一 . 定语从句的基本定义放在名词或代词后面，由关系代词或关系副词引导的修饰该名词或代词的从句叫定语从句。被修饰的词叫先行词。一 . 定语从句的基本定义The boy who is reading is Tom.先行词关系代词Hospital is a place where a doctor works.先行词关系副词 二 . 关系词的分类1. 关系代词 2. 关系副词关系代词在定语从句中作主语、宾语、表语和定语，常用的关系代词有： that, which, who, whom, whose关系副词在定语从句中作状语，常用的关系副词有： when, where, why三 . 关系代词的基本用法和注意点1. 关系代词的基本用法关系代词 指代的先行词充当从句的成分who人主语、宾语whom人宾语which物主语、宾语that人或物主语、宾语、表语whose人或物定语① who 指人 , 在定语从句中作主语或宾语。作宾语时，可省略。The man (who) I talked with is our teacher.A person who steals things is called a thief.②whom 指人 , 在定语从句中作宾语，可省略。 The man (whom) I nodded to is Mr. Li.③ which 指物，在定语从句中作主语或宾语。作宾语时，可省略。 These are the trees which were planted last year.This recorder （ which ） he is using ismade in Japan. He is the man (that) I told you about.④that 指人或物，在定语从句中作主语或宾语。作宾语时，可省略。A plane is a machine that can fly.⑤ whose 指人或物 , 在定语从句中作定语 。不可省略。We live in a house whose windows face south.This is the little girl whose parents were killed in the great earthquake.2. 关系代词的用法注意点(1) that 和 which 都可以指物，但以下 5 种情况只能用 that 不能用 which 。① 当先行词中有人又有物时。如： Do you know the things and persons that they are talking about?② 当先行词为不定代词 all, one, few, little, no, some, any, everything, nothing, nobody, none等时。如：This is all that I want from the school.③ 当先行词被 only, just, very, right, last 等修饰时。如：This is the very book that I am looking for these days.④ 当先行词被最高级修饰时。如：The TV tower is th...
