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/couldmay/mightmustshall/shouldwill/wouldneedhave 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。A bird c
2、an 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？,Must + 主语 + 动
3、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 can.,No, he
4、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 go to the l
5、ibrary.,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 _ play tab
6、le 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,must,may/can,c
7、an,cant,must,must,can,mustnt/cannot/may not,may not,cant,Test Yourself,B.单项选择： 1.-_ I ask you a question? -SureA. 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 the talent sho
8、w. 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 question in E
9、nglish? -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,
