定語從句在句中做定語，修飾一個名詞或代詞，被修飾的名詞，片語或代詞即先行詞。下面本站小編為大家精心整理的高三英語定語從句知識點歸納，歡迎大家閱讀與學習!
定語從句
(一)基本概念
1.由一個句子作定語，修飾句中一個名詞或代詞，有時也可以修飾整個句子或句中的'部分內容，這樣的從句就是定語從句，被其修飾的名詞或代詞叫先行詞。
2.關係詞分為兩大類，即關係代詞和關係副詞，其作用一是引出一個定語從句，二是代替其所修飾的先行詞，三是在句中充當某個句子成分。
關係詞的分類和基本用法
表一
分類指代引導詞
關係代詞人who, whom, that, as
事物which, that, as
人或物(表所屬關係)Whose
關係副詞地點Where
時間When
原因Why
表二
關係代詞指代例句解釋
who人The man who helped you is Mr White.在定從中作主語
whomThat is the person(whom/who/that) you want to see.在定從中作賓語，可省略
whoseHe is the father whose son studies very well in our class.在定從中作定語
thatI´m not the fool that you thought me to be.在定從中作表語
asHe is such a lazy man as nobody wants to work with.在定從中作賓語
that事物The only thing that we can do is to give you some advice.在定從中作賓語
whichA dictionary is a useful book which tells us the meaning of words在定從中作主語
whoseHe lives in a room whose window faces south在定從中作定語
asIt is such a big stone as nobody can lift.在定從中作賓語
整句內容As is known to all, he is the best student.在定從中作主語
表三
關係副詞指代例句解釋
when時間Would you suggest a time when we can have a talk?在定從中作狀語
where地點The house where they live is not very large.在定從中作狀語
why原因This is the reason why he did not came to the meeting.在定從中作狀語