一、 概念
在句子中起定语作用、修饰句中的名词或代词的从句称为定语从句，被修饰的名词或代词成为先行词。定语从句由关系代词（which，that，who，whom，whose）或关系副词（when，where，why）引导。
二、 例句
1. The flowers which I grew in the garden last month will bloom soon.
2. The man who telephoned me just now is a writer. This is the place where my mother was born.
三、 关系代词的选择
1. 充当主语的关系代词 关系代词在限定性定语从句中作主语，who 用于人，which用于物，that既可以指人可以指物。
2. 充当宾语的关系代词 关系代词在限制性定语从句中作谓语动词宾语，who ,whom 用于指人，which用于指物。that 既可以指人，也可以指物。在非正式文体中可省略。The suit(which/that) the tailor suited for me doesn’t fit me.
3. 作介词宾语的关系代词 在限制性和非限制性定语从句中，关系代词作介词宾语，whom 用于指人，which用于指物，不能用that. The man with whom you shook hands just now is head of our department.
四、 辨析
常用that 的几种情况
1. 先行词前含形容词最高级、序数词或only作第一文库网修饰语. This is the best film that has ever been made.
2. 先行词前含不定代词，如all ，anything，nothing，little，much等。
That is all (that) I want to say.
3. 先行词为人和物的名词组。
They talked of persons and things that they remembered in the school.
五、 关系副词的选择
When 和 where 可以用于限制和非限制性定语从句中，why只能用于限制性定语从句中。它们在从句中分别作时间、地点和原因状语，其结构相当于“介词+关系代词”.
1. I still remember the day when/on which we firstmet.
2. The city where /in which I was born is on the newrailway line. This is the reason why/for which he left school.
定语从句 练习题
1. The doctor _______ is leaving for Africa next month.
A. the nurse is talking to him
B whom the nurse is talking
C whom the nurse is talking to
D who the nurse is talking
2. I don’t like such a person ____ often lies before your face.
A .what B. that C. as D. which
3. This is the very boy ____ I have been looking for.
A. which B. what C. who D. whom
4. He talked about the people and things ____interested him greatly during his stay here.
A. which B. that C. who D. they
5.(双选) Carmen likes musicians ____play different kinds of music.
A. who B. whom C that D. which
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