Unit 5It must belong to Carla.Work hard!You are sure to SUCCEED!Never let YOUSELF down!GO!Who is the man?He cant be Bill Gate.?他他不可能不可能是比是比尔尔盖茨。盖茨。He may be Liu Xiang.他也许是刘翔。He must be Liu Dehua.他他一定一定是刘德是刘德华。Oh, yes. He is Liu Dehua.cant在此表示猜测，译为“不可能”，后接动词原形。Leading inLook and guessmay在此表示猜测，译为“也许，可能”，后接动词原形。must在此表示猜测，译为“肯定，极可能”，后接动词原形。Who is he?He cant be may (could) be must be ?Look and guess. Using “cant, may, must”Look at the picture. Write the things you see in the correct columns in the chart.ClothingFun thingsKitchen thingshatvolleyballplateT-shirtCDscupnotebooktoy carbook1aListen and match each person with a thing and a reason.1bPersonThingReasonJanes little brothervolleyballHemingway is her favorite author.Marytoy carShe loves volleyball.CarlamagazineHe was the only little kid at the picnic.Deng WenbookShe always listens to classical music.GraceCDHe loves cats.Listen and match each person with a thing and a reason.1bModel:A: Whose book is this?B: It must be Marys. Hemingway is her favorite author.作家PAIRWORK1cAsk and answer like the model.Practise making conversationsPractise making conversationsSample dialogue 1:Sample dialogue 1:A A: : Look! Whose toy car Look! Whose toy car is this? is this?B B: It must be Janes little : It must be Janes little brothers. Because he brothers. Because he was the only little kid was the only little kid at the picnic. at the picnic.Sample dialogue 2:Sample dialogue 2:A A: Look! Whose : Look! Whose book is this? book is this?B B: It must be Marys. : It must be Marys. Because Hemingway Because Hemingway is her favorite is her favorite author. author.Sample dialogue 3:Sample dialogue 3:A A: Whose CD is : Whose CD is this?this?B B: It must be : It must be Graces. Because Graces. Because she always listens she always listens to classical music. to classical music.1. The homework cant be Carols. She wasnt at school today.考例考例Look at the boy running on the ground. Is it Davis?It _ be him. I saw him go to the teachers office just now.A. mustB. cantB.C. couldD. might (2007湖北湖北黄冈黄冈)B答案和解析答案和解析 B。cant表示否定的推表示否定的推测；测；must表示肯定的推测；表示肯定的推测；could ,might表示可能的推测。表示可能的推测。2. The French book must be Li Yings. Shes the only one whos studying French.考例考例 Even the top students in our class didnt work out the problem. So it _ be very difficult.A. needB. mustC. cantD. shouldnt (07山东滨州山东滨州)解析解析 此处此处must表示肯定的推测。表示肯定的推测。B1. The textbook _ be his. It has his name on it.2. The beautiful trousers _ be Jims. They are too long.3. The football _ be Wei Huas or Tian Huis. They both play football.4. Where is Xiao Ling? She _ be in her bedroom, but I am not sure.5. After a long walk, the old man _be tired now.I. 用must, may, might或cant 填空。mustcantmightmaymustThank you Thank you for listening! for listening!