No有两种词性.
一、形容词：用来修饰名词,表示以下几种意思——
1.没有,如：
No words can describe the scene.任何言词均不能描绘那景色.
No one can do it.没有人能作此事.
2.很少,很小
No two men think alike.人心各异(一个人一条心).
They finished the task in no time.他们一下子就完成了任务.
It's no distance to the post office.到邮局没有多少路.
3.并非,绝不是
He is no fool.他很精明.
He is no scholar.他根本不是(一个)学者.
二、副词,有以下用法——
1.表示否定的回答：不,不是 (yes 之对)
--Do you smoke?--No,I don't.你抽烟吗?不,我不抽烟.(注意回答否定式问句时Yes和no的译法)
You haven't finished reading this book,I suppose?--No,I haven't.你没看完这本书吧?是的,我没看完.
--lsn't this book yours?--Yes,it is.这本书不是你的吗?不,是我的.
2.用在形容词、副词的比较等级前：并不,毫不
Joe was no richer than his friend.乔并不比他的朋友富.[乔和他的朋友一样穷.] (比较:Joe was not richer than his friend.乔比不上他的朋友富.)
We went no farther than the bridge.我们走到桥头就不再往前走了.
The sick man is no better.那病人一点也没有好转.
We can wait no longer.我们不能再等了.
3.表示惊奇或怀疑
He left yesterday.--No!他昨天走了.
4.和nor或not同用加强否定语气
I don't believe it,no,not I.我不相信这事,不,我才不信哩.
A man could not lift it,no,nor half a dozen.一个人是举不起来的,不,六个人也举不起来.
5.用于委婉的说法中：不,并非
in no small measure 在很大程度
in no uncertain terms 用十分明确的言词
6.用于or之后代替not：…与否,不管,是否
Whether or no (=not) it is true remains a question.到底是真是假还是一 个问题.
We must stick to our promise whether or no (=not).不管怎样,我们心须遵守诺言.
