关系代词who与whom的用法是什么

关系代词who与whom的用法是什么
 
两者均只用于人,从理论上说,who 为主格,whom为宾格:
Where’s the girl who sells the tickets? 卖票的女孩在哪里?
The author whom you criticized in your view has written a letter in reply. 你在评论中批评的那个作者已写了一封回信。
但实际上,除非在正式文体中,宾格关系代词 whom 往往省略不用,或用whothat代之:
The man (that, who, whom) you met just now is called Jim. 你刚遇见的那个人叫吉姆。
不过,在以下几种情况值得注意:
1. 直接跟在介词后面作宾语时,只能用 whom,而且不能省略:
She brought with her three friends, none of whom I had ever met before. 她带了3个朋友来,我以前都没见过。
2. 引导非限制性定语从句且作宾语时,who whom均可用,但以用 whom 为佳,此时也不能省略:
This is Jack, who [whom] you haven’t met before. 这是杰克,你以前没见过。
 
 

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