1、指人的關係代詞：who, whom, whose, that 的用法：
(1)作主語(who, that )
Those who are going to play in the match are to meet at the gate at 1:30 after lunch. 那些參加比賽的人午飯後1：30在大門口集合。
在本句中，先行詞是those；關係代詞who引導定語從句，同時代替先行詞在從句中擔任動詞are going to play 的主語。
The man who/that is talking with Mr. Wang is a famous doctor. 正在和王先生說話的那個人是一個有名的醫生。
在本句中，先行詞是the man；關係代詞who/that引導定語從句，同時代替先行詞在從句中擔任動詞is talking的主語。
這個複合句可以還原成兩個句子：The man is a famous doctor. He is talking with Mr. Wang.
(2)作賓語包括作介詞賓語(whom, that )。此種情況下的關係代詞可以省略；
This is just the man(whom/that) I want for the job. 這正是我要的做這份工作的人。
在本句中，先行詞是the man;關係代詞whom/that 引導定語從句，同時代替先行詞在從句中擔任動詞want 的賓語。
Is he the manager (whom/that) you are looking for? 他是你在找的那位經理嗎？
(3)當關系代詞緊跟介詞作介詞賓語時，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. 我從中得到許多有用信息的那本書是一位著名科學家寫的。
Who is the boy with whom you were talking a moment ago. 你剛才和他說話的那個男孩是誰?
I know the young couple from whose house the music is coming. 但是當介詞放在從句末尾時，作為介詞賓語的關係代詞可以用that 並且可以省略。
如上面兩句可改為：
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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