be able to强调经过克服困难之后终于能做某事，带有强烈的感情色彩，可用于各种时态。

　　After ten years of war， people were able to enjoy peace.

　　十年战争之后，人们终于能够享受和平。

　　After eight years of hard work， he was able to pay off all his debts.

　　八年艰苦劳动之后，他终于能够还清所有的债款。

　　I’ll be able to write articles in English next year.

　　明年我将能够用英语撰写论文。

　　Can也可表能够，但没有be able to那么强烈的感情色彩，它只有一般现在时和一般过去时。

　　I can drive a bus now， but I couldn’t ten years ago.

　　我现在会开车，但十年前不会。

　　Can you use a computer？你会使用电脑吗？

　　[巩固练习]

　　根据中文提示完成下列各句。

　　1. By next year， I will _____________（能够）write articles in English.

　　2. So far he has _____________（能够）sing foreign songs.

　　3. After a long time of effort， he _____________（能够）enjoy his success.

　　[试题答案]

　　1. be able to

　　2. been able to

　　3. was able to