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专题1:情态动词
情态动词是表示说话人的语气、情感和态度,本身有词义但不能单独作谓语的词。常用的情态动词有can, may, must, could, shall, will,need等。在句子中,情态动词后面必须跟动词原形,并与后面的动词一起构成谓语。情态动词一般没有人称和数的变化。
1. can的用法:
(1)表示能力 eg: She can swim fast, but I can’t.
(2)表示许可 eg:You can use my dictionary.
(3)表示推测,意为“可能”,常用于否定句和疑问句中,can’t译为 “不可能”。
eg:—Can it be our teacher? —No, it can’t be our teacher. He is on a visit to the Great Wall.
【练习】—I think Miss Gao must be in the library. She said she would go there.
—No. She __be there, I have just been there.
A. can’t B. mustn’t C. needn’t D. wouldn’t
(4)can引出的疑问句,回答方式为:
肯定回答:Yes, sb can. 否定回答:No, sb can't.
2. could的用法:
(1)can的过去式,表示过去的能力,意为“能、会” 如:He could write poems when he was 10.
(2)could在疑问句中,表示委婉的语气,此时could没有过去式的意思。
Could you do me a favor? 你能帮我个忙吗?
XXXXX:—Could I use your pen? —Yes, you can.可以。(注意回答)
(3)could引出的疑问句,肯定回答只能用can,不能用could。 否定回答:No, sb couldn't/can't.
3. may的用法:
(1)表示请求、许可,比can正式, 如:May I borrow your bike? You may go home now.
【练习】—_______ I borrow your MP3? —Sure . Here you are.
A. May B. Should C. Must D. Would
(2)表示推测,谈论可能性,意为“可能,或许”,一般用于肯定句中
eg:It may rain tomorrow . She may be at home.
(3) may的过去式为might,表示推测时。可能性低于may。
eg:He is away from school. He might be sick.
(4) 表示希望、祈求、祝愿,常可译为“祝愿”。通常是用may +主+V
May you have a good time. May you succeed!
(5)对may引出的问句,可以有下列回答方式:
肯定回答:Yes, you may. /Yes, of course. /Yes, certainly./Sure .
否定回答:No, you mustn’t. /No, you can’t.
4. must的用法:
(1) must表示主观看法,意为“ 内容过长,仅展示头部和尾部部分文字预览,全文请查看图片预览。 our summer vacation.
—I'm afraid not. I ________ go to Dali to visit my uncle and his family.
A. can B. could C. would D. have to
16.—Can your brother________? —Yes, he ______.
A. play the chess; can B. play chess; can C. play chess; does D. play the chess; is
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