而which则没有。 He has been late for work for 3 days, which made his boss displeased. As may be imagined, he passed the examination successfully.

as、which 两相疑 代表整句引定语 一是位置要分清 which在尾 as 活 二是 意思 有分歧 as 正如 which这