定语从句讲解（包含各种特殊情况对比，题目都是易错题）1）定语从句的基本概念：定语从句是用来修饰名词或代词的从句，起形容词作用，也称为形容词性从句。被定语从句修饰的词叫先行词，定语从句一般紧跟先行词。定语从句一般用关系代词或关系副词引导，关系词在定语从句中充当一个成分，并在含义上替代先行词。The man is my cousin. He came to see me this morning. 替换：The man who came to see me this morning is my cousin. 先行词 关系代词在定语中做主语，不可省略 定语从句2）关系词:关系代词（指人/指物/表所有格）;A.指人的关系代词：who,做主语或宾语；whom，只做宾语；that,做主语或宾语（但指代人称并充当从句主语时，通常用who）He is a student. We should learn from him.替换：He is a student (who, whom, that) we should
