定语从句讲解用（关系代词的Unit 1 《school life »Grammar (1)n定语从句的定义及其作用：定语从句是又称形容词性从句,在句子中起定语作用,修饰一个名词或代词，有时也可修饰一个句子.受定语从句修饰的词叫先行词.定语从句的作用和作定语的形容词、介词词组、分词词组相似，有时可以相互转换，例女口：金发女孩可译作a blonde girl ，a girl with blonde hair 或a girl who has blonde hair。
定语从句通常由关系代词that/ which/ who/ whom/ which/ as 或关系畐U词when/ where/ why引导，这些词既指代主句中要说2 / 10明的名词或代词,又充当从句中的某个句 子成分。
定语从句可分为：限制性定语从句 和非限制性定语从句。
定语从句一般都紧跟在它所修饰名词后面，所 以如果在名词或代词后面出现一个从句， 根 据它与前面名词或代词的逻辑关系来判断 是否是定语从句。
川 Th 定语从句的k 必Which was written by J.K.relative pron. （thal ativ 指人或物adVe Wh ）ich 指物 /3关系词在从句中充当成分en / where / why ）找出下列句中的定语从句；分析定语从句三要 素1. You are the right man whom we are looking for.2. I ' ve spent all the money that was given by my parents.3. I will never forget the day when I joined the party.4. This is the factory where the machines are made.IV 关系代词的用法:1先行词（名词或代词）2关系词1V课堂练习1找出下列各句中的定语从句，并分析其先行词：1 The fan that you want is on the desk.2 The woma n you saw in the park is our geography teacher.3 Here is the girl whose brother works in this shop.4 That ' s the child whose drawing we were looking at just now.5 This is the boy whose sister is a famous sin ger.2把下列每对句子合并成含有定语从句的主从复合句1. The man is in the n ext room. He brought our textbooks here yesterday.2. The magaz ine is mine. He has take n it away.3. The students will not pass the exam. They don ' t study hard.4. The letter is from my sister. I received it yesterday.5. The play was won derful. We saw it last ni ght.6. The train was late. It was going to Nanning.Grammar (2)修饰物体时关系代词that和which的区分♦使用that的情况：1■当先行词是nothing, something, anything, all,each, little, few, none, the one 等词时。
e.g. Do you have any thi ng that is importa nt totell me?2. 当先行词被all, any, some, no, not, every, each等修饰时。
e.g. I have some books that are very good. 3•当先行词被形容词最高级、序数词所修饰时。
e.g. This is the first book that I bought myself.The biggest bird that I caught is this bird.4. 主句是以which或who开头的特殊疑问句时e.g. Which is the bike that you lost?Who is the woman that was praised at the meeti ng.5. 当先行词在从句和主句中都作表语时，无论先行词是人还是物.e.g. China is no Ion ger the country that shewas.6■如有两个定语从句，其中一个已用which引导, 另一个宜用that .e.g. Edis on built up a factory which producedthings that had never been seen before.7■在there be句型中,只用that.e.g. He asked for the latest book (that) there is onthe subject.8.当先行词被the very, the last, the next, the only等词修饰时。
e.g. This is the very book that I lost yesterday.9.当先行词又有人又有物时。
e.g. I won ' t forget the things and the personsthat I saw.♦只能使用which的情况。
1、非限制性定语从句中。
e.g. She lost the game, which depressed herreally.2、在介词之后。
e.g. This is a house in which lives an old man.She has collected 600 stamps, 60% of which are Germa n stamps.7 / 103、当主句中的主语被that修饰时。
e.g. That dog which I found in the street bel ongs toMary.Fill in the bla nks with suitable relative pronouns.1. This is the on ly book _____ I got last year.2. Is this the book in ______ y ou are in terested?3. This is the largest animal _____ Tom saw in the zoo.4. Rose still remembers the trees and teachers ___________ exist （存在）in themother school.5. All the desks _______ are bought look really won derful.6. Do you have any money ____ is used to build the factory?7. Tom has a toy, _____ was give n by his father.8. This is the sec ond watch _____ my father bought for me.n修饰人时关系代词that和who, whom的区分。
1 •当主句中的主语是who时，只能用that。
e.g. Who is the girl that is standing over there?2. 在非限制性定语从句中以及介词后面时只能用who或者whom。
e.g. I have a son, who is really lovely and in teresting.There are 40 stude nts in the class, most ofwhom are boys.3. 关系代词whose既能修饰人，也能修饰物，在定语从句中充当定语，修饰先行词。
e.g. She is the girl whose English sounds verybeautiful.Mary has a very good dog, whose hair turns out white and black.♦Correct mistakes for the followi ng senten ces.1. Under the big tree are 34 students, many of them come from class two.2. My mother has a good book, which cover looks terrible.3. Who are the young girls who are hav ing dinner in the restaura nt?4. She is one of the girls who is very interested in maths.5. Tom is the only one of the boys who like playing football.6. Who is the girl that you talked to her just now?7. This is the very pen that you gave it to me before.8. There is an old woman, that is holding a stick.高考真题1: I saw a women running towards me in the dark.Before I could recog nize who she was, she hadrun back in the directi on ______________she had come.A. of whichB. by whichC. i n whichD.from which简析：考查介词+关系代词which引导的定语从句。
先行词为事物时，关系代词既可用which，也可用that，但介词后的关系代词去卩只能用which。