Do not confuse none and neither. You use none in negative statements to refer to three or more people or things. None could afford the food. You use none of in the same way, followed by a pronoun or a noun group. None of them had learned anything... None of his companions answered. You use neither in negative statements to refer to two people or things. Neither had close friends at university. You use neither of in the same way, followed by a pronoun or a noun group. Neither of them spoke... Neither of these extremes is desirable. Note that you can also use neither before a singular count noun. Neither side can win.

不要混淆 none 和 neither。none 是对三个或更多的人或物的否定：None could afford the food (没人买得起食物)。none of 的用法与 none 相同，后接表示一组人或物的代词或名词短语：None of them had learned anything (他们所有人都什么也没学到)，None of his companions answered (他的同伴中没人回答)。neither 是对两个人或物的否定。例如，Neither had close friends at university (两个人在大学时都没有亲密的朋友)。neither of 的用法与 neither 相同，后跟指两个人或物的代词或名词短语：Neither of them spoke (两个人都不说话)，Neither of these extremes is desirable (两个极端都不可取)。注意可以在单数可数名词前使用 neither。如，Neither side can win (双方都赢不了)。