[析]one作代词时，它的复数形式是ones,所有格形式是one's，反身代词为oneself.如果讲One should do one's best.则是对句。如果one与别的词组成其他词，如： someone, anyone, everyone或only one 则要用his/her，来作其所有格形式。
[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。
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