1、Unit 8 It must belong to Carla.,Section A Grammar Focus 4c,It could be _.It also might be _.,Can you guess what it is?,three birds,a beautiful face,课前预习,Can you guess what it is?It could be _.It also might be _.,a white vase,two faces,课前预习,It could be _.It also might be _.,Can you guess what it is?,
2、a dog,two girls,课前预习,Could A be bigger than B?In fact, A and B must be _.,Which one is bigger, A or B?,A,B,the same size,No.,课前预习,Grammar Focus,grammar,Use “must” to show that you think something is probably true. Use “might” or “could” to show that you think something is possibly true. Use “cant ”
3、to show that you are almost sure something is not true.,Grammar Focus,表示推测的情态动词有must, may, could, might, can。(1) must表示说话人对事物的推测可能性的程度非常大，意为“一定；准是”；表示有把握的否定推测时用cant，意为“不可能”。如： 1. I cant find my keys. I must have left them at home. 2. - Is she Mary?- That cant be her. Shes in hospital.,Grammar Focus,
4、(2) can表示“可能”，常用于否定句、疑问句中。could为can的过去式，表示推测的语气较can弱。如： - Can the man there be our math teacher? - He may be, but I am not sure.,Grammar Focus,(3) may意为“也许”。might为may的过去式，表示说话人对现在或将来不太确定的可能性的推测。如： Li Ming might get here in time, but I am not sure.,Grammar Focus,1. Whos singing in the next room? It _
5、 be her. She has gone to New York.A. cant B. must C. shouldnt D. can 【解析】考查情态动词表推测。表示否定推测时，用cant，意为“一定不”。must表示推测时，意为“一定”，用于肯定句；根据答语“她已经去了纽约”可知是否定推测，故选A。,例题解析,A,2. Whose T-shirt is this? It _ be John s. Its _ small for him.A. cant; much too B. cant; too much C. mustnt; much too D. mustnt; too much 【
6、解析】情态动词的用法。根据句意“它不可能是约翰的，对他来说太小了。”故排除C、D，too much为“太多”的意思，much too为“太”。故选A。,例题解析,3. Where are you going this month? We_ go to Xiamen, but were not sure.A. neednt B. must C. might D. mustnt 【解析】 neednt (不必)表建议； must (一定)表猜测的可能性很大； might (可能，也许)表不是很肯定的猜测。 mustnt(不允许)表命令。句意：-这个月你们将去哪？-我们或许去厦门，但还不确定。,C,
7、例题解析,4. - Have you decided where to go for your summer vacation? - Not yet. We _ go to Qingdao. Its a good place for vacation.A. may B. need C. must 【解析】句意：- 你已经决定到哪里过暑假了吗？- 还没有呢，我们也许去青岛，那是个度假的好地方。情态动词表示推测时，may表“可能”，must表“一定”，cant表“不可能”。,A,例题解析,1. A: Wheres Jean?B: Im not sure. She _ (is / might be
8、/ 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.,4a Choose the best way to complete each sentence using the words in the brackets.,might be,must be,Practice,3. A: Thats the phone.B: Hmm. I wonder who it _ (mus
9、t 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. 5. A: I hear water running in the bathroom.B: It _ (could be / must be / cant be) Carla. She was thinking of taking a shower.,could be,cant be,must be,Practic
10、e,4b Complete these responses,1. A: Many people are wearing coats.B: The weather must be_ . 2. A: Sally has been coughing a lot.B: She might be_ . A: This restaurant is always crowed.B: The food _ . A: Whenever I try to read this book, I feel sleepy.B: It cant _.,be interesting,cold,ill,must be deli
11、cious,Practice,4c Look 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.,A: It could be a girls room because its very tidy. B: I guess so. But it might be a boys roombecause the clothes look like boys clothes.,Practice,
