小学英语肯定句变否定句方法及练习

肯定句改否定句英语

一、肯定句改否定句的规则

1. 在动词前面加not。

2. 有be动词，将be动词提前改成否定形式。

3. 有情态动词，将情态动词提前改成否定形式。

4. 没有助动词或情态动词，需要添加助动词do或does，然后将动词改为原型。

二、肯定句改否定句的例子

1. I like English.（我喜欢英语。）

否定句：I don't like English.

2. He is a student.（他是一个学生。）

否定句：He is not a student.

3. We can swim.（我们可以游泳。）

否定句：We cannot swim.

4. They have a book.（他们有一本书。）

否定句：They do not have a book.

5. My mother is a doctor.（我的妈妈是一位医生。）

否定句：My mother is not a doctor.

6. The sun rises in the east.（太阳从东方升起。）

否定句：The sun does not rise in the east.

7. It was Sunday yesterday.（昨天是星期天。）

否定句：It was not Sunday yesterday.

1 英语语法：肯定句如何变为否定句？

一、陈述句、肯定句、否定句、肯定陈述句、否定陈述句、祈使句

•陈述句：Lily is a student. •祈使句：Open the door.

•肯定句：Lily is a student. •否定句：Lily is not a student.

•肯定陈述句：Lily is a student •否定陈述句：Lily is not a student.t

二、动词：一般表示动作或者状态

Be动词:is、am、are

情态动词：can、should、will、may、must、need

助动词: do、does(第三人称单数）

实义动词： have、has（第三人称单数）

三、动词+not 的缩写

Be动词+not缩写 is not isn’t

am not 一般不缩写

are not aren’t

情态动词+not 缩写 can not can’t

should not shouldn't

will not won’t

may not mayn't

must not mustn't

need not needn't

助动词+not缩写 do not don't

does not doesn’t

have/has + not缩写 have not haven’t

has not hasn’t

三、肯定句改为否定句

（1）肯定句改为否定句：找到Be动词，在后面加not。

找到Be动词：is、am、are，在Be动词后面直接加not，变成is not,am not ,are

not，或缩写成isn’t,am not,aren’t

例如：

肯定句1：Amy is a good girl. 否定句1：Amy is not a good girl.

肯定句2：I am a student. 否定句2：I am not a student. 2 肯定句3：These flowers are very beautiful.

1 肯定句改否定句和一般疑问句

一、实义动词

He often goes to bed at ten.

We do eye exercises every day.

She came to Japan in 1990.

二、系动词

I am your friend.

Her mother is a teacher.

There are two books on the desk.

Yesterday was July 1, 1995.

They were in Beijing in 1990.

三、进行时

The girl is standing at the station.

The students are playing basketball on the playground.

.

I am looking for a dog.

四、情态动词

Lucy will be back in four days.

You can use this dictionary.

You need go tomorrow.

You should study hard..

将下列陈述句变为否定句和一般疑问句。

1. He found his pen under his desk.

2. We must go to the meeting right now.

3. I wrote him a letter last week.

4. My sister sings beautifully.

5. Mary missed the bus.

6. This bus will take you right to the city.

7. They are doing questions and answers with the

teachers.

8. My father has his lunch at 11:30 everyday.

句型转换的方法（一）

一、 肯定句改否定句的方法——一步法

1、 在be动词后加not。如：is not ， are not ， am not， was not， were not；

例如：He is in the classroom. (改为否定句）

He is not ( isn’t ) in the classroom.

2、 在can，should， will等后加not。如：can not， should not， will not；

例如： Mike can sing English songs. ( 改为否定句）

Mike can not ( can’t ) sing English songs.

3、 上述都没有的，在动词前加助动词否定形式don’t/doesn’t/didn’t。

例如： I like pizza. ( 改为否定句）

I don’t like pizza.

4、 句中有some 的要改成any。

例如 ： There are some books on the desk. ( 改为否定句）

There are not ( aren’t ) any books on the desk.

二．实战演习: 把下列各句改为否定句

1. John is walking in the park.

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2. Tom and Marry are friends.

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3. I’m a student.

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4. She will go to Beijing tomorrow,

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