关系代词引导的定语从句

　　关系代词所代替的先行词是人或物的名词或代词，并在句中充当主语、宾语、定语等成分。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持一致。

　　1)who, whom, that

　　这些词代替的先行词是人的名词或代词，在从句中所起作用如下：

　　Is he the man who/that wants to see you?

　　他就是想见你的人吗?(who/that在从句中作主语)

　　He is the man whom/ that I saw yesterday.

　　他就是我昨天见的那个人。(whom/that在从句中作宾语)

　　2) Whose 用来指人或物， cover is green.　请递给我那本绿皮的书。

　　3)which, that

　　它们所代替的先行词是事物的名词或代词，在从句中可作主语、宾语等，例如：

　　A prosperity which / that had never been seen before appears in the countryside. 农村出现了前所未有的繁荣。(which / that在句中作宾语)

　　The package you are carrying is about to come unwrapped. 你拿的包快散了。(which / that在句中作宾语)