11.because， because of.because是从属连词后跟从句，because of是介词，后跟名词或名词短语。
f：the game was canceled because of it was raining.
t：the game was canceled because of the rain.
f：we could not see because the poor lighting.
t：we could not see because the lighting was poor.
f：he can move the furniture easily because of he is strong.
t：he can move the furniture easily because of his strength.
12.beside， besides.beside 意为next to，besides意为in addition to.
f：beside tommy， helen and i attended the concert.
t：besides tommy， helen and i attended the concert.
f：he was sitting besides the pretty girl.
t：he was sitting beside the pretty girl.
f：we visited california beside oregon.
t：we visited california besides oregon.
——we visited california. besides， we visited oregon.
13.between， among. between 用于两个人或两件事物，among用于三个以上的人或物。
f：the law was debated between the senators， the representatives， and the judges.
t：the law was debated among the senators， the representatives， and the judges.
f：there is a dispute between the local union members.
t：there is a dispute among the local union members.
f：you must choose among the two plans.
t：you must choose between the two plans.
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.