人教版九年级全一册
Unit 9定语从句 语法精讲
Step 1 Lead-in
1）I have an apple.
I have a red apple.
I have a red apple that my mom bought for me.
（初步理解何为定语）
2）1.Tom is a handsome boy.
2.His name is Tom.
3.The two boys are students.
4.The smiling boy needs a pen.
5.The boy to write this letter needs a pen.
6.The girl behind the tree is Kate.
定语是在句中用来修饰名词或代词的词、短语或句子等。
可以前置，也可以后置。
Mary is a beautiful girl.形容词作定语
Mary is a girl with long hair.介词短语做后置定语
Mary is a girl who has long hair.句子作定语,修饰girl, 叫做定语从句。
Step 2 Presentation
定语从句是指在复合句中修饰某一名词或代词的从句。
被定语从句修饰的名词或代词叫先行词。
用来引导定语从句的词叫关系词。分为关系代词和关系副词。
Step 3 Practice
Step 4 Extension
that与which的区别
在先行词是物的定语从句中，一般情况下that和which都可以通用, 但在下列情况下, 一般用that而不用which。
先行词为all, everything, nothing, something, anything, little, much等不定代词时；
I am sure she has something that you can borrow.
2. 先行词被all, little, much, every, no 等修饰时；
I’ve read all the books that are not mine.
先行词被序数词或最高级修饰时；
This is the first book that he has read.
4. 先行词被the only, the very, the same,the last修饰时；
This is the very book that belongs to him.
5.先行词为人和物的组合；
They talked for an hour of things and persons that they remembered in the school.
6. 若主句中有疑问代词who或者which, 为了避免重复, 关系代词不要再用who, which，而用that。
Which of the books that you borrowed from the library is the most interesting
注意：
关系代词在定语从句中作主语时，从句中的谓语动词要与先行词的数保持一致。
Do you know the men who are playing basketball
(此句中先行词men是复数名词，故从句谓语动词用复数形式)
Step 5 Summary
