1.先行词指人，在定语从句中作主语，用who/that,并且不能省略
She is the girl . The girl lives next door. 定语从句 She is the girl who/that lives next door.
她就是住在隔壁家的女孩。 2.先行词指人，在定语从句中作宾语，用whom/who/that,可以省略
4.This is the school ( ) we visited yesterday. A. who B. which C. where D. whose
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5.先行词指人或者物，并且在定语从句中作定语，用 whose/of whom/of which.
I know the boy. The boy’s father is a policeman. I know the boy whose father is a policeman. I know the boy the father of whom is a policeman. This is the house . The house’s window faces south. This is the house whose window faces south.
A. which B. that C. whom D. as
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定语从句时特别注意的几个问题
1）只能用that的情况： ①先行词为不定代词all, anything, nothing, everything …； e.g. There is nothing that can prevent him from doing it. 没
这就是面朝南的那个房子。
This is the house the window of which faces south. This is the house of which the window faces south.
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6.as引导定语从句时的用法 as引导定语从句通常用于the same .. as, such … as结构中 Such+ 名词+as…像。。。一样的，像。。。之类的
He is such a clever boy as everyone likes.
他是一个人人都喜欢的聪明的男孩
He is such a clever boy that everyone likes.
他是一个如此聪明的孩子以至于人人都喜欢他。
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3. Tom did not take away the camera because it was just the same camera ____ he lost last week
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③先行词有only, very, any, one of , few, no, little, much 等表 示程度词，不定代词修饰.
Mr. Smith is the only foreigner that he knows. 史密斯先生是 他认识的唯一的外国人.
This is the very dictionary that I want to buy. There was little that I could do for you.
The work is very important. The work has just been finished. The work that/which has just been finished is very
important.
刚刚完成的那份工作非常重要。
4.先行词指物，在定语从句中作宾语，用which/that,可以省略
Talk to sb. The man whom you talked to just now is a worker.
10. The man ____ you are going to make friends is my
father’s neighbor.
A. with whom B. when C. to whom h
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什么是定语从句？
定语从句就是由关系代词和关系副词引导的从句，并 且作定语修饰主句中某一名词或代词。 被修饰的名词或者代词 称为先行词
关系代词和关系副词必须位于主句先行词之后，定 语从句之首
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关系代词
That Which Who Whom Whose
As
先行词（被修饰的词） 在定语从句中的成分
D. whic
Make friends with sb.
That is the girl. I teach the girl. That is the girl whom/who/that I teach.那个就是我教的女孩。 That is the girl I teach.
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3.先行词指物，在定语从句中作主语，用which/that,并且不能省略
定语从句
主讲人 Sophie
Tom has a book. The book is given by our English teacher. 定语从句 Tom has a book that is given by our English teacher. I still remember the day. On that day I first met her. 定语从句 I still remember the day when I first meet her.
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用 which, who, whom而不用 that的情况：
①引导非限制性定语从句 逗号之后不能用that； e.g. He had failed in the math exam, which made his father very angry.
他数学考试没有及格，这使他的父亲很生气。
4. We'll reach the sales targets in a month _____ we set at the beginning of the year. (2014年重庆高考真题)
A. which B. where C. when D. what
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9. The man ____ you talked just now is a worker. A. who B. whom C. to whom D. to who
This is the book. I want to read the book . This is the book which/that I want to read. 这就是我想读的一
本书。
This is the book I want to read.
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1. The man ____ visited our school yesterday is from London. A. who B. which C. whom D. when
④先行词既有人又有物 Do you know the things and persons that they are talking about?
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⑤主句已有疑问词who , which 时 只用that. Which is the bike that you lost? Who is the woman that was praised at the meeting?
Such + as 像。。。一样的，像。。。之类的 The same+名词+as… 和。。同样的
e.g. I want the same shirt as my friend’s.
我要一件跟我朋友一样的衬衫。
He is not the same man as I knew.他不是我过去认识的那个人了 This book is not such as I expect. 这不是我想要的书。
2. The woman ____ is talking to my mother is a friend of hers. A. whose B. who C. whom D. which
3.The woman ____ is walking on the playground is my old friend. A. / B. who C. whom D. which
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1.This is the man ( ) I met yesterday. A. / B. which C. where D. whose
2.This is the man ( ) I met yesterday. A. whom B. which C. when D. whose
3.This is the school ( ) we visited yesterday. A. / B. who C. where D. whose
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介词 + 关系代词，并且有逗号 There are many students in the classroom. Most of them are boys. 定语从句 There are many students in the classroom, most o
f whom are boys. I have a lot of books, most of which are English books.
有什么能阻止他不干那件事。
②先行词有最高级修饰the most, the best， 有序数词修饰the first, the second.