be动词一般动词（实义动词）情态动词的否定句
I am not a student.我不是学生。
I don't know him.我不认识他。
He can't speak English.他不会说英语。
（一）be动词的否定句
a.句型：主语+be动词+not～.
I wasn't good at English.我英语不好。
He isn't hungry.他不饿。
b.进行时和被动语态（现在时、过去时、进行时）都有be动词，所以它们的否定句与be动词的否定句同形。（详见第十三章被动语态）
They aren't cleaning the room.（现在进行时）他们没在打扫房间。
The child was not looked after.（过去时的被动语态）这个孩子以前没有被照顾过。
c.将来时（will，shall）、完成时及情态动词的被动语态不能用be动词的否定句型。
They will not be sent to the front.（√）
They will be not sent to the front.（×）他们将不会被送到前线。
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英语语法练习题
（二）情态动词的否定句
句型：主语+情态动词+ not +动词原形
I cannot do it myself.我自己做不了这件事。
You mustn't take the books out.你们一定不能把书拿出去。
（三）一般动词的否定句
句型：主语+ do（does， did）+ not +动词原形
注意：否定式的缩略形
is not→isn't
are not→aren't
Was not→wasn't
were not→ weren't
do not→don't
does not→doesn't
did not→ didn't
Can not→can't
will not→ won't
must not→ mustn't
have not→ haven't
has not→ hasn't
had not→hadn't
am not无缩写形式，应为I'm not形式。
He doesn't do his homework every day.他不是每天都做作业。
They didn't have the class-meeting yesterday.他们昨天没开班会。
They don't live in Shanghai.他们不住在上海。
（四）现在完成时的否定句
句型：主语+ have（has）+ not +动词的过去分词～.
I haven't finished reading the book yet.这本书我还没读完。
He hasn't had his breakfast yet.他还没吃早饭呢。
（五）过去完成时的否定句
句型：主语+ had + not +动词的过去分词～.
He hadn't finished reading the book by the end of last month.截至上月末，他还没看完这本书。
