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一．定义：在复合句中修饰某一名词或代词的从句加定语从句。 二．定语从句的特点： 1.先行词：定语从句所修饰的名词或代词 2. 关联词：1）引出定语从句，并作从句的一个成分。可作主语、宾语、定语、状语， 作宾语可省略。 2）关联词包括关系代词和关系副词。关联词位于先行词和定语从句之间。 关系代词：that,which,who,whom,whose，代指先行词。 关系副词：when，where，why，作时间状语。 三．基本结构：先行词+关联词+定语从句 四．关系代词的用法： 1. that 和which that指人或物，作主语或宾语，作宾语可省略，主语不能。 Which指物，不指人，作主语或宾语，作宾语可省略，主语不能。 His father works in a factory that/which makes Tvsets. Who was hurt in the accident that/which happened yesterday? The coat (which/that) I put on the desk is black. 注意：The room in which I live is very big.(在介词后面不能用that) 2.只能用that不能用which引导的定语从句： 1) 先行词被形容词最高级修饰时，定语从句只能用that This is the most interesting story (that) I have ever heard. | 
