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1、Unit 5 It must belong to Carla,Period 1,Jim,Guessing,Who has the following things?,表示推测的情态动词 在英语中，表示对某件事物的确定程度，即表示推测的时候，我们通常会用到以下情态动词：must, might, could, may, cant, couldnt.,must,cant,could might,100% probably true,20%-80% possibly true,0 almost not true,Learn to make inference,must用在肯定句中表示较有把握的推测，意
2、为“一定”。(100%)He must be working at home.must 表示对已发生的事情的推测时，must 要接完成式 .The road is wet. It must have rained last night,He cant be _.He could/might be _.,He cant be _.He could/might be _.,He cant be _.He could/might be _.,He cant be _.He could/might be _.,He must be _.,Can you guess what it is?It coul
3、d be _.It also might be _.,a white vase,two faces,It could be _.It also might be _.,Can you guess what it is?,a dog,two girls,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.,1. 这本书一定是李雷的。他正在找这本书。This book _be Li Leis. He is looking for it.,2. 这
4、个发带可能是韩梅的。她喜欢戴发带。The hair band _be Han Meis. She likes wearing a hair band.,must,could,3. 这个玩具熊可能是约翰的妹妹的。她还是个小姑娘。The toy bear _belong to Johns sister. She is a little girl.,4. 这个排球不是玛丽的。她根本不喜欢排球。The volleyball _be Marys. She doesnt like playing volleyball at all.,might,cant,T-shirt,jacket,Toy car,ma
5、gazine,CD,book,cup,Listening and speaking (1b: P34),is her favorite author.,1. Janes little brother,toy car,He was the only little kid at the picnic.,2. Mary,book,Hemingway,listens to classical music.,3. Carla,volleyball,She loves volleyball.,4. Deng Wen,magazine,He loves cats.,5. Grace,CD,She alway
6、s,Thank you!,Bye-bye,一. can和could的区别和用法1. can表示体力和脑力方面的能力, 或根据客观条件能做某种动作的“能力”。 例如：Can you speak English？ Can you make a cake？ can用在否定句和疑问句中时有时表示说话人的 “猜测”或 “不肯定”。,例如：Can the news be true？(在日常会话中, can可代替may表示“允许”, may比较正式)2. could 是 can的过去式, 表示过去有过的能力和可能性, 还有怀疑和不肯定的意思(在否定和疑问句中)。,e. g.She couldnt skate
7、 when she was five years old. （能力）At that time we thought the story could be true （可能性） could用来提问, 是有礼貌的请求 Could.，please? 语气较为婉转。,e. g.Could I speak to Mr. Smith, please? 二. Might和may的区别和用法:1. may的用法: a. 表示“允许”或“请求”。e. g. May I come in？,在使用这一用法时需注意: may表示“允许”的否定形式是must not, 意思是“不应该” “不许可”。e. g.May I
8、 take this book out of the reading-room？No, you mustntb. 表示说话人的猜测，认为某一事情“或许”或“可能”发生。,e. g.He may know the answerc. may用在感叹句中可表示祝愿、愿望。 e. g.May you succeed(祝你成功。)May you have a pleasant journey(一路平安。),2. might的用法: a. might可以代替may, 表示现在时间的动作，但语气较为婉转客气或更加不肯定。e. g.Might I take a suggestion？ b. might用来表示
9、现在时间时, 还可表示“规劝”。,e. g.You might pay more attention to spoken English 三. must与have to的区别have to比较强调客观需要, must着重说明主观看法。另外have to能用于更多时态, 比较下面的句子：,We had to be there at 10:00. 有时两者都可以用, 意思差别不大。e. g. We must/have to leave now. must在表示说话人对事物的推测时候要注意它比may肯定得多, 相当于汉语的“一定”或“准是”。(只有在肯定句中能这样用。),This must be y
10、our room 在回答由must引起的问题时, 如果是否定的答复，不能用mustnt, 而需要用neednt或dont have to, 因为mustnt是“一定不要”的意思。,1. Choose the best answer,1. I didnt hear the phone. I _ asleep.A. must be B. must have beenC. should be D. should have been2. Mary _ be in Paris. I saw her in town only a few minutes ago.A. mustnt B. shouldnt
11、C. cant D. may not,B. must have been,C. cant,3. Peter _ come with us tonight, but he isnt very sure yet.A. must B. may C. can D. will4. I thought you _ like something to read, so I have brought you some books.A. may B. might C. could D. must,B. may,B. might,1. 这本书一定是李雷的。他正在找这本书。This book must be Li
12、Leis. He is looking for it.,2.Translation,2. 这个发带可能是韩梅的。她喜欢戴发带。The hair band could be Han Meis. She likes wearing a hair band.,3. 这个玩具熊可能是约翰的妹妹的。她还是个小姑娘。The toy bear might belong to Johns sister. She is a little girl.,4. 这个排球不是玛丽的。她根本不喜欢排球。The volleyball cant be Marys. She doesnt like playing volleyball at all.,
