定语从句在句中做定语，修饰一个名词或代词，被修饰的名词，词组或代词即先行词。下面本站小编为大家精心整理的高三英语定语从句知识点归纳，欢迎大家阅读与学习!
定语从句
(一)基本概念
1.由一个句子作定语，修饰句中一个名词或代词，有时也可以修饰整个句子或句中的'部分内容，这样的从句就是定语从句，被其修饰的名词或代词叫先行词。
2.关系词分为两大类，即关系代词和关系副词，其作用一是引出一个定语从句，二是代替其所修饰的先行词，三是在句中充当某个句子成分。
关系词的分类和基本用法
表一
分类指代引导词
关系代词人who, whom, that, as
事物which, that, as
人或物(表所属关系)Whose
关系副词地点Where
时间When
原因Why
表二
关系代词指代例句解释
who人The man who helped you is Mr White.在定从中作主语
whomThat is the person(whom/who/that) you want to see.在定从中作宾语，可省略
whoseHe is the father whose son studies very well in our class.在定从中作定语
thatI´m not the fool that you thought me to be.在定从中作表语
asHe is such a lazy man as nobody wants to work with.在定从中作宾语
that事物The only thing that we can do is to give you some advice.在定从中作宾语
whichA dictionary is a useful book which tells us the meaning of words在定从中作主语
whoseHe lives in a room whose window faces south在定从中作定语
asIt is such a big stone as nobody can lift.在定从中作宾语
整句内容As is known to all, he is the best student.在定从中作主语
表三
关系副词指代例句解释
when时间Would you suggest a time when we can have a talk?在定从中作状语
where地点The house where they live is not very large.在定从中作状语
why原因This is the reason why he did not came to the meeting.在定从中作状语