none of 的.用法
none用于指人或指物，可与of短语连用，用作单数或复数，总是用在一定范围之内。
none of短语中的none不能用no, no one, nothing , nobody来代替，只能用none。
none of
(三个或以上)都不
1、None of us knew how to treat her.
我们没有人知道该如何对待她。
2、It has nothing to do with me.; It's none of my business.
这事与我无干。
3、There have been a number of explanations, but none of them stack up.
已经提出了好几种解释，但没有一种能站得住脚。
4、None of us can run as fast as he can.
我们之中没有谁能跑得过他。