情态动词专项复习.ppt
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情态动词专项复习 What is the modal verb? 情态动词本身有一定的词义,表示说话人对某一动作的看法和态度,但不能单独作谓语,必须和另一个动词原形一起构成谓语.即所有的情态动词后面都接动词原形. Eg: I can swim . (否定句) I can’t swim. He has to go now . (否定句) He doesn’t have to go now. 常见的情态动词有: can , could , may ,might ,must , have to , should, ought to , had better, need等. 1.can和could都可以表示能力。Could是can的 过去式。 2.can和could表示请求允许。could不是can的过去式,是一种委婉的说法.。 3.表示猜测,可能性。can 通常用于否定句和疑问 句, can’t 意为“不可能”。 It can’t be true. 那不可能是真的。 Can /could的用法 1.---Amy, I hear you’ve got many foreign coins. __________ I have a look? --- Of course. Should B. Must C. May D. Need 2. Bill_________ be ill at home. I’m not sure. A. could B. can C. must D. may may的用法: 1.表示请求和允许 。 2.表示推测、可能性。may 则通常用于肯定句和否定句。 may not 意为“可能不”。 It may not be true. 那可能不是真的。 C D 用must, have to ,mustn’t 填空: 1.We __________ protect our environment. 2.You ________ play on the road. It’s dangerous. 3.My mother is ill, so I ___________ go now. 4.After such a long way, you ___________ be tired. 5.There was no bus. I _____________ walk home last night. must 侧重于表示说话人的主观看法,意思是“应该,必须”, 其否定式mustn’t意为“不应该,不准”。 must表示推测,意思为:一定,必定(只用于肯定句中) 。 have to侧重于强调客观条件需要做的事情。 have to 有人称、时态和数的变化。 must mustn’t have to must had to 用恰当的情态动词填空: You ___________ (must, should) bring a jacket to the cinema because you might feel cold. You ________ (must , ought to) go to the toilet before the film begins. You __________ (had better, have to) buy some popcorn or soft drinks before the film begins. You ____________(had better not, mustn’t) drink cold water from the fridge. You _________ (needn’t, can’t) worry so much. I’m sure he’ll be well soon. should ought to had better had better not needn’t should作为情态动词最基本的意思是“应该”——既可指有责任或义务 “应该”做某事,也可指建议或劝告某人“应该”做某事. ought to“应当;应该”,有一种责任和义务,强调客观要求。后接动词原形. 否定形式 ought not to. You’d better do sth 你最好做某事 You’d better not do sth 你最好不要做某事 need 做情态动词用,通常用在疑问句、否定句中, 否定形式为need not do sth. 【例1】—Could I look at your pictures?
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