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1、情态动词一、概念：情态动词是一种本身有一定的词义，表示说话人的情绪、态度或语气的动词，但不能单独作谓语，只能和其他动词原形构成复合谓语，没有人称和数的变化。情态动词数量不多，但用途广泛，主要有： can (could), may (might), must, need, ought to, dare (dared), shall (should), will (would) .二、can/could1. 表示能力（如体力和脑力方面），意为“能、会”Can you speak Chinese?Can you play basketball?2. 表示请求或者允许，多用在口语中，意为“可以、能”等
2、客观条件的允许。用于疑问句中用来提出要求，用于否定句中表示不允许。Can you help me?You cant play the computer3. 表示可能，理论上的可能。He can be out now.It cant bu sunny all the time.4. 表示说话人的猜测、怀疑、不肯定等，主要用于否定句、疑问句、感叹句中，带有感情色彩。How can yo be so rude!Can he be back?5. could可以作为can的过去式，也可以在提出请求时表示委婉。He could save the little boy.Could you help me?
3、三，Must1. 表示“必须、一定要”，多强调说话人的主观看法（表示客观需要时，常用_） 否定式mustnt表示“一定不要，禁止” You must see the doctor. Must you go soon? 对于must开头的一般疑问句，如果要做否定回答，可以用neednt, dont have to，不能用mustnt -Must I come over tonight? -No, you neednt2. 表示推测，意为“准是，一定是”，但是通常只用于肯定句，在否定句、疑问句中通常用cantIt must be true.Can it be true? It cant be tr
4、ue注意：Must 和have to 的区别1,must “必须”，表示主观愿望、看法，没有人称、时态和数的变化，对于must开头的一般疑问句，如果要做否定回答，可以用neednt, dont have to2,have to“必须，不得不” 表达的是客观需要，后接动原，有人称、时态和数的变化，疑问形式或否定形式要借助动词do来完成.选择1. Helen _ go on the trip with us, but she isnt quite sure yet.A shall B must C may D can2. Johnny, you _ play with the knife, you
5、 _ hurt yourself.A wont ,cant B mustnt, may C shouldnt , must D cant, shouldnt3. A computer _ think for itself; it must be told what to do.A cant B couldnt C may not D might not4. Could I borrow your dictionary? -Yes, of course you _.A must B might C can D could5. How _ you say that you really under
6、stand the whole story if you have covered only a part of the article?A can B must C need D may6. Oh, dear! What on earth _ this mean?A could B can C may D might7. Must I finish my homework today? -No, you _.A cant B neednt C mustnt D may not8. -_ I speak to Mary? -Speaking.A Must B Need C May D Shal
7、l9. This match problem is too hard. Nobody _ do it.A may not B may C cant D can10. Can you speak Japanese? -No, I _.A cant B mustnt C may not D neednt11.Can you answer my question, Lily? Yes, I _. A. may B. need C. must D. can12.Excuse me, _ you tell me the way to the nearest bus station? -Sorry, I
8、cant. Im a stranger hereA. can B. need C. must D. may13. After such a long journey, the children _ be very tired now. A. can B. must C. have to D. need14Would you like to go swimming with me this afternoon? -Id love to. But Im afraid I _. I have too much work to do.A. cant B. mustnt C. neednt D. may not
