情态动词can怎么用

can表示能力,有“能”“会”的意思;表示可能性,多用在否定或疑问句中;表示请求和许可。

如:The parrot can speak three languages. 这只鹦鹉能讲三种语言。

Can I borrow the book from the library?我可以从图书棺借这本书吗?

Shanghai can be very cold in March. 上海三月份可能会很冷。

拓展延伸can还有过去式could 可表“能,会”,又可以和be able to替换,而be able to有 更多时态。 如:

He could swim when he was four. =He was able to swim when he was four. 他四岁时就会游泳。 在一般疑问句中,can/could 常用来表示请求或征求对方意见,用could 比用can语气更加委婉和客气。类似用法的还有Will /Would you (please)…等句型。

如:Could you tell me how I can get to the post office? 你能告诉我怎样到邮局吗? Would you please turn up the radio?请你把收音机开大点,好吗?

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