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情态动词专题 易混点一 can 和 beableto两者表示能力时用法相同， 但 can 只有原形 “can” 和过去式“ could ”两种形式，在其他时态中 要用be able to 来表示。 另外 be able to 常常指经过努力， 花费了时间和劳力之后才能做到某事。Jim cant speak English. He could speak English at 5. Well be able to see him next week. He has been able to drive. I m sure you ll be able to finish it quickly. We were able to reach the top of the mountain at noon.易混点二 can和may 1. can 和 may 均可用来征求意见或许可，意为“可以”， 一般可互换2.can 和may 表示可能性时的区别：1) 在肯定句中用 might， may， must， 不用can2) 在疑问句中表示推测用 can，不用 might， may，must 3) 在否定句中用cant（不可能）， 不用 may， must。 That cant be true. 易混点三 may be 和maybe 用法区别常用位置may be may为情态动词， be为动词原形，句中作谓语maybe副词，大概、也许，相当于perhaps位于句首，作状语He may be wrong , but Im not sure. 易混点四 cant 和 mustnt.cant 根据其基本用法可译为：（1）不会，I cant speak English . （2）不能，We cant do it now because its too dark.（3）不可能，The man cant be our teacher because he is much younger than our teacher. mustnt 意为“ 禁止、不许”， 用来表达命令，表示强烈的语气。 You mustnt play football in the street. Its too dangerous.易混点五 must 和 have to must 侧重于个人意志和主观上的必要， 还可以在间接引语中表示过去的必要或业务， have to 侧重于客观上的必要，可用于现在时、过去时和将来时I know I must study hard.My brother was very ill, so I had to call the doctor in the mid-night. 易混点六 need， dare 的两种用法 need ， dare 作情态动词是， 多用于否定句、疑问句中，后接动词原形。 You neednt explain it to me .Dare you say that again在肯定句中， 它们后边多接动词不定式，此时为实义动词。Tom needs to fetch the bool for me . Mary dared to go across the street by herself.易混点 七 used to do / be used to doing / be used to doused to do 表示过去常常发生的动作而be used to doing 意为“现在习惯做”， be 可有各种时态； be used to do 意为“被使用去做,” 为被动语态形式。My father used to eating meat.She is used to eating meat.He wasnt used to eating in a restaurant.Knives are used to cut things. 练习检测 1. Nobody _ do it. Let me _ . A. can, try B. cant, to try C. can, to try D. cant, trying2. “ _ you like _ bananas to eat?” “ Yes, please.” A. Would, some B. Will, any C. Could, any D. Can, some3. “ Can you answer this question in English?” “ Sorry, I _.” A. neednt B. may not C. cant D. mustnt4. “ _ I borrow your dictionary?” “ Certainly, here you are.” A. Must B. May C. Need D. Shall5. I _ see the words on the blackboard. _ you write a bit clearly? A. mustnt, Can B. dont, will C. cant, Can D. neednt, Could6. Its a sunny day today. You _ take a raincoat with you. A. cant B. mustnt C. neednt D. can7. Ive looked for my pen everywhere, but I _ find it. A. couldnt B. cant C. mustnt D. didnt8. “ _ I speak to Ann?” “ Speaking.” A. Must B. May C. Need D. Shall9. Shall we go to the zoo tomorrow? _. A. Yes, we shall B. Yes, you shall C. Yes, you will D. All right10. Mr. John, we must hand in our homework today, _? No, you _. But you must bring it to school tomorrow. A. neednt we；mustnt B. mustnt we；neednt C. mustnt you；mustnt D. neednt we；neednt11. _ I take the newspaper away ? No, you mustnt. You _ read it only here. A. Must; can B. May; can C. Need; must D. Must; must12. - Must I stay at home and take care of her? - No, you _. A. mustnt B. wont C. cant D. neednt 13. - Can you mend a TV set? - No, I _. A. mustnt B. cant C. may not D. neednt14. - Whose guitar is this？ - _. A. It must Alis. B. It might belong to Alis. C. It must Ali D. It might belong to Ali.need, neednt, can, cant, shall, shouldnt may, must, mustnt, have to, would 15. I _ show him the way, _I?16. Can you answer this question in French? No, I_.17. May I keep the book for three weeks? No, you _ .18. Nobody _ live without air or water.19. You _ not worry. Everything will be all right.20. _ I have some chocolates now? No, you mustnt.21. Children _ be left alone.22. I _ finish my homework before I go to bed.23._we go out for a walk? Thats a good idea.24. _you like some fish?
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