I can finish the article tomorrow. 我可以在明天写完这篇文章。
(2) be able to 的过去式可表示某人过去某种具体的能力(即在某一具体场合做某事的能力,往往暗示经过努力才具备的能力),但此时不能用 could)。如:
He worked very hard and was able to pass his examinations. 他学习很努力,所以考试及了格。
注:在否定句中 was (were) able to可用 couldnt代替。如:
He worked very hard but wasnt able to [couldnt] pass his examinations. 他学习很努力,但考试却未能及格。
(3) be able to 不仅有多种时态形式(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。如:
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。
3. cant 与 may not 的用法区别
(1) cant 有两个意思:它若表示能力,cant 意为不能;它若表示推测,cant 表示不可能。如:
I cant finish it in time. 我不能按时完成。
【高中英语语法:弄清三组情态动词的用法区别】相关文章:
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