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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 Tom.,Use so
2、me 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,might。,Could I use
3、 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),must,can/could,may/migh
4、t,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 take a walk here,_?,表示推测时，其反意
5、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 will come or not.He must come t
6、onight.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
7、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 teacher may not be serious.,May I leave now?,3.May/might hav
8、e 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 doneMight have doneCould have doneCan have doneShould have doneOught to have doneShouldnt have doneCant have doneCouldnt 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
9、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 radio was too noisy.6.You shouldnt have quarreled with him.7.You ought to have been h
10、ere five minutes earlier.,1.The sky is cloudy.You had better bring your raincoat along.It _this afternoon.A.may rainB.might rainC.may have rainedD.might have rained,基础篇：,2.Peter _come with us tonight,but he isnt very sure yet.A.mustB.canC.mayD.will,3.Where is my pen?I _it.A.might loseB.would have lo
11、stC.should have lostD.must have lost,4.Such a businessman _honest;he gets his money by dishonest ways.A.cant beB.cant have beenC.may beD.may not be,5.-I rang your flat yesterday.A man answered but I didnt recognise the voice.-Oh,it _my brother Peter.A.must beB.must have beenC.can have beenD.might be
12、,6.This _be a womans handkerchief.It _be a mans.A.cant;mayB.cant;mustC.must not;canD.cant;can,8.I didnt hear the phone.I _asleep.(MET 89)A.must beB.must have beenC.should beD.should have been,9.-The streets are all wet.-It _during the night.A.must be rainingB.must rainC.might have rainedD.must have rained,
