either 和 both 用法有什么区别?

问题描述:

either 和 both 用法有什么区别?

either 两者其一 (表示肯定)
When will you come ,friday or saturday
Either is ok !(随便哪一天都可以)
both 两者都
Both of us are Chinese .(我们两个人都是中国人)