1、Unit 8 It must belong to Carla.Section A Grammar Focus-4c學習目標Grammar：學習情態(tài)動詞must，could，might和cant 的用法語法重點：情態(tài)動詞表推測Sentences：I think it must be teenagers having fun.At first, I thought that it might be a dog, but I couldnt see a dog or anything else, either.There must be something visiting the homes in

2、 our neighborhood.新課講解Grammar FocusWhose volleyball is this? It must be Carlas. She loves volleyball.Whose hair band is this?It could be Meis hair band. Or it might belong to Linda. They both have long hair.What did you see that night?Im not sure, but it cant be a dog. It was bigger. I think it migh

3、t be a bear or a wolf.新課講解語法重點:情態(tài)動詞表推測表示可能、懷疑、允諾、愿望、義務(wù)、必要、猜測等的動詞就是情態(tài)動詞。英語中表示推測的情態(tài)動詞主要有 must, can, could, may, might等。定義新課講解1. 情態(tài)動詞不能表示正在發(fā)生或已經(jīng)發(fā)生的事情只表示期待或估計某事的發(fā)生。2. 情態(tài)動詞ought和have,后面只能接帶to的不定式。語法特征新課講解3. 情態(tài)動詞沒有人稱、數(shù)的變化，即情態(tài)動詞第三人稱單數(shù)不加-s。4. 情態(tài)動詞沒有非謂語形式，即沒有不定式、分詞等形式。 新課講解can可表示能力/允許/可能性/懷疑猜測，意為“可以，會，能”；can

4、t意為“不會，不能，不可以”，還有“不可能”之意。could為can的過去式，用法與can類似，常用于過去時態(tài)中；could還可用于現(xiàn)在時態(tài)中表示委婉客氣，相當于can；could也可表示驚訝懷疑，不相信。can新課講解may表示允許、也許，意為“也許；可能；可以”，語氣不太可能。對may的一般問句的回答：肯定回答一般是：Yes, please./ Certainly./ Sure等否定回答一般是：No, you cant/mustnt. may新課講解might是may的過去式，與may用法類似，語氣比may弱，表示推測的可能性更小，常用于肯定句和否定句中，不用于疑問句中。新課講解must表

5、示必須要做的事，意為“必須，應(yīng)該”。must一般問句的否定回答用neednt或dont have to，而不用mustnt，mustnt意為“不可以，不能”，表示禁止，不許可。must新課講解eg: Must we hand in our exercise book today? Yes, you must. ( No, you neednt.) must還可表示有把握的推測，意為“一定、肯定”。must的過去式還是must。在回答以must開頭的一般疑問句時，否定式需用neednt，表示“不必”的意思。新課講解【活學活用】 1. The lake is said to be dry. Is

6、that true? It _. Look, some kids are swimming in it!A. must be true B. cant be trueC. may not be true新課講解2. Where are you going this month? We _ go to Xiamen, but were not sure. A. neednt B. must C. might D. mustnt 新課講解3. Oh, its raining hard. Be careful! The road _ be wet.A. could B. must C. might新

7、課講解4aChoose the best way to complete each sentence using the words in brackets.1. A: Wheres Jean? B: Im not sure. She _ (is / might be/ must be) in the laboratory.2. A: Everyone is going to the pool after school. B: Really? It _ (must be / cant be / could be) hot outdoors.might bemust be新課講解3. A: Th

8、ats the phone. B: Hmm. I wonder who it _ (must be / could be / should be).4. A: I wonder if these are Jims glasses. B: They _ (cant be / might be / could be) his. He doesnt wear glasses.could becant be新課講解5. A: I hear water running in the bathroom. B: It _ (could be / must be / cant be) Carla. She w

9、as thinking of taking a shower. could be新課講解4b1. A: Many people are wearing coats. B: The weather must be_ .2. A: Sally has been coughing a lot. B: She might be_ .3. A: This restaurant is always crowed. B: The food _ .4. A: Whenever I try to read this book, I feel sleepy. B: It cant _.be interesting

10、 coldillmust be deliciousComplete these responses新課講解4cLook at this picture of a room. How much can you tell about the person who lives here? Is it a boy or a girl? What are his / her hobbies? Discuss your ideas with a partner.新課講解A: It could be a girls room because its very tidy.B: I guess so. But

11、it might be a boys room because the clothes look like boys clothes.新課講解It could be/might/cant be becauseDiscuss I guess so/I dont think so. But it might/could/must bebecause.當堂小練interviewerknockingwas interviewed一、填空1. Luckily, I _ (interview) by the _ (interview), a very old woman yesterday.2. Ther

12、e is someone _ (knock) at the door.當堂小練3. 同義句轉(zhuǎn)換： My parents called the policemen, but they couldnt find anything strange. My parents called the policemen, but they _ find _ strange.could nothing當堂小練二、單項選擇 1. Why are you so tired these days? Well, I have _ work to do. A. too much B. too many C. much too D. many too當堂小練 2. _ _ this balloon? Its Amys. A. Who; is B. Whose; are C. Whose; is D. Who; are3. Look! A book is on the floor. Whose is it? It _ be Ricks. It has his name on it. A. mustnt B. cant C. must D. need歸 納課堂小結(jié)語法重點：情態(tài)動詞表推測Grammar學習情態(tài)動詞must，could，might和cant 的用法Key s