Unit 2 Let's celebrate Using language 情态动词（ppt课件）-2023新外研版（2019）《高中英语》必修第二册.pptx

1、Unit 2 Lets celebrate Modals(2)回归第回归第1单元学习的情态动词单元学习的情态动词can,couldmust,havebe able todareneedLook at the sentences from the reading passage and answer the questions.a That is why Letters from Father Christmas could be the perfect bookb The children must have been very excited as they opened it.c they

2、 might not receive their presents if they were not good.01Discovering the rules1)What do the words in red indicate:an order,a request,ability or possibility?The words in red indicate possibility.v.表明表明,显示显示n.请求请求,要求要求a That is why Letters from Father Christmas could be the perfect bookb The children

3、 must have been very excited as they opened it.c they might not receive their presents if they were not good.01Discovering the rules2)Will the meaning of sentence(a)change if we replace“could”with“must”or“might”?If we replace“could”with“must”,the meaning of sentence(a)will change.a That is why Lette

4、rs from Father Christmas could be the perfect bookb The children must have been very excited as they opened it.c they might not receive their presents if they were not good.01Discovering the rules3)What happens if we change“must”and“might”in sentences(b)and(c)into“could”?If we change“must”in sentenc

5、e(b)into“could”,it means the speaker is not sure about the statement,and its only a possibility.a That is why Letters from Father Christmas could be the perfect bookb The children must have been very excited as they opened it.c they might not receive their presents if they were not good.01Discoverin

6、g the rules情态动词情态动词must,can/could,may/might均可表示推测均可表示推测,它们可它们可以对过去、现在或将来的情况作出语气强弱不同的推测。以对过去、现在或将来的情况作出语气强弱不同的推测。1.表示肯定的推测时：表示肯定的推测时：各情态动词各情态动词语气从弱到强语气从弱到强依次为依次为 might may could can must；把握推测语气的特点，选择恰当的情态动词。把握推测语气的特点，选择恰当的情态动词。02Studying the rules表示否定的推测时：表示否定的推测时：cant/couldnt语气较强，意为语气较强，意为“不可能不可能”；m

7、ay not/might not语气较弱，意为语气较弱，意为“可能不可能不”。must的否定形式的否定形式mustnt不表不表示否定推测，而是表示示否定推测，而是表示“不许不许可可”或或“不应该不应该”。02Studying the rules1.用于肯定句用于肯定句,表示客观可能性表示客观可能性,意为意为“可能可能”,即从理论上看是可能的即从理论上看是可能的,但不一但不一定会发生定会发生 As a human being,anyone can make a mistake.作为人类,任何人都有可能犯错。2.用于否定句或疑问句用于否定句或疑问句,表示对现在的动作或状态进行主观的猜测表示对现在的

8、动作或状态进行主观的猜测,意为意为“可可能能”,或表示惊异、怀疑等态度。或表示惊异、怀疑等态度。a.He cant have a lot of money.他不可能有很多钱。b.Can it be that it was l who was mistaken?难道是我弄错了?Grammar 1 can+动词原形动词原形表推测表推测could+动词原形动词原形,意为意为“可能可能”,可以指过去的情况可以指过去的情况,也可以指现在也可以指现在的情况的情况,语气缓和。多用于否定句或疑问句。语气缓和。多用于否定句或疑问句。a.He looks young.He couldnt be over 50.他

9、看起来很年轻,不可能超过50岁。b.Could it be true?那可能是真的吗?Grammar 2 could+动词原形动词原形表推测表推测1.表示主观的推测表示主观的推测,意为意为“或许或许”,用于肯定句和否定句均可。用于肯定句和否定句均可。a.He may be very busy now.他现在可能很忙。b.He may not be at home.他可能不在家。注意:表示可能性时,cant语气较强,表示“不可能”;may not语气较弱;表示“可能不,或许不”。Grammar 3 may+动词原形动词原形表推测表推测might+动词原形动词原形,表示推测表示推测,意为意为“可能

10、可能,可以指过去的情况可以指过去的情况,也可以也可以指现在的情况指现在的情况,但语气比但语气比may更加不肯定。用于肯定句或否定句均更加不肯定。用于肯定句或否定句均可。可。a.They might have a lot of work to do now but Im not sure.他们现在可能有很多活儿要干,不过我不确定。b.She was afraid they might not like the idea.她担心他们可能不喜欢这个想法。Grammar 4 might+动词原形动词原形表推测表推测must+动词原形动词原形,表示猜测表示猜测,意为意为“准是准是,一定一定”,通常用于肯

