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[析]在作肯定回答时，I think so. I hope so. I believe so.但作否定回答时为：I don't think so. I hope/believe not.
[误]— He studied very hard this term.— So she did.
[正]— He studied very hard this term.— So did she.
[误]— English is difficult to learn.— So is it.
[正]— English is difficult to learn.— So it is.
[析] 在对话中如果某一动作同时适用于两个主语，这时在答语中要用缩写且要用倒装句。如第一组句，即studied hard既适用于he,也适用于she.但答语仅仅是对前句的重复，即仅仅是第一句的缩写时则不要用倒装句。如第二组句子为：英语难学。答语为：是的，难 学。这时缩写的答语不要用倒装句。
[误]Everyone should do one's best.
[正]Everyone should do his best.
[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。
[误]Either you or I are right.
[正]Either you or I am right.
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