定义：
- 所谓关系代词，就是指用于引导定语从句的代词。之所以把这类代词叫做关系代词，是因为它们具有关联作用，能把所引导的从句与从句所修饰的词语来自（即先行词）联系起来。
- 英语中常用的关系代词有：见布走速which、that、who、whom、whose。根据这些代词在句中的句法功能，可以信父谈别由序左苗族把它们分为主格、宾你问格和所有格三类。
- 主格：which、that、who宾格：which、that、who、whom所有格：whose
which：
- which引导定语从句时宗，在从句中既可以作主语，也可以做宾语。如：Yesterday I lost the book which my English teacher had 波带事压远绿垂希你投未given me as a birthday gift. （作宾语）Yesterday I lost the book which had been given 序山考殖附称配土矛屋to me by my English teacher as a birthday gift. （作主语）
- 当which在从句中作宾语时，可以省略。如：Yesterday I lost the book my English teacher had given me as a birthday gift.
- which也可以用来连接非限定性定语从句。如：Yesterday I left Alice Springs, which is a small tow儿探扬罗周宁伯游限万n in the center of Australia.
- which可以与介词一起使用，在从句中作状语，相当于一个关系副词。如：Yesterday I left 唱却逐房Alice Springs, in which there is a big desert park.
that：
- that引导定语从句时，在从句中既可以作主语，也可以作宾语。如：This is the dictionary that has helped me a lot in my Englis服拿觉有h study. （作主语）This is the dictionary t缩奏减眼便愿坐德hat you are looking for. （作宾语）
- 当t裂牛hat在从句中作主语时，经常可以用which来替换。如：This is the dictionary which has helped me a lot in my English study.
- 督衣月防当that在从句脸物兵中作宾语时，也可以用which来替换，而且经常会省略。如：This is the dictionary you are looking for.
- that不能引导非限定性范定语从句。如：错误：This is the dictiona诉ry, that cost me five dollars.句中的that要改为which。
who：
- who引导定语从句时，在从句中一般作主语。如：He is the man who called me four times yesterday.
- who有时也会在从句中作宾语，相当于whom。如：He is the man who you talked about yesterday.
- who也能用来引导非限定性定语从句。如：His brother, who is a teacher, is al什前超围帝ways kind to others.
whom：
- who问菜请后类兵脚含始据m是who的宾格形式，在定语从句中只能作宾语。如：She is the woman whom I served just now.
- 如果whom紧跟在介词后面，则不能省略。如：She is the woman to whom I talked just now.
- whom也可以用来引导非限定性定语从句。如：The doctor, whom you admire, will visit our hospital tomorrow.
whose：
- 因为whose是所有格形式，表示所属关系，所以在实际使用中，whose后面会紧跟一个名词，才能引导定语从句。如：She lives in a room whose window opens to the north.
- “whose+名词”也可以引导非限定性定语从句。如：The driver, whose back was badly injured, was sent to the hospital nearby at once.
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