beableto与can用法区别.doc

(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。