11、定句。通常用于肯定句。a.This must be your room.这一定是你的房间。b.Look at his new car.He must have a lot of money.瞧他那辆新车。他肯定很有钱。Grammar 5 must+动词原形动词原形表推测表推测课堂小练课堂小练选词填空(包含否定式)can,could,may,might,must(可重复选)1.Helen go on a trip with us,but she isnt quite sure.2.My sister met him at the theatre last night,so he have att

12、eneded your lecture.3.-I am sure I saw Brian in the park this morning.-You be imagining things.He left for America last night.4.We have face the diffculty together,but why didnt you tell me?5.If you _ smoke,please go outside.may/mightcant/couldntmustmustcould(At a fancy dress party)Chris:I spent age

13、s putting up all the balloons and flowers last night.Jean:I expect you are feeling tired now!Chris:Yes,I am.Look that guy is dressed as Batman.Is that Mike?Jean:Its possibly him.Check out that girl over there.Im sure thats Lucy.You must be tired now!It may/might/could be him.That must be Lucy!Rewrit

14、e the underlined sentences in the conversation using can/could,may/might and must.Chris:No,I dont think thats Lucy.Lucy isnt that tall.Jean:Look at those two guys dressed as chickens!Oh,theyre waving at us!Maybe theyre from our school.Chris:Lets go and find out.that cant be Lucy!They may/might/could

15、 be from our school.Rewrite the underlined sentences in the conversation using can/could,may/might and must.Look at the picture and make as many sentences as possible using can/could,may/might and must.The woman in red must be very excited to buy so many things.The man with a wallet in his hand migh

16、t be a bit reluctant to pay.The woman in glasses may be very tired to get up so early and carry so many bags.The cashier might be feeling uncomfortable as he is sweating a lot.1.can+完成式完成式,表示对已发生情况的推测表示对已发生情况的推测,主要用于否定句或疑问句。主要用于否定句或疑问句。a.You cant have forgotten her.你不可能已经忘记她了。b.Where can she have pu

17、t it?她到底把它放在哪儿了呢?2.could+完成式完成式,表示对过去情况的推测表示对过去情况的推测,多用于否定句或疑问句。多用于否定句或疑问句。a.He could not have been more than 16 at that time.他当时不可能超过16岁。b Could she have forgotten my address?她会忘记我的地址吗?Grammar 6 情态动词情态动词+完成式完成式的用法的用法3.may/might+完成式完成式,表示对已发生事情的不肯定的推测表示对已发生事情的不肯定的推测,mght相比相比may语气更加不肯定。语气更加不肯定。He may

18、/might have come by train.他可能是坐火车来的。4.must+完成式完成式,表示对已发生情况的推测表示对已发生情况的推测,通常用于肯定句。通常用于肯定句。She must have gone home.她肯定已经回家了。Grammar 6 情态动词情态动词+完成式完成式的用法的用法情态动词表推测情态动词表推测1.He is right.2.He must be right.3.He will be right.4.He would be right.5.He ought to be right.6.He should be right.7.He may be right

19、.8.He could be right.9.He might be right.certainalmost certainuncertain真题链接真题链接1.(2021天津天津6月卷月卷)-I honestly dont think Im going to be admitted.-Well,you never know!You_ a better impression than you think.A.may have madeB.should have madeC.couldnt have madeD.neednt have made2.(江苏江苏巻巻)-I left my handb

20、ag on the train,but luckily someone gave it to a railway official.-How unbelievable to get it back!I mean,someone_it.A.will have stolenB.might have stolenC.should have stolenD.must have stolenAB真题链接真题链接3.(江苏江苏巻巻改编改编)It was sad to me that they,so poor themselves,_bring me food.A.canB.shouldC.mustD.ne

21、edB课堂小练课堂小练1.I dont really like James.Why did you invite him?Dont worry.He _ come.He said he wasnt certain what his plans were.A.must notB.need notC.would notD.might not2.The traffic is heavy these days.I _arrive a bit late,so could you save me a place?A.can B.must C.need D.might3.One of the few things you _say about English people with certainty is that they talk a lot about the weather.A.need B.must C.should D.canDDDThank you!