初中情态动词讲解ppt课件.ppt

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1、Learning goals:,复习部分情态动词的用法,1,2,情态动词的新用法情态动词表示推测,3,对物品的归属进行猜测,思考？,你记得学过哪些主要的情态动词吗？,1,2,情态动词有哪些语法特征呢？,can.could,may,must，might,have to,3,情态动词如何使用呢？,1.情态动词有具体的词义。2.情态动词没有人称和数的变化。3.情态动词后必须跟动词原形，两者 一起构成谓语动词。4.一般疑问句提前边，否定句在后直接加 not.,can/can not,1.表示能力(会)1)Mary can speak English,but she can not speak Fren

2、ch.2)Can you lift this heavy box?3)Can you skate?2.表示允许(可以)1）Can I use your dictionary?2）-Can I go home now?-Yes,you can./No,you cant.,1.是can 的过去式；表示过去的能力；He could ride a bike at the age of five.2.用于婉转语气,多用于问句。“能，可以”Could you please clean the room?-Could I come to see you tomorrow?-Yes,you can.(No,y

3、ou cant.)此处 could 不是过去式，只是语气更委婉，答语中不能用could和 couldnt，要用can 和 cant。,could,may/may not,1.表示请求和允许(可以),比can正式.May I come in?Hemaycomeifhelikes.,may的用法:,may/may not,may的一般疑问句，其否定回答用 cant 或 mustnt。1.-May I go home now?-Yes,you may./Sure./Yes,please.No,you cant./mustnt.2.-May I use your washroom now?-No,yo

4、u _.Theres something wrong with the toilet.A.neednt B.mustnt C.shouldnt D.didnt,B,must/must not,must 必须,表示说话人的 主观意志。You must do your homework first.,must 的用法:,must/must not,mustnt 表示禁止，不准，不允许。You mustnt smoke here.Youmustntplaywithfire.,must not的用法:,must/must not,以must开头的疑问句，肯定回答：Yes,must.否定回答:No,ne

5、ednt.或 No,dont have to.-Must I clean the classroom now?-Yes,you_.-No,you _./No,you _.,must,neednt,dont have to,need作情态动词，主要用于疑问句和否定句中 need 一般疑问句:肯定回答用 Yes,must，否定回答用 No,neednt.或 No,dont have to.如：Need I do it now?Yes,you _。No,you _.need 作行为动词，有人称、数和时态的 变化后接to do，即 need to do sth.,need,must,neednt/do

6、nt have to,might/may,might 1.是 may 的过去式。2.表示推测,可能性较小。1)Hemightbeverybusynow.2)Yourmother mightknowthetruth.may 也表示猜测，意为“可能”。3)Where is my English book?It might/may be in your desk.,.用适当的情态动词填空：1.I can play football._you swim?2.I cant play with you.I _finish my homework first.3.I_ get up early tomorr

7、ow.because I have a meeting.4.Nobody _live without air.,Can,must,must,can,5._I come in?Yes,please.6._you please tell me where the station is?7.Must I finish the work now?No,you _.8.-Need I take this book out?-Yes,you _.A.can B.may C.need D.must9._ the girl read before she went to school?A.Can B.Must

8、 C.Can D.Could,May,Could,neednt,D,D,情态动词表示推测,Guessing game,Whose dog is this?,It might/could be_.,He is a singer and actor,he is known by everyone.,Whose dog is this?,It must be Liu Dehuas.,It might/could be_.,He is a singer and actor,he is known by everyone.,An actor,he is tall,cool and popular.,Wh

9、ose dog is this?,It might/could be_.,An actor,he is tall,cool and popular.,Whose dog is this?,It might/could be_.,It must be Zhang Hans.,He is a basketball player.,Whose car is this?,It might/could be _.,He is a basketball player.,Whose car is this?,It might/could be _.It must be_.It cant be _.,mine

10、,Yao Mings,He is rich but helpful.,Whose car is this?,It might/could be _.It cant be _.It must be_.,He is rich but helpful.,Whose car is this?,It might/could be _.It cant be _.I must be _.,mine,Bill Gates,情态动词表推测讲解,must 表示推测,must 表示非常肯定的或有把握的推测，意为“一定，必定”。只用在肯定句中，不能用于否定句中。,Eg.You have worked hard all

11、 day.You must be tired.,might,could 表示推测,语气更委婉，表示的可能性较小，说话中留有余地，意为“可能，也许，或许”。,1.The football might/could be Jacks.He likes all kinds of ball games.2.Liu Mei isnt here today.She might/could be ill.,cant 意为“不可能”,必用在否定句中。-The man cant be Mr.Green.-He has gone to America.,Groupwork,情态动词must,might,could,

12、cant 表示推测的含义与用法。情态动词must,might,could,cant 后面都接动词原形，都可以表示对现在情况的揣测或推断，但他们的含义有所不同：,must 一定，肯定（100%的可能性）,might,could 有可能，也许（20%80%的可能性）,cant 不可能，不会（可能性几乎为零）,活动探究,情态动词表示推测 常考的有：,对某事判断的程度：must could might cant,must,could,might,cant,练练吧,Choose must,might,could,cant,can to fill in the blanks.,1.The storyboo

13、k_ be hers.It has her name on it.2.The beautiful trousers _ be Lilys.Because theyre too long.3.I cant find my key.It_ be left at home.4.The volleyball_ be Sallys or Anns.They both like playing volleyball.5.The piano_ belong to Alice.She often plays the piano.,must,cant,could/might,might/could,might/

