is a girl who has long hair. 先行词关系词定语从句 Mary is a girl who has long hair .关系代词关系副词 which, who, whom, whose, that Where, when ?定语从句的用法: ?当先行词是物时, 用 which 或 that 引导. These are the trees which were planted last year . ?当先行词是人时, 用 who , whom , whose , that 引导. ? who, whom, whose, that 用法区别. ? who 作定语从句的主语或宾语. The man who is speaking at the meeting is a worker. The man is a worker. The man is speaking at the meeting. 分解作主语? Whom 作定语从句的宾语 The woman whom they wanted to visit is a teacher. The woman is a teacher. They wanted to visit the woman . 分解作宾语? whose 作定语从句的定语. I know the girl whose mother is a teacher .分解 I know the girl. The girl ’s mother is a teacher. 作定语? that 可以作定语从句的主语和宾语.注意: 关系代词作动词宾语时可省略. The woman (whom/ that) they wanted to visit is a teacher.