高中英语丨定语从句考点大集合，都在这里了

()关系词的作用①替代前面的先行词（替代作用)②连接主句和定语从句（连接作用)③在定语从句中作句子成分（成分作用)(2)关系词的分类①标准：根据关系词在从句中做的句子成分种类②关系代词：在从句中做主，宾，表，定(that/which/who/whom/whose/as)③关系副词：在从句中作状语(When/where./why)3.定语从句：用来做定语，修饰限定先行词的句子三、定语从句的分类1.限制性定语从句：对先行词起限定修饰作用。He is a teacher who works at our school.2.非限制性定语从句：对先行词起补充说明作用（先行词与定语从句之间有逗号隔开)Beijing,which is the capital of China,is a beautifulcity with a long history.比较：He has two sons,who work in the same company.(He has only two sons.He has two sons who work in the same company.(Perhaps he has two more sons)