定语从句关系词的用法与选择 ■关系词的用法 关系词分关系代词和关系副词。关系代词主要有 that, who, whom, whose, which, as 等,其中who和whom 只用于指人,which和as 只用于指事物,whose和 that既可于指人也可用于指物,它们在定语从句可用作主语、宾语、表语或定语;关系副词主要有when, where 和why,其中when表示时间,where表地点,why表原因,它们在定语从句中均用作状语: A plane is a machine that can fly. 飞机是一种能飞行的机器。(that指物,在从句中用作主语)http://yingyu.chazidian.com I have forgotten everything that I learnt at school. 我把学校学的所有东西都给忘了。(that指物,在从句中句作宾语) The man who lives in that house is my uncle. 住在那座房子里的人是我叔叔。(who指人,在从句中作主语) The house whose windows are broken is empty. 破了窗户的那座房子是空的。(whose指物,在从句中作定语) There are some students whose questions I can’t answer. 有些学生提出的问题我回答不了。(whose指人,在从句中作定语) He is not such a fool as he looks. 他并不像他看起来那么傻。(as指人,在从句作表语)