指人的关系代词：who, whom, whose, that 的用法：
(1) 作主语(who, that )
Those who are going to play in the match are to meet at the gate at 1:30 after lunch.
那些参加比赛的人午饭后1：30在大门口集合。
在本句中，先行词是those;关系代词who引导定语从句，同时代替先行词在从句中担任动词are going to play 的主语。
The man who/that is talking with Mr. Wang is a famous doctor.
正在和王先生说话的那个人是一个有名的医生。
在本句中，先行词是the man;关系代词who/that引导定语从句，同时代替先行词在从句中担任动词is talking的主语。
这个复合句可以还原成两个句子：The man is a famous doctor. He is talking with Mr. Wang.
(2) 作宾语包括作介词宾语(whom, that )。此种情况下的关系代词可以省略;
This is just the man (whom/that) I want for the job.这正是我要的做这份工作的人。
在本句中，先行词是the man；关系代词whom/that引导定语从句，同时代替先行词在从句中担任动词want 的宾语。
Is he the manager (whom/that) you are looking for?
他是你在找的那位经理吗?
(3) 当关系代词紧跟介词作介词宾语时，不能用that，也不能省略，
如：The book from which I got a lot of useful information was written by a famous scientist.
我从中得到许多有用信息的那本书是一位著名科学家写的。
Who is the boy with whom you were talking a moment ago.
你刚才和他说话的那个男孩是谁?
I know the young couple from whose house the music is coming.
但是当介词放在从句末尾时，作为介词宾语的关系代词可以用that 并且可以省略。
如上头两句可改为：
The book (that /which) I got a lot of information from was written by a famous scientist.
Who is the boy (that/whom) you were talking with a moment ago?
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