情態(tài)動詞can 的用法小結(jié)

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1、情態(tài)動詞can 的用法小結(jié) 情態(tài)動詞是高考的考點，對中學生來說也是個難點，而can的用法較其他情態(tài)動詞多，現(xiàn)根據(jù)中學課本和近幾年的高考試題，將其重點內(nèi)容列出。 一．表示能力 1．Can you type? 2．I can do it. can 與be able to 的區(qū)別 1. be able to 能用于各種時態(tài)?！霸O(shè)法做成某事” 相當于 managed to do sth.. / succeeded in doing sth.。 2. can / could 只能表示現(xiàn)在或過去的能力。 例： 1） A computer __

2、____ think for itself; it must be told what to do. A. can’t B. couldn’t C. may not D. might not 析：答案是A，表示能力. 2）. The fire spread through the hotel very quickly , but everyone ______ get out. A. had to

3、 B. would C. could D. was able to 析：答案是D。表示經(jīng)過努力才成功地逃出大火。 二．can/could 表示許可/允諾 1．Can/could Tom use the car? Yes , he can. 與may /might 的區(qū)別 1．might, could 比較委婉, 一般多用于疑問句. 2．在以could, might 表示征詢對方意見或表示請求時，回答應(yīng)相應(yīng)使用can, may. 例： 1）. — Could I borrow your dictionary?

4、 — Yes, of course you _______. A. might B. will C. can D. should 析：答案是C。第一句的請求用could，所以回答時相應(yīng)用can 2.） — Might I watch TV after supper? — Yes, you ________. A. may B. must C. might D. can 析：答案是A。第一句的請求用might，所以回答時相應(yīng)用may. 3）.---Could I call

5、 you by your first name? ---Yes, you _____. A. will B. could C. may D. might 析：答案是C。第一句的請求用could，回答時相應(yīng)用can, 但選項中沒有can，所以最佳的是may. 三．can指可能性 He can’t be at home. He has gone to Beijing. 與must may , might, could /Should, ought to的區(qū)別 1.should, ought to:按理應(yīng)當, 很可能 2.must：表示肯定的猜

6、測 3.may /might：表示可能的猜測 4.can/could：表示否定或疑問的猜測 例： 1） -when can I come for the photo ? I need them tomorrow. -- They ____ be ready by 12:00 A. can B .should C. might D. need 析：答案是B。根據(jù)情景，應(yīng)表示可能的猜測，選might可能會走掉顧客 2）Peter ___ come with us tonight, but he isn’t very sure yet. A. must

7、 B. may C. can D. will 析：答案是B。根據(jù)he isn’t very sure，表示可能的猜測 3）.Michael ___ be a policeman, for he is much too short. A. needn’t B. can’t C. should D. may 析：答案是B. 根據(jù)for he is much too short，可以判斷是表示否定的猜測 4）----_____he be watching TV now? — Yes, he _____ be watchi

8、ng TV now. — No, he _____ be watching TV now. A. Must; can; mustn’t B. Can; must; can’t C. Can; can; mustn’t D. May; must; needn’t 析：答案是B。第一句和第三句分別表示疑問和否定的猜測，第二句表示肯定的猜測。 四. can /could have done 1 過去有能力做到而實際上沒有做到的事情.含有責備或勸告之意。 2 用于否定句,對過去發(fā)生事情的否定猜測. 例： 1）. ---There were already

9、 five people in the car, but they managed to take me as well. ----It ____a comfortable journey A. can’t be B. shouldn’t be C. mustn’t have been D. couldn’t have been 析： 答案是D。根據(jù)上下文，已經(jīng)有5個人在車上，但還是把我?guī)?，所以，這次路途不可能是舒服的，屬于否定的猜測。而第一句的時態(tài)用過去時，所以是對過去發(fā)生事情的否定猜測. 2） You made a lot of mistakes in your composition yesterday. You ________ it much better. A. can write B. could have written C. must have written D. should write 析：答案是B。意為：昨天你在作文里犯了很多錯誤，你本應(yīng)有能力把它寫得更好，含有責備的語氣。 第 3 頁 共 3 頁