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语法考点各个掌握
can
1.表能力，在肯定句中指过去做某事的能力，泛指一般能力用could,只表具备做某事的能力，但并不表明是否干成。如：If I could plan to do anything I wanted to, I’d like to go to Tibet and travel through as much of it as possible.
2.表懊悔、遗憾，could have done表过去未曾实现的动作，即本能够干好的事却没干好。如：He paid for a seat, when he could have entered free.
I could have finished the job in the given time but the computer didn’t work.
3.表惊讶等感情色彩，仅用于疑问句、否定句和感叹句中。如：
How can you say that you really understand the whole story if you have covered only part of the article?
4.表推测，常不用于肯定句中，若用于肯定句中则表偶尔一时的特征，译作“有时会”;而can’t表不可能。如：
The World Wide Web is sometimes jokingly called the World Wide Wait because it can be very slow.
-----Isn’t that Ann’s husband over there?
-----No, it can’t be him. I’m sure he doesn’t wear glasses.
5.表许可，在请求对方许可时，can 在口语中常用;在准许对方做某事时，答语用can,不用could。如：A left-luggage office is a place where bags can be left for a short time, especially at a railway station.
------Could I borrow your dictionary?
-----Yes, of course you can.
【考例1】The biggest problem for most plants, which ______ just get up and run away when threatened, is that animals like to eat them.(07湖南卷，24)
A. shan’t B. can’t C. needn’t D. mustn’t (B)
【考例2】My MP4 player isn’t in my bag. Where _______ I have put it?(07福建卷，25)
A. can B. must C. should D. would (A)
【考例3】----Do you know where David is? I couldn’t find him anywhere.
-----Well. He _______ have gone far—his coat’s still here.(05湖北卷，19)
A. shouldn’t B. mustn’t C. can’t D. won’t (C)
【考例4】How ________ you say that you really understand the whole story if you have covered only part of the article?(03上海卷，29)
A. can B. must C. need D. may (A)
【考例5】You ______ be tired----you’ve only been working for an hour.(04四川卷，29)
A. must not B. won’t C. can’t D. may not (C)
【考例6】 It is usually warm in my hometown in March, but it _____ be rather cold sometime.(08福建卷，24)
A. must B. can C. should D. would (B)
【考例7】 You don’t have to know the name of the author to find a book. You ____find the book by the title. (08湖南卷，28)
A. must B. need C. can D. would (C)
【考例8】 –What sort of house do you want to have? Something big? --Well, it be big--that’s not important.(08陕西卷，9)
A. mustn’t B. needn’t C. can’t D. won’t (B)
【考例9】 She ______ have left school, for her bike is still here.(08天津卷，6)
A. can’t B. wouldn’t C. shouldn’t D. needn’t (A)
【考例10】 Peter ______ be really difficult at times even though he’s a nice person in general.(08辽宁卷，22)
A. shall B. should C. can D. must (C)
【考例11】 You ______ be hungry already — you had lunch only two hours ago!
A. wouldn’t B. can’t C. mustn’t D. needn’t (B)
相关链接： 2013江苏英语试题及答案解析 2013新疆英语试题及答案解析
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