初二情态动词讲解祈使句专项练习.doc

情态动词常见的情态动词：can, could, may, might, must, should, need, had better等含义：表示说话人对所述动作的看法，如需要、可能、意愿或怀疑等。1用法特点： 它们必须与其他动词连用，即：肯定：情态动词动词原形：He can swim.否定：情态动词+not+动词原形：He can not(cant)swim.一般疑问句：把情态动词提前：Can he swim?Yes,he can./No,he cant.表示说话人对所述动作的看法，如需要、可能、意愿或怀疑等。情态动词没有人称和数的变化，即第三人称单数不加-s，有些情态动词有时态的变化 在意义上，情态动词具有“多义性”。例：can既可表示能力，又可表示可能、允许等意义。2.各情态动词的用法 （1）can： 表能力，“能，会”；表可能，猜测，通常用于否定句和疑问句中，This boat cant be hers, hers is black.（2）could：表can的过去式；表请求允许，比can更委婉地提出请求。 （3）May: 表猜测，“可能”（只能用于肯定句，否定句用cant） 表征求同意，May I come in? （4）Might: may的过去式；might比may更加委婉。 （5）Must: 表义务的“必须” 表事情的必要性和重要性。 You must take care of your parents. 表推测的“一定，准是”（只有肯定猜测，否定猜测用cant） The lady must be a doctor. （6）Should: 表义务或责任“应该”。（7）Need: 表必要性。 （8）Would: will的过去式； 表示意愿或用于第二人称的疑问句中，表礼貌委婉的请求，比can更委婉。（9）Had netter: 最好， （had better not） 3易混的情态动词 （1）Can/ could 与be able to: 表“能力”时 can只有现在和过去时两种时态，其余时态用be able to, can指与生俱来的能力，be able to后天形成的能力。（2）含有情态动词的疑问句的回答:1）.对may引出的问句，可以有下列回答方式：Yes,you may. Yes, of course.Yes, certainly.Sure . No, you cant.2）.对must引出的疑问句，回答方式为：Yes, must. No,dont(doesnt) have to./ neednt3）.could在疑问句中，表示委婉的语气，此时could没有过去式的意思。如:Could you help me?你能帮我个忙吗？Could I use your pen?我能用一下你的钢笔吗?Yes, you can.可以。（注意回答）4）.would you的回答方式有以下几种：Yes, I will. (No, I wont.)Sure . (Im sorry , I cant.)All right/ OK/ With pleasure.Certainly. (No, thank you .)Yes, please.（3）Must 的否定形式：mustnt “不许，禁止”（must表推测时无否定形式，否定猜测用cant）（4）Need：作实义动词时，后接名词、动名词、动词不定式 She doesnt need to take any medicine. 作情态动词时后接动词原形。She need take some medicine.一、用can, may, must, need, have to, had better的适当形式填空：1. You _ return the library book on time.2. I _ (not) find the way to the hospital. _ you show me the way?3. _ I finish the work right now? No, you _ (not). You _ do it later.4. He said he _ (not) come tonight.5. Her mother was ill. She _ stay at home and look after her.6. Its time for class. You _ stop playing football or you _be late for class.7. We _ start right now, or they would get there first.8. The cloud is lifting, so it _ (not) be a rainy day tomorrow.二、选择填空1.Do we have to finish our homework this afternoon? Yes, you _.A. must B. can C. may D. need2. Must I be in hospital for a week， Doctor? No， you . You can go back home tomorrow. A.mustnt B. neednt C. must 3. The desk is not dirty. You _clean it. A. mustntB. shouldntC. neednt D. cant4. May I watch TV for a while？No, you _. You have to finish your homework first. A. shouldnt B. neednt C. mustnt D. wont5.Is Jessica giving us a speech this evening?No, it _be her. She has gone to Japan.A. mustnt B. mustnt C. cant D. cant 6. Its the library! So you_ know shouting is not allowed here.A. canB. mustC. needD. may7. Boys and girls, dont forget your report . It _ today. A. cant finish B. cant be finished C. should finish D. should be finished8. Must I mop up the window now? No, you_.A.needntB. cantC. shouldntD. mustnt9. Is Lucy knocking at the door?No. It _ be Lucy. She is in Japan now.A. neednt B. must C. cant10. Another cup of coffee?No, thanks. I _ be off. Mary is waiting for me.A. can B. may C. must D. might11. Im a little tired. Lets go to the zoo by taxi.We take a taxi. Its not far from here. A. cant B. mustnt C. couldnt D. neednt12. If the traffic light is red, you _ cross the road. Its very dangerous.A. dont B. mustnt C. neednt D. wouldnt13. Must I finish watering the flowers now?No, you_.A. must B. wont C. neednt D. cant14. I cant give up smoking, doctor.For