[误] We could not help to laugh at once.?

　　 [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 2?10 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.?

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