no one和nobody只能指代人，做主语时，谓语动词常用单数形式

No one knows what the future will be like. 没有人知道未来会什么样子的。

Nobody answered my question.没人回答我的问题。

No one(Nobody) spoke during dinner.吃晚饭时没有人说话。

none表示“没有一个，全无”，既可指代人，也可指代物。常用搭配为none of … “没有……”

In the face of danger, all the firefighters were brave and none of them gave up.

面对危险，所有的消防官兵非常勇敢，他们中无一人退缩。

None of his friends has seen his house.他的朋友中没有一人见过他的房子。

做主语时，当指代的是不可数名词时，谓语动词只能用第三人称单数形式；当指代可数名词时，谓语动词可以用单数，也可用复数。

None of the food is left.一点食物都没剩下。

None of the movies is (are) moving. 没有一部电影是感人至深的。

I tried many different ways of doing it, but none of them were successful.

我尝试了许多不同的方法做这件事，但都没成功。