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???［误］—Who won the game?—None.［正］—Who won the game?—No one.［析］由who提问的句子的否定回答中的简略说法是no one,而由How many提问的句子的否定回答中的简略语是None.如：How many books are there? None.????［误］There are many trees on either sides of the street.［正］There are many trees on either side of the street.［正］There are many trees on both sides of the street.［析］either作代词时由两个含意，其一是两者中随便哪一个，如：You can take either.其二是两者中的每一个。但要注意的是either后要加单数名词，如果作主语则谓语动词也要用单数形式。???［误］Either you or I are right.［正］Either you or I am right.［析］在either…or,或neither…nor连接两个主语时，其谓语动词要与和其相近的那个主语相配。???［误］I have three sisters. Neither of them is a doctor.［正］I have three sisters. None of them is a doctor.［析］neither用于两者中无一是，而none则用于多于两者中的人或事物无一是。