定语从句专练定义：修饰某一名词或代词的从句叫定语从句。 被定语从句修饰的词叫先行词。 The man who is shaking hands with my father is a policeman. 主句：The man is a policeman.从句：who is shaking hands with my father. 用来修饰先行词the man关系词who在定语从句中作主语The film which they went to see last night was not interesting at all. 主句：The film was not interesting at all.从句：which they went to see last night 用来修饰先行词the film关系词which在定语从句中作宾语The reason why he failed the examination is that he had not made any preparation for it.
