all 所有,三者或三者以上都
both 两者都
either （两者中）任一的
neither 两者都不
none （三个或三个以上）都不
All of my friends come to visit me.(朋友大于或等于3个)
both sides of the road 道路的两边
Take either of the books.随便拿那本书都行.
He's lived in Landon and Tokyo,but he like neither of them.两个都不喜欢.
None of the children got an apple.一个孩子都没有得到苹果.