your health, Im afraid you _.A. may B. can C. have to D. must15. Our class won the English speaking contest.Congratulations! You _ be very proud of it.A. can B. need C. would D. must16. Excuse me, where are we going to have our class meeting?Im not sure. Ask our monitor, please. He know.A. can B. may C. need D. shall 17. _I borrow these magazines?Sorry, only the magazines over there can be borrowed.A. Must B. Would C. May D. Need 18 If the traffic light is red, you _ cross the road. Its dangerous.A. dont B. neednt C. mustnt D. wouldnt【中考链接】1Who is the man over there? Is it Mr. Li? No, it _ be him. Mr. Li is much taller.A. mustnt B. may no C. cant D. neednt2Must I go with them tomorrow？ No，you _. A. mustnt B. shouldnt C. neednt D. cant3_ I take some photos in the hall? No, you _.A. Can, neednt B. Must, mustnt C. Could, wont D. May, mustnt4Dad, must I finish my homework today?No, you _. You may do it tomorrow.A. neednt B. mustnt C. dont D. wont5The lake is said to be dry. Is that true?It _.Look, some kids are swimming in it.A. must be true B. cant be true C. may not be true6What is your mother going to do this Saturday? Im not sure. She _ go to see my grandmother. A. canB. mustC. may7Susan has bought a large house with a swimming pool.It _ be very expensive. I never even dream about it.A. must B. might C. cant D. shouldnt 8Listen! Is Professor Johnson giving a report in the hall?No, it be him. He has gone to Japan.A. needntB. may not C. mustnt D. cant9Lets go to the West Hill Park by taxi.Oh, it is not far away from here. We _take a taxi.A. couldnt B. mustnt C. neednt D. cant10Can you play the piano?Yes, I _. I often practice it on weekends.A. neednt B. need C. cant D. can 祈使句练习一、将以下祈使句改为否定式：1. Come here early. 2. Ask him. 3. Please wait for her. 4. Read the book carefully. 5. Sit under the tree, please. 6. Lets go there together. 二、选择最佳答案填空：1. If you are tired, _ a rest.A. have B. having C. to have D. had2. _ me go. It is very important for me.A. Do let B. let do C. Doing let D. To do let3. He is not honest. _ believe him. A. Not B. Dont C. To not D. Not to4. If you want to stay, let me know, _?A. will you B. shall we C. do you D. do we5. Never come late again, _? A. will you B. wont C. do you D. does he6. _ up early tomorrow, or you cant catch the train.A. Getting B. Get C. To get D. Got7. _ in the street. Its dangerous.A. Not play B. Not to play C. Dont play D. Dont to play8. Please _ me some money, will you?A. lend B. lending C. to lend D. be lend9. The film is about to begin. Please _ seated. A. be B. are C. is D. being10. Mary，_ the boxes. You may use them later. A. keep B. keeping C. to keep D. keptIII. 用括号内所给动词的适当形式填空。1. Its an important meeting. _ (not, be )late.2. _ (not,make) any noise! Your mother is sleeping.3. _ (not, speak) with your mouth full of food and _ (be) polite.4. _ ( not, talk) and _ (read) aloud.5. _ (not,leave) your homework for tomorrow, Larry.6. _ (look) out! A car is coming.7. _ (give) us ten years and just see what our country will be like.8. _ (not, let) the baby cry.9. Wear more clothes or you _ (catch) a cold.10. Lets _ (not, say) anything about it.VI. 选择填空 ( )1 .Her doctor said: “_ work so hard” A Stop B Dont C Cant D No ( )2. Sindy, _ to be here at 8 oclock A is sure B is sure that C will be sure D be sure ( )3._ when you cross the road. A Do care B Care C Do be careful D To be careful ( )4. _him the secret, will you? A Dont te