摘要: all和both, neither和either all表示不可数名词时.其谓语动词用单数.both和all加否定词表示部分否定.全部否定用neither和none. All of the books are not written in English. / Not all of the books are written in English. Both of us are not teachers. / Not both of us are teachers. / Either of us is a teacher.

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