14.but， hardly， scarcely.這幾個詞帶有否定意味，不要再與另外否定性的詞連用。
    F：I couldn't hardly see him in the dark.
    T：I could hardly see him in the dark.
    F：She didn't earn but thirty dollars last week.
    T：She earned but thirty dollars last week.
    F：He doesn't spend scarcely any money on clothes.
    T：He spends scarcely any money on clothes.
    15.different from（不是 different than）。
    F：The result was much different than what I expected.
    T：The result was much different from what T expected.
    16.do， make.這兩個詞含義不同。
    F：They did a peaceful agreement.
    T：They made a peaceful agreement.
    F：I never do fun of other people.
    T：I never make fun of other people.
    F：It's time to do the sandwiches.
    T：It's time to make the sandwiches.
    F：Rarely does he do a mistake.
    T：Rarely does he make a mistake.