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1、Grammar,(可能是Mary。),(绝对不是Mary。),(可能不是Tom。),Mum: Who is it ?,J: It must be Tom.,M: It may be Mary.,J:It cant be Mary. She is in China.,M:It may not be Tom.,Jim: (一定是Tom。),(可能是Kate。),(绝对不是Marry。),(可能不是Tom。),Mum: Who is it? Jim: (一定是Tom。),It must be Tom.,It may be Kate.,It cant be Marry,It may not be To
2、m.,Use some modal verbs to say sth. that is possible.,MUST CAN MIGHT,FORMS 肯定形式 否定形式 疑问形式 备注,must / /,can cant/cannot Can？,could could not Could？,may may not,might might not,COULD,MAY,ORDER:,Might May Could Can Must,UNCERTAIN CERTAIN,can可表示客观的可能性,逻辑上的可能性,并不牵涉具体事情是否发生，要表示某事发生的实际可能性时，须用could, may, mig
3、ht。,Could I use your bike, Jack?,Of course, you can.,It cant be Tom, because he had gone to USA.,1.Accidents can happen on such rainy days.,2.Will you answer the doorbell? It may be your father.,3.We may go camping next Sunday.,4.Water can be turned into ice if it is cold enough.,Modal Verbs (3),mus
4、t,can / could,may / might,When you are very sure of something, you use _in positive sentence and _or_ in negative sentences.,When you think that something is possible, but you are not very sure, you use_, _or_.,must,cannot,cant,could,might,may,2.It must have rained last night, _?,It must be nice to
5、take a walk here, _?,表示推测时，其反意疑问句应根据 动词的实际时态而变化。如：,isnt it,didnt it,3.He must have been met you somewhere before,_ ?,4.You must have seen her yesterday, _?,didnt you,hasnt he,6.Come on,lets hurry.They may be waiting for us at the school gate.,5.You cant be serious,_?,are you,I am not sure whether he
6、 will come or not. He must come tonight. He mustnt be an American because he cant speak English at all. I tried to call him at the office, but there is no reply. He can be at home.,may,cant,may,can / could 的用法,can / could表示的可能性比must小，can表现在和将来，could既可表过去，也可表现在或将来，但它的可能性比can小。 can / could可与not连用，表示否定
7、推测，也可用于疑问句中. Can / could表推测时，其反间疑句也是根据动词的实际时态国以变化。如：你不可能当真的，对不对？,You cant be serious, are you?,4. can / could have done，意为“本来能够”，用于否定句时，意为“过去（不）可能”，而实际上都未发生。 如： 你本来可以来早点的。,You could have come earlier.,may/might的用法,may / might的可能性最小，往往表示原因说话人对某事没把握 May / might可与not连用，表示否定推测，但may用于疑问句时中能表示请求允许。,The te
8、acher may not be serious.,May I leave now?,3. May / might have done, 表示对过去可能发生某事的推测。 如： 你在做这件事时也许注意到了什么。,You may have noticed something while you were doing this.,May have done Might have done Could have done Can have done Should have done Ought to have done Shouldnt have done Cant have done Couldnt
9、 have done,可能已经做过某事 也许已经做过某事 本来可以做某事 本来可以做某事 本来应该做某事 本来应该做某事 本来不应该做某事 不可能已经做过某事 不可能已经做过某事,对过去事情的推测：,1.I may have been pretty in those days. 2. He cant have been to Beijing. 3.She might have been hurt at the party yesterday.,4. You should have helped him. 5. I could have finished my homework,but your
10、 radio was too noisy. 6. You shouldnt have quarreled with him. 7. You ought to have been here five minutes earlier.,1. The sky is cloudy.You had better bring your raincoat along. It _this afternoon. A. may rain B. might rain C. may have rained D. might have rained,基础篇：,2. Peter _come with us tonight
11、,but he isnt very sure yet. A. must B. can C. may D. will,3. Where is my pen ? I _it. A. might lose B. would have lost C. should have lost D. must have lost,4.Such a businessman _honest ; he gets his money by dishonest ways. A. cant be B. cant have been C. may be D. may not be,5.-I rang your flat ye
12、sterday.A man answered but I didnt recognise the voice. -Oh,it _my brother Peter. A. must be B. must have been C. can have been D. might be,6. This _be a womans handkerchief. It _be a mans. A. cant ; may B. cant ; must C. must not ; can D. cant ; can,8.I didnt hear the phone. I _asleep. ( MET 89 ) A. must be B. must have been C. should be D. should have been,9.-The streets are all wet. -It _during the night. A. must be raining B. must rain C. might have rained D. must have rained,
