never和ever的区别?

问题描述:

never和ever的区别?
具体在用法和意思上有何区别?
最好用例句说明

Never 决不,从不
I will never forget your kindness.
我永远忘不了你的好意.
One is never too old to learn.
活到老,学到老.
ever 曾经,永远,究竟
Have you ever been to Paris?
你去过巴黎吗?
Could we ever get permission?
我们会被允许吗?