either (两者中任何一个),使用范围为两个人或物,either与单数连用.either…or… 表示两者之一.
e.g.:Either of the two boys is clever.两个男孩都很聪明.
Either I or he can swim.我或者他会游泳.
2.none(都不),使用范围为三者以上；none 可指人也可指物,作主语时,如和 of 连用指不可数名词时,谓语动词要用单数形式；指可数名词时,谓语动词用单、复数均可.
e.g.:I like none of the flowers. 这些花我都不喜欢.
None of them has / have seen me before.他们之前都没有见过我.
None of this money belongs to me.这些钱都不属于我.
3.both(两者都),使用范围为两个人或物,both与复数连用.
e.g.:Both the boys are clever.两个男孩都很聪明.
4.neither(两者都不),使用范围为两个人或物,neither与单数连用.neither…nor…表示两者之中都不.
e.g.: Neither of the two boys is clever. 两个男孩都不聪明.
Neither I nor he can swim .我和他都不会有游泳.