3肯定句、否定句-疑问句.ppt

陈述句：肯定句、否定句
疑问句： 一般疑问句特殊疑问句
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专项练习
----句型转换
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一、肯定句变否定句
1、句子中有be, 在be 后加not.
1) I am a student.
2) They are blue.

3) He is Tom.
I am not a student.
They aren’t blue.
He isn’t Tom.
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2、句子中有can, 在can 后加not.
He can swim.
He can’t swim.
I can play football.
I can’t play football.
We can speak English.
We can’t speak English.
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3、谓语动词是动词原形，在动词前加don’t.
1) I have a book.
I don’t have a book.
2) They like Chinese.
They don’t like Chinese.
3) We come from China.
We don’t come from China.
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4、谓语动词 是第三人称单数，在动词前加doesn’t, 后面的动词用原形。
1）She has a small mouth.
She doesn’t have a small mouth.
2) Maria likes China.
Maris doesn’t like China.
3) Jane comes from the USA.
Jane doesn’t come from the USA.
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练习：将下列句子变成否定句
1. I am a teacher.
2. We are students.
3. Jane is a girl.
4. They like English.
5. I come from China.
6. We know Maria.
7. He likes Chinese.
comes from
England.
____ ____a teacher.
_______students.
______ a girl.
_____ like Chinese.
______come from China.
______know Maria.
________ like Chinese.
8. Amy ______ come from
England.
am
aren’t
not
don’t
don’t
doesn’t
isn’t
doesn’t
don’t
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陈述句
1、陈述句：
肯定句
I’m a student.
I can swim.
I know.
He knows.
定义:
陈述一个事实或说明一种情况，句末用句点。陈述句分肯定句和否定句。
否定句
I’m not a student.
I can’t swim.
I don’t know.
He doesn’t know.
肯定句变否定句的方法
在be 动词(is,am,are,was,were)
助动词(do, does, did,),
情态动词(can)
后加not.
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二、肯定句变一般疑问句
1、句子中有be, 把be 提到句首。
1）I am a student.
Are you a student?
2) They are blue.
Are they blue?
3) He is Sam.
Is he Sam?
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