1、Using language P17 Unit 2 Lets celebrate!He may be in his office.Where is Bob?What was the matter with the lady yesterday?Read the photos and sentenses below and make inferences.She might be ill yesterday.推理，推断Leading inThis restaurant must be very good.Its always full of people.That restaurant cant
2、 be very good.Its always empty.Which restaurant is better?He called me yesterday evening,but I didnt hear it.I must have been asleep.情态动词表推测must,can,could,may,mightModals(2)情态动词中:can,could,may,might,must 都可表示推测。两种句式：情态动词情态动词+动词原形动词原形情态动词情态动词+完成式完成式（表示对目前的动作或状态进行推测）（表示对已发生情况的推测）1.can 1.表示能力表示能力 The p
3、arrot can speak three languages.2.表示允许表示允许(could 更委婉，主要用于疑问句，更委婉，主要用于疑问句，回答是用回答是用Can)_Can/could I borrow the book from the library?-yes,you can./no,Im afraid not.3.理论上的可能性理论上的可能性有时会有时会 Shanghai can be very cold in March.4.推测，只用于否定句，疑问句推测，只用于否定句，疑问句he cant be in the library.(cant 不可能不可能)can this be t
4、rue?5.用于否定句，疑问句，感叹句，表示惊异，怀用于否定句，疑问句，感叹句，表示惊异，怀疑，不耐烦等语气疑，不耐烦等语气 how can you be so careless!How can I know2.can/could+have+done在在否定、疑问否定、疑问句中句中表示表示“对过去的可能性推测对过去的可能性推测“不可能不可能”could+have+done在肯定句中表示在肯定句中表示“本来本来可以做而未做可以做而未做”The door was locked.She couldnt have been at home.You could have been more carefu
5、l.3.Can not/can nevertoo cannotenough无论怎么无论怎么也不过分也不过分；越越越好；非常越好；非常 I cant thank you enough since it is a good thing,we cannot do it too soon1.May 1.表示表示允许允许”可以可以”might 语气更语气更委婉委婉2.表示可能性表示可能性(用于肯定句用于肯定句)3.表示表示祝愿祝愿 eg:1)May I come in?Yes,you can/may.No,you mustnt/cant 2)She may be still waiting for us
6、.3)May you have a happy holiday.2.may/might as well=had better3.may/might+have+done表示对过去动作的表示对过去动作的推测推测“也许是也许是”（might可可能性更能性更小小）Eg.He might have spoken to her yesterday.1.Must 1.表示表示必须必须,而而mustnt 表示表示“禁止、不禁止、不准许准许”2.表示肯定的推测表示肯定的推测,只用只用于肯定于肯定句句,”想必想必，准是，一定准是，一定”3.偏偏、偏要、硬要、非要（表示与说话偏偏、偏要、硬要、非要（表示与说话 人人
7、愿望相反或不耐烦）愿望相反或不耐烦）2.Must、have to must表示主观表示主观 have to表示客观需求表示客观需求3.must+have+done 对过去事情的肯定猜测。对过去事情的肯定猜测。Eg.The road is wet.It must have rained last night.Why must it always rain on weekends?If you must smoke,do it outside,please.You mustnt take photos here.Its forbidden.情态动词表虚拟may/might have done过去本
8、可能做过去本可能做而未做而未做could have done 过去过去本本可以做可以做而未做而未做should have doneought to have done过去本应该做过去本应该做而未做而未做shouldnt/oughtnt have doneneednt have done（无责备之意）过去（无责备之意）过去 本不必做本不必做却做了却做了1.I dont know where she is,she _ be in Wuhan.2.The road is wet.It _(rain)last night.3.Philip _(be hurt)seriously in the car accident.4.-Linda has gone to work,but her bicycle is still here.-She _(go)by bus.5.Mike _(find)his car,for he came to work by bus this morning.maymust have rainedmay(might)have been hurtmay(might)have gonecant have found根据句意，用情态动词的正确形式填空。根据句意，用情态动词的正确形式填空。
