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1、Grammar： Modal verbs 情态动词,情态动词（modal verbs)：表示说话人的语气或情态，如请求、命令、愿望、能力以及可能性等。英语的情态动词有：,can/could may/might must shall/should will/would need have to,能够 可能 必须 应该 意愿 敢 需要 不得不,+ 动词原形,Shall一般只能用于第一人称。 I shall think it over and Let you know my idea. 我将考虑一下此事，然后告诉你我的想法。,情态动词不能单独作谓语动词，只能与动词原形一起做谓语，没有人称和数的变化。
2、 A bird can fly . Fish cant live without water. You must hand in your homework at once. You mustnt talk loudly in public.,能够(表能力),可以(表允许),必须,主语 + can + 动词原形,主语 + may + 动词原形,主语 + must + 动词原形,主语 + cannot/ cant + 动词原形,主语 + may not + 动词原形,主语 + must not/ mustnt + 动词原形,Can + 主语 + 动词原形？,May + 主语 + 动词原形？,Mu
3、st + 主语 + 动词原形？,Yes, 主语 + can. No,主语 + cant.,Yes, 主语 + may. No,主语 + may not.,Yes, 主语 + must. No,主语 + neednt.,在口语中可用can代替，但may更礼貌。,1.My elder brother _(能) drive a car. 否定句： 一般疑问句： 肯定回答： 否定回答： 就划线部分提问：,Practice,can,My elder brother cannot/cant drive a car.,Can your elder brother drive a car?,Yes, he c
4、an.,No, he cant.,What can your elder brother do?,2.You _ (可以) leave now. 否定句： 一般疑问句： 肯定回答： 否定回答： 就划线部分提问：,Practice,may,You may not leave now.,May I leave now?,Yes, you may.,No, you may not.,When may I leave?,3.Lily _ (必须) go to the library. 否定句： 一般疑问句： 肯定回答： 否定回答： 就划线部分提问：,Practice,must,Lily mustnt
5、go to the library.,Must Lily go to the library?,Yes, she must.,No, she neednt.,Where must Lily go?,A.用must(not), may(not), can(not)填空： 1.I dont understand this word. _ I use your dictionary? -Yes, please use it. 2.The traffic light is turning red. We _ stop. 3.You _ borrow two books at a time. 4.Tom
6、 _ play table tennis, but he _ play football. 5.Doctor, _ I take much medicine? -No, you neednt. But you _ drink a lot of water. 6.Tom is good at drawing. He _ draw wonderful pictures. 7.You _ smoke here. Its dangerous. 8.-May I turn on the TV? No, you _. My dad is sleeping.,Test Yourself,May/Can,mu
7、st,may/can,can,cant,must,must,can,mustnt/cannot/may not,may not,cant,Test Yourself,B.单项选择： 1.-_ I ask you a question? -Sure A. May B. Do C. Should D. Am 2.Can I go to the park, Mum? -Certainly. But you _ be back by six oclock. can B. may C. will D. must 3._ you dance? We need some more dancers for t
8、he talent show. May B. Can C. Must D. Should 4.Im afraid I need a pair of glasses. I _ hardly see the words on the blackboard. can B. must C. may D. should 5.You _ cross the road now. You have to wait until the light turns green. A. dont B. didnt C. wont D. mustnt,Test Yourself,6.Must I answer this
9、question in English? -No, you _. mustnt B. cant C. neednt D. shouldnt 7.Alice, please be quiet! The others _ hear clearly. cant B. mustnt C. shouldnt D. may not 8.I am afraid I _ go with you. I am very busy these days. may not B. cant C. mustnt D. shouldnt 9.I am going to bed. I _ get up early tomorrow morning. can B. must C. should D. May 10.May I smoke here? -No, you _ only do that in the smoking room. A. can B. cant C. must D. mustnt,
