1找到先行词 ,就是两句重复的部分.
2 用连接词 who which that 连接并替换先行词成分.
The man is sitting in the chair.
The man is my father.
the man 重复 而且他是一个人 引导连接词用who/that
The man who is sitting in the chair is my father
看懂了吗