情态动词
情态动词有一定的词义,但词义不完全,须同动词原形连用;
情态动词没有人称和数的变化;
疑问句直接把情态动词提前,否定句在情态动词后面加not。
*情态动词中有一类是具有情态动词特征的词,如have to,但它有人称、数的变化,它的疑问句和否定句的构成方式也和其他情态动词有所不同。
can 的用法
一、表能力,有能,会,能够的意思。例如:
-Can you drive a car? 你会开车吗?
-Yes, I can. 我会。/ No, I cant. 我不会。
二、表允许,在口语中代替may,有可以的意思。
(见下面 may 的用法第四点)
三、表示可能性,常用于否定句和疑问句。例如:
Can it be true? 那会是真的吗?
Today is Sunday. He cant be at school. 今天是星期天,他不可能在学校里。
很多同学都不太清楚 can 与 be able to 的异同吧,赶快来学习一下吧
may 的用法
一、表示许可或征求对方的许可,有可以的意思。例如:
You may go now. 你可以走了。
May I use your computer? 我用一下你的电脑可以吗?
二、回答以 may 开头的疑问句有如下表达法:
-May I smoke here? 我可以在这儿抽烟吗?
-Yes, you may. / Yes, please. 请抽吧。
-No, you cant. / No, you mustnt. / No, youd better not. 请不要抽烟。
三、表示猜测,通常只用于陈述句。例如:
You may be right. 你可能是对的。
四、在口语中 can 可以代替 may 表示许可,但 can 较随便,may 更正式。例:
Can I use your bike, John? 约翰,我可以用一下你的自行车吗?
May I have a look at your license please, sir? 先生,我可以看一下你的执照吗?
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