英语怎么改成否定句

简单地说就是在动词后面加not，有is、am、are的句子会在这些词后面加not，I am(not)a boy。没有is、am、are的句子会在动词前加don't或者do not，I（don't）like basketball。如果有must、may、can这类的词，在这类词后面加not，I can （not）walk。根据句子的不同情况进行改动。

否定句是表示否定的句子。必须有否定词，古代汉语中否定词可以是副词“不”、“弗”、“毋”、“勿”、“未”、“否”、“非”，可以是动词如“无”。

否定句分类

1一般否定句

I don't know this. No news is good news.

There is no person（smoking）/not a person/not any person（smoking）in the house.

2特指否定

He went to his office, not to see him.

I am sorry for not coming on time.

I don't think/believe/suppose/feel/imagine you are right.

3部分否定

All the answers are not right

All is not gold that glitters

I don't know all of them.

I can't see everybody/everything.

Both of them are not right.

4全体否定

None of my friends smoke.

I can see nothing/nobody.

Neither of them is right.

Nothing can be so simple as this.

5延续否定

You didn't see him, neither/nor did I.

You don't know, I don't know either.

He doesn't know English, let alone/to say nothing of/not to speak of（更不用说）French.

6半否定句

We seldom/hardly/scarcely/barely hear such fine singing.

I know little English. I saw few people.

7双重否定

You can't make something out of nothing.

What's done cannot be undone.

There is no sweet without sweat.

No gain without pains.

I can't help/keep/laughing whenever I hear it.

No man is so old but（that）he can learn.

8排除否定

Everyone is ready except you.

He did nothing but play.

But for your help, I couldn't do it.

9加强否定

I won't do it at all.

I can't see it any more.