关系代词as与which有什么区别

关系代词as与which有什么区别
 
一、引导限制性定语从句
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。
Such wind as there was came up the fiver. 当时起的这种风沿江刮了上来。
He was in such a fury as I have never seen. 我从未见过他发这么大的火。
As many as ten people were found living in a single room. 曾发现多达十个人住在一间房里。
It is an organization which helps the elderly. 这是一个帮助老年人的机构。
He possesses qualities which ensure success at school. 他有许多品质保证他学习很成功。
 
二、引导非限制性定语从句
1. 互换的场合
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。
He arrived early to dust the shop, as [which] was his custom. 他到车间很早,先掸尘土,这是他的习惯。
I had coffee after dinner, as [which] is my usual practice. 我饭后喝咖啡,这是我的习惯。
Sophia was not unconscious, as [which] could be judged from her eyes. 索菲娅并未失去知觉,这从她的眼睛里可以看出。
 
2. 不能互换的场合
在以下情况引导非限制性定语从句时,两者不可换用:
(1) 当从句位于主句之前时,只用 as。如:
As you know, next Tuesday’s meeting has been cancelled. 你知道,下周二的会议取消了。
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) 当从句插在主句中间且关系代词指的是整个句子时,只用 as。如:
Freddie, as might be expected, was attending the conference. 弗雷迪在参加会议,这是可以预料到的。

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