can与be able to的用法区别

can与be able to的用法区别

■时态形式(通常不用于进行时或与 be going to 连用), 而且还可以与某些情态动词连用(通常不与 can 连用), 甚至还可以有非谓语形式

He has not been able to go to school for a week. 他已有一周不能上学了。

You might be able to persuade him. 你也许能够说服他。

I hope to be able to do the work. 我希望能干得了这项工作。

I regret not being able to help her. 我很遗憾未能帮助她。

以上用法中的 be able to 均不能用 can 替换。