情态动词本身有一定的词义，表示语气的单词，下面是情态动词can的用法，希望对大家有帮助。

1.表示体力或脑力方面的能力，或根据客观规律能做某事的能力。

(1)can表“能够”时，既可指现在也可指将来。

(2)can与be able to的区别：

① 表“能力”时二者同义

No one can / is able to do it.

② be able to常侧重经过努力有能力做到，有多种时态。can侧重自身的能力，只有一般现在时和一般过去时。

③ was / were able to do表示通过努力克服困难或在一定的条件下成功地做了某事，侧重结果，相当于managed to do或succeeded in doing...。could仅表自身的能力或本领，但未必成功做到。

With the help of the firemen, they were able to leave the burning house. He was able to swim across the river.

In the end, we were able to rescue the workers trapped in the fire.

2.表示“许可，允许”。在疑问句中表示请求，许可;否定句中表示“不许”。此时常与may通用：

May/Can I do it?

This sort of thing can't go on! 这类事情不能再继续了! 注意 can not有时可以表示“禁止”相当于mustn't：

You can't(mustn't，are not allowed to)play football in the street.你不可以在大街上踢球。

3.表示推测，强调客观可能性：“可能、会”。主要用于疑问句和否定句。表示推测、估计时，后边可根据不同情况用动词原形、进行式、完成式。

She can't be waiting for you. He can't have gone there alone.

4.表惊讶、疑虑。

How can it be that he was late for the opening ceremony?

高考英语语法情态动词can的用法总结就为大家分享到这里，更多精彩内容请关注高考英语考点栏目。

相关链接

2017高考英语代词考点之疑问代词  

2017高考英语代词考点之指示代词