Unit 8 It must belong to Carla.,单元语法聚焦(八),情态动词表示推测 情态动词can，could，may，might，must都可以表示推测，表示说话人对事情发生的可能性的推测。其结构为“情态动词动词原形”。eg：He must stay there.他一定待在那里。 情态动词表示推测时，肯定句一般用must be(一定是，肯定是)，might/could be(可能是)；否定句用cant be(不可能是)；疑问句用can。 1must表示对现在的状态或现在正在发生的事情的推测时，must后面通常接系动词be的原形。eg： You have studied hard for five hours.You must be tired.你已经学习了五个小时了，一定累了。,2“may/might/could动词原形”多用于肯定句形式，其“推测，判断”的语气不能确定，用may意为“也许；可能”；用might不表示过去时态，只表示语气较may更弱，意为“或许；大概”。eg： I dont know where she is.She may be in New York.我不知道她在哪儿，可能在纽约。 The guitar might be Janes.She plays the guitar.这把吉他可能是简的。她弹吉他。 It could be Meis hair band.这可能是梅的发带。 3“can/could not动词原形”用于否定句或疑问句中，表示“否定推测或判断”，有“不可能”之意。用cant还是用couldnt没有时态差异，只是cant的语气较couldnt强。eg： There is no light in the room.She cant be at home now.房间里没有灯光。她现在不可能在家里。,1The textbook be Li Mings.It has his name on it. 2The beautiful trousers be Jims.They are too long. 3The large shoes be Marys.She has small feet. 4The football be Wei Huas or Tian Huis.They both play football. 5The guitar belong to Sam.He often plays the guitar.,must,cant,cant,might/may,must,二、单项选择。 ( )6.I still havent found my pet dog.(2016武汉) Im sorry to hear that.You _ be very sad. Amay Bmust Cshould Dcant ( )7.Whos singing in the garden? It _ be Mr.Brown.He always practices singing at this time. Amust Bcant Cneed ( )8.Where are you going this month？(2016呼和浩特) We _ go to Xiamen，but were not sure. Aneednt Bmight Cmust Dmustnt,B,A,B,( )9.Whose Tshirt is this? It _ be Johns.Its much too small for him. Amight Bcant Cneednt ( )10.Excuse me，when are we going to have a picnic? Im not sure.Ask our monitor，please.He _ know. Aneed Bcan Cmay Dmust,B,C,三、按要求完成句子，每空一词。 11The beautiful coat is Mikes_sisters(对画线部分提问) _the beautiful coat? 12The English book must be Sallys.(改为同义句) The English book must _Sally. 13This person must be a Chinese teacher.(改为否定句) This person _be a Chinese teacher.,Whose is,belong to,cant,14她不可能正在实验室等着你。(翻译句子) She _for you in the_. 15你昨晚熬夜了，现在一定困倦了吧。(翻译句子) You _now after your staying up late yesterday.,cant be waiting,laboratory,must be sleepy,四、用must，might，can，could或cant完成下列对话。 A：Tina，you look worried.Whats wrong? B：I cant find my English book.Where 16._ it be？I 17._ have lost it. A：Dont worry.Lets see where it 18._ be. B：I think I 19._ leave it in the reading room.But it isnt there. A：What does your book look like？Lets look for it together. B：Its blue. A：Oh，look！Is this one yours? B：No.It 20._ be mine.Toms name is on it. A：Im afraid you have to buy a new one.,might,must,could,might,cant,