[正] We could not help laughing at once.
[正]
We could not help but laugh at once.
[析] "couldn't help+动名词"表示禁不住做了某事。但could not help but与could not but后面要加不带to的不定式,意思都是不得不去做某事.如:You could not (help)
but respect him.
can be able to
can与be able to都可以用来表示能力,但can只有现在时与过去时,be able to则可用任何时态,如:He will be able to teach the child. 但要表示经过努力而达到的一次性动作则只能用be able to,如:He finally was able to jump over 210 meters. 或:The plane was able to fly over the mountain. 但要注意的是这两个词都没有进行时态,而be able to后面不接不定式的被动态。
can could
can与could都可以用在现在时的口语中,只是用could更为礼貌,语气更委婉。如:Could you tell us a story?
care
[误]
I don't care coffee.
[正]
I don't care for coffee.
[误] Take care for your steps.
[正]
Take care of your steps.
[析] care for是"对某物感兴趣",而care of是"关心,要当心某事",如:She didn't care for him. Take care of what you are doing.
[误] I don't care where we will go if it doesn't rain.
[正] I don't care where we go if it doesn't rain.
[析] 在it doesn't matter, I don't care, I don't mind, 及in case引出的状语从句后面要用现在时表示将来。如:I've got a football in case we have time for a game.
change
[误] I want to change my camera with that one.