1、情態動詞常見的情態動詞 Can, could, may, might, must, shall, should, need, will, would, dare, had better, have to, used to.含義：表示說話人對所述動作的看法，如需要、可能、意愿或懷疑等。用法特點： 它們必須與其他動詞連用，即：情態動詞動詞原形；否定： 表示說話人對所述動作的看法，如需要、可能、意愿或懷疑等。情態動詞通常沒有人稱和數的變化，即第三人稱單數不加-s，有些情態動詞有時態的變化 在意義上，情態動詞具有“多義性”。例：can既可表示能力，又可表示可能、允許等意義。各情態動詞的用法 （1）Ca

2、n： 表能力，“能，會”； 表可能，猜測，通常用于否定句和疑問句中，This boat cant be hers, hers is black.（2）could：表can的過去式；表請求允許，用于現在時和將來時，比can更委婉地提出請求。 （3）May: 表猜測，“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的過去式； might比may更加委婉。 （5）Must: 表義務的“必須” 表事情的必要性和重要性。 You must take care of your parents. 表推測的“一定，準是”（只有肯定猜測，否定猜測

3、用cant） The lady must be a doctor. （6）Shall: 用于第一人稱的疑問句中，表示征詢意見。 “應該”，多用于法律等條文中。（7）Should: 表義務或責任“應該”。 （8）Need: 表必要性。 （9）Will: 表“意愿，意志” （10）Would: will的過去式； 表示意愿或用于第二人稱的疑問句中，表禮貌委婉的請求，比can更委婉。 （11）Had netter: 最好， （had better not） （12）Have to: “不得不” （dont have to Do+s+have to ） （13）Used to: 過去常常 (usedn

4、t to / didnt used to / Did + s+ use to)C 易混的情態動詞 （1）Can/ could 與be able to: 表“能力”時 can只有現在和過去時兩種時態，其余時態用be able to, can指與生俱來的能力，be able to后天形成的能力。（2）含有情態動詞的疑問句的回答:1.對may引出的問句，可以有下列回答方式：Yes,you may. Yes, of course.Yes, certainly.Sure . No, you cant.2.對must引出的疑問句，回答方式為：Yes, must. No,dont have to./3.co

5、uld在疑問句中，表示委婉的語氣，此時could沒有過去式的意思。如:Could you do me a 你能幫我個忙嗎？Could I use your pen?我能用一下你的鋼筆嗎?Yes, you can.可以。（注意回答）4. shall引出的疑問句用于第一人稱，表示征求對方意見或客氣的請求。其回答方式有以下幾種：Yes, please.All right. No, thank you.5.would you的回答方式有以下幾種：Yes, I will. (No, I wont.)Sure . (Im sorry , I cant.)All right/ OK/ With pleasu

6、re.Certainly. (No, thank you .)Yes, please.（3）Must 的否定形式：mustnt “不許，禁止”（must表推測時無否定形式，否定猜測用cant）（64）Need：作實義動詞時，后接名詞、動名詞、動詞不定式 She doesnt need to take any medicine. 作情態動詞時后接動詞原形。一、用can, may, must, need, have to, had better的適當形式填空：1. You _ return the library book on time.2. I _ (not) find the way to

7、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 no

8、w, or they would get there first.8. The cloud is lifting, so it _ (not) be a rainy day tomorrow.二、選擇填空（ ）1.Do we have to finish our homework this afternoon?Yes, you _.A. must B. can C. may D. need（ ）2. Must I be in hospital for a week， Doctor? No， you . You can go back home tomorrow. A. mustnt B. ne

9、ednt C. must （ ）3. The desk is not dirty. You _clean it.A. mustntB. shouldntC. neednt C. cant（ ）4. May I watch TV for a while？No, you _. You have to finish your homework first. A. shouldnt B. neednt C. mustnt D. wont（ ）5.Is Jessica giving us a speech this evening? No, it _be her. She_ to Japan.A. mu

10、stnt; has gone B. mustnt ;has been C. cant ;has gone D. cant ;has been（ ）6. Its the library! So you_ know shouting is not allowed here.A. canB. mustC. needD. may（ ）7. Boys and girls, dont forget your report . It _ today. A. cant finish B. cant be finished C. should finish D. should be finished（ ）8.M

11、r Smith must have been to your home this morning. No, he _ ,because he didnt know my address.A. couldntB. cantC. mustntD. may not（ ）9. Must I mop up the window now? No, you_.A. needntB. cantC. shouldntD. mustnt（ ）10. Is Lucy knocking at the door?No. It _ be Lucy. She is in Japan now.A. neednt B. mus

12、t C. cant（ ）11. Another cup of coffee?No, thanks. I _ be off. Mary is waiting for me.A. can B. may C. must D. might（ ）12. 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. neednt（ ）13. If the traffic light is red, you _ cross the roa

13、d. Its very dangerous.A. dont B. mustnt C. neednt D. wouldnt（ ）14. Must I finish watering the flowers now?No, you_.A. must B. wont C. neednt D. cant（ ）15. I cant give up smoking, doctor.For your health, Im afraid you _.A. may B. can C. have to D. must（ ）16. It is usually warm in my hometown in March

14、, but it _ be rather cold sometimes. A. must B. can C. should D. would （ ）17. Our class won the English speaking contest.Congratulations! You _ be very proud of it.A. can B. need C. would D. must（ ）18. Excuse me, where are we going to have our class meeting?Im not sure. Ask our monitor, please. He k

15、now.A. can B. may C. need D. shall （ ）19. _I borrow these magazines?Sorry, only the magazines over there can be borrowed.A. Must B. Would C. May D. Need （ ）20. If the traffic light is red, you _ cross the road. Its dangerous.A. dont B. neednt C. mustnt D. wouldnt【中考鏈接】（ ）1Who is the man over there?

16、Is it Mr. Li? No, it _ be him. Mr. Li is much taller.A. mustnt B. may no C. cant D. neednt（ ）2Must I go with them tomorrow？ No，you _. A. mustnt B. shouldnt C. neednt D. cant（ ）3_ I take some photos in the hall? No, you _.A. Can, neednt B. Must, mustnt C. Could, wont D. May, mustnt（ ）4Dad, must I fin

17、ish my homework today?No, you _. You may do it tomorrow.A. neednt B. mustnt C. dont D. wont（ ）5The 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 true（ ）6What is your mother going to do this Saturday? Im not sure. She _ go to see my grandmother. A. canB. mustC. may（ ）7Susan 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 go