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both of和either of有区别吗

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both of和either of有区别吗
有区别.
1 both of + 复数(名词/代词)+复数谓语动词------- Both of the men / them are doctors.
2 either of + 复数(名词/代词)+单三谓语动词-------Either of the men / them is a doctor.
3 both 强调两个中的全部,是复数概念.either强调两个中的每一个,是单数概念.