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(1) be able to 强调通过努力而获得的能力，而can 则强调自身已具有的能力。如：She can sing the song in English.她能用英语唱这首歌。He will be able to sing this song in English in a few minutes, too.几分钟之后，他也能用英语唱这首歌。(2) be able to 强调一种结果，而 can 只强调一种可能。如：Luckily, he was able to escape from the big fire in the end.幸运的是，他终于逃出了大火。If he got here a few hours earlier, I could save him.要是他早几小时来，我还能救他。(3) be able to 可以有各种时态；而 can 只有一般现在和一般过去两种时态。如：I could help you last night, but you didn t come.昨天晚上我能帮你，而你又没来。Can you see it there?你能看见它在那儿吗？He is / was / will be able to help you.他能帮你的忙。(4) can 可用于表示可能性，推测，允许等情况，而be able to 通常不这样用。