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各种从句的构成和意义---定语从句与英语中的其他定语结构 相关背景知识介绍： 在英语中能充当定语的角色很多，如：不定式结构，介词结构，动名词，分词，名词，形容词/复合形容词和定语从句。但这些结构在作定语时位置却未必都在所修饰词的前面，如： On the next其次的floor, there are three rooms named after the colors that are used in them: the Red Room, the Blue Room, and the Green Room. The walls are covered with silk cloth. There are many pieces of old furniture, from the time when the White House was first built. l 定语从句 在复合句中修饰名词或代词的从句称为定语从句。被定语从句修饰的词叫先行词，定语从句必须放在先行词之后。 引导定语从句的词有两类： 1、 关系代词：which, that, who, whom, whose 2、 关系副词：when, where, why Ⅰ关系代词引出定语从句 which, that代替事或物，在从句中做主语或宾语。Who, that代替人，在从句中who做主语，whom作宾语。Whose代替人或物，在从句中做定语。如： 1. The road which leads to the small town has been widened. 通往小镇的那条路已经加宽了。 | 
