6、who(指人),whom(指人),whose(指人或物)和关系副词when(时间),where(地点),why(原因)。关系代词或关系副词放在先行词和定语从句之间,既起连接作用,同时又作定语从句的一个成分。eg. China is a great countrythathas about 5000 years of history. (作主语)Could you tell me something about the placesthatyou visited there?(作宾语)注意:关系代词在定语从句中作主语时,从句谓语动词的人称和数要和先行词保
7、持一致。eg.The manwholivesnext to us is a policeman.The booksthatarebought by my father are very useful.语法精要2. 关系代词的用法 指物的关系代词(1)that既可指物,也可指人,在定语从句中作主语或宾语。(2)which只指物,不指人,在定语从句中作主语或宾语。注意:that, which在定语从句中作主语时不能省略;作宾语时则可以省略。eg. It’s a book which/that introduces China in detail. (作主语