all / each / both / none / either / neither不定代词或形容词的用法：

　　1All boys / All of the boys are from China. (all 若接可数复数， 谓语也用复数。)

　　All of the water is polluted. (若接不可数，谓语用单数。)

　　2Each boy / Each of the boys has a different bag.

　　each接名词单数或接of + 限定词+复数，其后谓语都用单数。

　　3Both of the twins are clever. 后面谓语用复数。

　　4None of the students has / have been there before.

　　none +of +限定词+复数， 谓语用单、复数都可。另见88.

　　5-When shall we meet， Saturday or Sunday？

　　-Either day is OK. / Either of the days is OK. 谓语用单数。

　　6-When shall we meet， Saturday or Sunday？

　　【 all / each / none分别指三者或更多中的“都” / “每一个”/“没有一个”。

　　both / either / neither分别指两者中“都”/“任何一个”/“没有一个” 】

　　-Sorry， I have to look after my mother these two days. That is， neither time is OK. / neither of the days is OK. 谓语用单数。

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