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否定句及一般疑问句

句型转换
肯定句变否定句及一般疑问句
一、肯定句变否定句
1、含有be动词的否定句
规则:在be动词后+not.
(is not可缩写成isn’t ;are not可缩成aren’t,但am 与not不可缩写)
eg:
肯定句:I am a student.
否定句:I am not a student.
肯定句:She is my sister.
否定句:She isn’t my sister.
肯定句:They are my parents.
否定句:They aren’t my parents.
2、含情态动词的否定句
规则:在情态动词后+ not
(can not 可缩写成can’t ,must not 可缩写成mustn’t )
eg:
肯定句:I can spell “English”.
否定句:I can’’t spell “English”.English”.
肯定句:I must find it.
否定句:I mustn’t find it.
3、含有实义动词的句子的否定句构成
(1)第三人称单数做主语。

(he、she、it或表示单个人或物的第三人称名词)
规则:要在行为动词前加上助动词doesn’t,然后将动词恢复原形。

eg :
肯定句:He has a soccer ball.
否定句:He doesn’t have a soccer ball.
(2)其它人称做主语
规则:在行为动词前加don’t ,句子中的行为动词用原形。

eg:
肯定句:They like bananas.
否定句:They don’t like bananas.
注:(1)在变否定句时,如遇some应变any Here are some books.
Here aren’t any books.
二、肯定句变一般疑问句
1、含有be动词的句子变一般疑问句
规则:把be动词提至句首,第一人称变第二人称,句末句号变问号。

(I/we变成you
My/our变成your)
肯定句:I am a student.
一般疑问句:Are you a student?
肯定句:She is my sister.
一般疑问句:Is she your sister?
肯定句:They are my parents.
一般疑问句:Are they your parents?
2、含有情态动词的句子变一般疑问句
规则:把情态动词提至句首,第一人称变第二人称,句末句号变问号。

(I/we变成you
My/our变成your)
eg:
肯定句:I can spell “English”.
一般疑问句:Can you spell “English”.(2)肯定句:I must find it.
一般疑问句:Must you find it?
3、含有行为动词的句子变一般疑问句变法
(1)第三人称单数做主语
规则:如果主语是单数第三人称,那么变成一般疑问句时,须在句首加助动
词does,然后将动词恢复原形;
eg :
肯定句:He has a soccer ball.
一般疑问句:Does he have a soccer ball?. (2)其它人称做主语
如主语是其它人称,则须在句首加助动词do,动词仍是原形。

eg:
肯定句:They like bananas.
一般疑问句:Do they like bananas?
注:
(1)如句中有some ,变成一般疑问句时应变成any。

(2)如果句中有第一人称的词,变成一般疑问句时须变成相应的第二人称。

比如:I变成you ,we变为you, my变为your, our变成your。

eg:
I have a new book.
Do you have a new book?
Here are some apples.
Are here any apples?
(3)一般疑问句的回答有肯定回答、否定回答两种,回答时用人称代词。

构成:Yes/No,
Be动词/be动词+not
人称代词+ 情态动词/情态动词+not
助动词do、does、did/don’t、doesn’t、
didn’t
eg:
Is he a teacher?Yes, he is
Can he play baseball?
Yes ,he can No ,he can’t
Does he watch TV every day?
Yes, he does. No, he doesn’t.
Assignment
将下列句子变为一般疑问句和否定句
1. We like bananas.
2..She wants to buy a hat.
3.The keys are on the table.
4.He can speak English.
5.She went to the park yesterday.。

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