amount
1.amount是不及物动词，后面接to，如The expenses amount to（总计）¥50和That amounts to（等于）a refusal。假使后面该用动名词，很容易误用不定式，该特别注意，如That amounts to saying that he is a genius里的saying不可改作say。
2.amount用作名词，只可用在不可数的东西，不可用在可数的东西，如可以说a large amount of literature，不可说a large amount of books，该把amount改作number。
