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一.not 表示否定1. 句型为主语＋联系动词be+表语：在be（am／are／is/was/were）后面加 not 即构成否定句。I am not hungry. 我不饿。I'm not a programmer. 我不是程序员。You are not a lawyer. 你不是律师。They are not Americans 他们不是美国人。It is not a violin. 它不是小提琴。I was not in London at the time. 我那时不在伦敦。My father was not at home yesterday. 我父亲昨天不在家。We were not satisfied with them. 我们对他们不满意。2. 句型为主语＋助动词（be， have和will）+谓语动词：在（be， have和will）后面加 not 即构成否定句。They are not playing chess. 他们不是在下棋。（现在进行时）She is not watching TV. 她不是在看电视。（现在进行时）We are not studying English. 我们不是在学英语。（现在进行时）I was not reading when she was listening to music. （过去进行时）她听音乐时，我没在看书。They were not watching the football match then. （过去进行时）他们那时没在看足球赛。He is not going to come to the party.（一般将来时）他不会来参加派对。They will not help their parents clean up. （一般将来时）她们将不帮父母搞卫生。I have not heard from John for a long time. （现在完成时）我好久没有收到约翰的来信了。She has not read today’s newspaper. （现在完成时）她还没有看今天的报纸。They have not seen that movie on television. （现在完成时）他们还没看过电视上的那部影片。She hadn't been to New York before her parents moved there.（过去完成时）她父母搬到纽约前，她没到过那。3. 句型为主语＋情态动词（can,could,may,might,must,should等）+谓语动词：在情态动词（can,could,may,might,must,should等）后面加 not 即构成否定句。She could not help laughing.她禁不住笑了起来。The old man cann't read and write.
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英语否定句写法如下：
1、简单句中含有系动词be、情态动词和助动词时，变否定句时需在系动词be、情态动词和助动词后加not。
2、简单句中谓语动词为行为动词时，要根据时态选用do的相应形式，把肯定句变为否定句。
3、祈使句变否定句时，一般在句首加Don't，但Let us或Let's开头的祈使句在Let us或Let's后加not即可。
4、主从复合句中，主句是I think，I believe等结构，变否定句时，形式上否定主句，实际上否定从句。
5、“had better＋动词原形”，变否定句时为“had better not＋动词原形”。
6、动词不定式变否定式时，常在不定式to前加not。
7、使役动词和感官动词（make，let，hear，see，watch等）后接省略to的不定式，此种不定式变否定句时只需在省略to的动词原形前加not。
8、特殊形式的否定句：肯定句中含有always，usually和ever时，变否定句时改为never。
京京魅力
英语语法中否定句分为九种:
(1)一般否定句
I don't know this.否定句式
No news is good news. 否定词no
There is no person smoking here.
(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.
He is no longer a boy.
