[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] couldnt 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 dont care coffee.
[正] I dont 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 didnt care for him. Take care of what you are doing.
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