发布时间:2022-04-25T19:00:25 英语语法



He could swim when he was five. 他五岁时就会游泳了。

Can you drive a car? 你会开车吗?

—Yes, I can. 我会。

—No, I can’t. 我不会。


I think the work can be completed ahead of time. 我认为这项工作能提前完成。

What can he mean? 他会是什么意思?

注:表示推测时,could不是过去式,只是语气更委婉;若是推测已发生的事或过去的情况,用can/could have加过去分词。如:

Today is Sunday. He can’t/couldn’t be at school. 今天是星期天。他不可能在学校里。

Mike can’t have found his car, for he came to work by bus this morning. 迈克一定还没有找回他的车,因为早上他是坐公共汽车来上班的。


It can be quite windy there, especially in spring. 那里有时容易刮风, 特别在春季。

表示允许:可以 (口语中常代替may)

You can first lend me one book this time. 这次你可以先借给我一本书。

You can’t take the book out of the room. 你不可以将这本书拿出室外。


1. 表示允许别人做某事只能用can,不能用could。

2. can’t 和 mustn’t 一样,都可表示“不准,不允许”。


Can I go swimming today, please, mum? 妈妈,我今天可以去游泳吗?

Could you tell me how I can get to the railway station? 请告诉我去火车站怎么走吗?


—Could I have the television on? 我可以开电视看吗?

—Yes, you can. / No, you can’t. 可以。/ 不可以。

canbe able to的比较

(1) be able to比can有更多的时态。如:

In the past 50 years or so, scientists have been able to “see” farther and farther into the sky. 在过去50年里,科学家们已经能够往天空看得更远。

(2) 在表示过去具体某次能够成功做成某事时,只能用was/were able to。如:

He worked very hard and was able to pass that examination. 他学习非常努力他以能够通过了那场考试。