.1.The man is a worker.2.The man is speaking at the meeting.合并句子合并句子:The man who is speaking at the meeting is a worker.概念概念:在复合句中修饰名词或代词在复合句中修饰名词或代词 的句子的句子.(Attributive clause)Mary is a beautiful girl.Mary is a girl who has long hair.形容词作定语形容词作定语句子作定语句子作定语,修饰修饰girl,叫做叫做定语从句定语从句.Mary is a girl.Mary has long hair.合并为一个句子合并为一个句子Mary is a girl who has long hair.先行词先行词关系词关系词定语从句定语从句Mary is a girl who has long hair.关系关系代词代词关系副词关系副词which,thatwho,whom,whose Where,when.定语从句的用法定语从句的用法:当先行词是物时当先行词是物时,用用wh