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關系代詞as與which區別詳解
一、引導限制性定語從句
引導限制性定語從句時，在such, as, the same后只能用as，其他情況用 which。如：
I never heard such stories as he tells. 我從未聽過他講那樣的故事。
It’s the same story as I heard yesterday. 這故事跟我昨天聽到的一樣。
Such wind as there was came up the fiver. 當時起的這種風沿江刮了上來。
He was in such a fury as I have never seen. 我從未見過他發這么大的火。
As many as ten people were found living in a single room. 曾發現多達十個人住在一間房里。
It is an organization which helps the elderly. 這是一個幫助老年人的機構。
He possesses qualities which ensure success at school. 他有許多品質保證他學習很成功。
二、引導非限制性定語從句
1. 互換的場合
引導非限制性定語從句時，有時兩者可互換。如：
I live a long way from work, as [which] you know. 我住得離工作單位很遠，這你是知道的。
He arrived early to dust the shop, as [which] was his custom. 他到車間很早，先撣塵土，這是他的習慣。
I had coffee after dinner, as [which] is my usual practice. 我飯后喝咖啡，這是我的習慣。
Sophia was not unconscious, as [which] could be judged from her eyes. 索菲婭并未失去知覺，這從她的眼睛里可以看出。
2. 不能互換的場合
在以下情況引導非限制性定語從句時，兩者不可換用：
(1) 當從句位于主句之前時，只用 as。如：
As you know, next Tuesday’s meeting has been cancelled. 你知道，下周二的會議取消了。
As is known to everybody, the moon travels round the earth once every month. 月球每月繞地球轉一周，這是每個人都清楚的。
(2) 當從句插在主句中間且關系代詞指的是整個句子時，只用 as。如：
Freddie, as might be expected, was attending the conference. 弗雷迪在參加會議，這是可以預料到的。
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