14、could,7.The pen_ belong to him.Its on his desk.,might/could,8.My mother _ be at home.She left home with me.She has gone to go to work.,cant,9.This basketball _ be Nings.He plays basketball every day.,could/might,10.This school uniform _ be Nicks.Its too small for him.,cant,6._that wallet yours?-No,i

15、t _be mine.Mine is here.,Can,cant,用must,could,cant,might填空。,1.-Excuse me,whose book is this?-It _ be Johns.It has his name on it.2.The man _ be my English teacher.He has gone to Canada.3.It _ be Jims football.He likes playing football very much.,must,cant,might/could,【例1】-Jim is reading a book under

16、 that tree.-It _ be Jim.He has gone to Hainan.A.may B.mustnt C.cant D.could,C,典型例题解析,【例2】-Where are you going this month?-We _ go to Xiamen,but were not sure.A.neednt B.must C.might D.mustnt,C,典型例题解析,【例3】Wheres Mr Li?I have something important to tell him.You _ find him.He _ Japan.A.may not,has gone

17、 to B.may not,has been to C.cant，has gone to D.cant,has been to,C,典型例题解析,【例4】Could I look at your pictures?Yes,of course you _.A.could B.can C.will D.might,B,典型例题解析,【例5】Where is Jack，please?He_be in the classroom.2013 杭州 A.can B.need C.would D.must,D,典型例题解析,学习物品的归属,(可能是Mary。),(不可能是Mary。),Mum:Who is

18、it?,J:It must be Tom.,M:It might/could be Mary.,J:It cant be Mary.She is in China.,(一定是Tom。),(可能是Kate。),(绝对不是Marry。),Mum:Who is it?Jim:(一定是Tom。),It must be Tom.,It might/could be Kate.,It cant be Marry.She is in China.,-It_ belong to Mark or Lili Because they both play football.,-Whose football is t

19、his?,might could must,Lili,Mark,-It_ belong to Bush.Because_,Bush,-Whose red bicycle is this?,cant,his bike is white and blue.,Can this T-shirt beJims?,It cant be Jims.,Because its too small for him.,Jim,Liu xiang,-It_ be Liu Xiangs.,-Whose exercise book is this?,must,It must belong to Liu Xiang,Bec

20、ause it has his name on it.,语言点：whose 谁的,1.Whose truck is that?(同义句)_ is that _?2.I think that is my fathers shirt.（就划线部分提问）_ shirt do you think _ _?3.By _ the car was invented?,Whose,that is,Whose,truck,whom,Whose is this?,It cant be xxs.,It must be xxs.,It could/might be xxs.,belong to xxx.,belong

21、 to xxx.,belong to xxx.,It is mine/yours/hers/his/ours.,=It belongs to me/you/her/him/us.,Its Li Pings.,=It belongs to Li Ping.,belong to sb(名词/代词的宾格)=be sbs(名词所有格/名词性物主代词),belong to 属于,1.不能用于进行时态2.不能用于被动语态3.belong to+名词或代词的宾格。4.常与名词性物主代词或名词所有格进行 句型转换,即：belong to+sb./代词宾格=be+sbs/名词性物主代词。,1.Who is th

22、e owner of the black box?(同义句转换)_ does the black box _ _?2.Would you like to have a _(野餐)with us this weekend?,课时训练,Who/Whom,belong to,picnic,3.This bike is Lucys.(同义句)This bike _ Lucy.4.It must be hers.(变否定句)It _ _ hers.5.-Whose storybook is this?-It _ Jack.I saw him reading just now.A.must be B.mu

23、st belong to C.is D.be belong to,belongs to,cant be,B,小结：情态动词归纳,can:1.表示能力，“能，会”2.表示允许，“可以”，Can I?较口语化。3.表示推测。cant 只用于否定句中。,could:1.是can 的过去式，表示过去的能力。2.could表示更为委婉的语气。3.表示猜测，“很可能”,may:1.表示许可，“可以”。2.以may引导的一般疑问句的否定回答cant/mustnt 用。3.表示推测，用于肯定句中。,might:1.是may的过去式。2.表示猜测，可能性比could小。,must：1.表示说话人的主观意志，“必

24、须”。2.mustnt 表示“禁止，不允许”。3.must引导的疑问句，否定回答用neednt/dont have to.4.must 表示猜测，”一定“，只用于肯定句中。,need:1.作情态动词时，用于疑问句和否定句。2.need引导的疑问句，肯定回答用 must，否定回答用neednt/dont have to。3.need作为行为动词，有人称和数的变化，后跟to do。,He must have a car now.（现在）他一定有辆小汽车。He must be doing his exercises in the classroom.（正在进行）他一定在教室里做练习。He must

25、have finished the work.（过去发生）他一定已完成了工作。,He may/might be sleeping now.The boy may/might not be watching TV at home.这个男孩可能没在家看电视These students may/might have seen the film before.（过去）这些学生以前可能看过这部电影。,1.It is eleven oclock.They _(have)classes.2.She is smiling.She _(know)the good news.,must be having,must have known,翻译:1.I must be dreaming.2.He might be running to catch a bus.3.He could be running for exercise.4.They must be making a movie.5.Many people are wearing coats.The weather _ be cold outside.6.I cant find my bag.I think somebody must have picked it up.,Thank you!,