系代词在从句中充当主语、宾语、定语(whose, which)。
表示人用who, whom, that, whose;
表示物用which, that, whose.
注：that, whose即可以表人，也可以表物；which可以指代前面整个句子；介词后宾语表人用whom,表物用which,表所有格用whose.
例句：
表人：
The girl who/that is standing at the gate is an English teacher.
The girl whom/who/that Peter is talking to is a teacher.
=>The gril to whom Peter is talking is a teacher.
注：介词前置后，表人时将只能用whom，不能用who或that.
The girl whose mother is a nurse is a teacher.
表物：
The book whose cover is missing is very funny.
=>The book, the cover of which is missing, is very funny.
The room whose door faces south is very bright.
=>The room, the door of which faces south, is very bright.
The book that/which belongs to me is missing.
I don't like the novel that/which you are reading.
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