[思路分析]
改否定句：
方法一：找出句中的BE动词，在BE动词的后面加not(或缩写为isn’t, aren’t，但am not不能缩写)。如果句中有some,改为否定句时要变成any。
方法二：找出句中的can，在can的后面加not(或缩写为can’t)。如果句中有some,改为否定句时要变成any。
方法三：如果句中没有的BE动词和can,改否定句时要添加don’t或doesn’t。当句子的主语为第三人称单数时，就在主语后面加doesn’t，原句中的动词改为原形。除此之外都加don’t。如果句中有some,改为否定句时要变成any。
[解题过程]
（1）Green and jack don't read Lesson Five。
（2）Those boys don't repeat Lesson Five。
（3）Those girls don't open the door。
（4）It is not time to begin the class。
否定句
开放分类： 英语、语法、名词、古代、汉语
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”，可以是代词如“莫”。
英语语法中否定句分为九种：
1）一般否定句
I don't know this. No news is good news.
There is no person (smoke)/not a person/not any person (smoke) 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.
He is no longer a boy.
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