a主格
用who或that，通常用who：
the man who robbed you has been arrested.
抢劫你的那个人已经被逮捕了。
the girls who serve in the shop are the owners daughters.
在店里接待顾客的那几个女孩都是店老板的女儿。
only those who had booked in advance were allowed in.
只有那些预先订票的人可以进去。
would anyone who saw the accident please get in touch with the police?
凡亲眼看见发生事故的人请与警方联系。
但是在all，everyone，everybody，no one，nobody和those后面，也可用that替代who：
everyone who/that knew him liked him.
认得他的.人都喜欢他。
nobody who/that watched the match will ever forget it.
看了这场比赛的人都不会忘记它。
b动词的宾语
用whom，who或that。
指人的关系代词的宾格形式是whom，但这被认为是十分正规的说法。在口语中经常使用who和that来代替whom(that 比who更常用);更加普遍的是索性把宾格关系代词省略：
the man whom i saw told me to come back today.
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