РMary is a girl.РMary has long hair.Р合并为一个句子РMary is a girl who has long hair.Р先行词Р关系词Р定语从句РMary is a girl who has long hair.Р关系代词Р关系副词Рwhich, who, whom, whose, thatРWhere, whenР定语从句的用法:Р当先行词是物时, 用which 或that引导.РThese are the trees which were planted last year.Р当先行词是人时, 用who, whom,? whose, that引导.Рwho, whom, whose, that用法区别.Рwho 作定语从句的主语或宾语.РThe man who is speaking at the meeting is a worker.РThe man is a worker.РThe man is speaking at the meeting.Р分解Р作主语РWhom 作定语从句的宾语РThe woman whom they wanted to visit is a teacher.РThe woman is a teacher.РThey wanted to visit the woman.Р分解Р作宾语Рwhose 作定语从句的定语.РI know the girl whose mother is a teacher.Р分解РI know the girl.РThe girl’s mother is a teacher.Р作定语Рthat 可以作定语从句的主语和宾语.Р注意: 关系代词作动词宾语时可? 省略.РThe woman (whom/ that) they wanted to visit is a teacher.