1.主语+系动词be+not+表语
I am not a teacher.我不是一名老师。
They were not late for school yesterday morning.昨天早上他们上学没有迟到。
2.主语+do/does/did+not+实义动词+其他
We do not have any apples in the fridge.我们的冰箱里没有苹果了。
He does not like swimming.他不喜欢游泳。
They did not do their homework last night.他们昨晚没有做作业。
3.主语+助动词/情态动词+not+实义动词+其他
I have not finished my homework.我还没有完成作业。
You should not stay up too late.你不该熬夜。
I won’t have finished the journey by next week.下周前我还未结束行程。
【提示】 变否定句时把第一个助动词变为否定形式。
4.主语+never，hardly，scarcely，seldom，rarely+实义动词
He never smokes cigarette.他从不抽烟。
I hardly know the people there.我几乎不认识那里的人。
She scarcely spoke to him.她很少跟他交谈。
5.否定代词few，little，nothing，nobody，none，no （adj.）作主语或宾语
Nobody will agree to this project.没有人会同意这项计划。
I can do nothing about it.对这事我无能为力。
I have little time for reading.我几乎没有时间看书。
No students will take the course.没有学生会选修这门课。