14.but， hardly， scarcely.这几个词带有否定意味，不要再与另外否定性的词连用。
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.这两个词含义不同。
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.
