初中情态动词讲解优质PPT.ppt

1、1.情态动词有具体的词义。情态动词有具体的词义。2.情态动词没有人称和数的变化。情态动词没有人称和数的变化。3.情态动词情态动词后后必须跟必须跟动词原形动词原形，两者，两者一起构成谓语动词。一起构成谓语动词。4.一般疑问句提前边，一般疑问句提前边，否定句在后直接加否定句在后直接加not.can/cannot1.表示能力表示能力（会会）1）MarycanspeakEnglish,butshecannotspeakFrench.2）Canyouliftthisheavybox?3）Canyouskate?2.表示允许表示允许（可以可以）1）CanIuseyourdictionary?2）-CanI

2、gohomenow?-Yes,youcan./No,youcant.1.是是can的过去式；的过去式；表示过去的能力；Hecouldrideabikeattheageoffive.2.用于婉转语气用于婉转语气,多用于问句。多用于问句。“能，可以能，可以”Couldyoupleasecleantheroom?-CouldIcometoseeyoutomorrow?-Yes,youcan.（No,youcant.）此处此处could不是过去式，只是语气更委婉，不是过去式，只是语气更委婉，答语中不能用答语中不能用could和和couldnt，要用要用can和和cant。couldmay/maynot

3、1.表示请求和表示请求和允许允许（可以可以）,比比can正式正式.MayIcomein?Hemaycomeifhelikes.may的用法的用法:may/maynotmay的的一般一般疑问句，其否定回疑问句，其否定回答答用用cant或或mustnt。1.-MayIgohomenow?-Yes,youmay./Sure./Yes,please.No,youcant./mustnt.2.-MayIuseyourwashroomnow?-No,you_.Theressomethingwrongwiththetoilet.A.needntB.mustntC.shouldntD.didntBmust/m

4、ustnotmust必须必须,表示说话人的表示说话人的主观意志。主观意志。Youmustdoyourhomeworkfirst.must 的用法的用法:must/mustnotmustnt表示禁止表示禁止，不准，不允许。，不准，不允许。Youmustntsmokehere.Youmustntplaywithfire.must not的用法的用法:must/mustnot以以must开头的开头的疑问句疑问句，肯定回答：肯定回答：Yes,must.否定回答否定回答:No,neednt.或或No,donthaveto.-MustIcleantheclassroomnow?-Yes,you_.-No,

5、you_./No,you_.mustneedntdonthavetoneed作作情态动词，情态动词，主要用于主要用于疑问句疑问句和和否定句否定句中中need一般疑问句一般疑问句:肯定回答用肯定回答用Yes,must，否定回答用否定回答用No,neednt.或或No,donthaveto.如：如：NeedIdoitnow?Yes,you_。No,you_.need作作行为动词行为动词，有人称、数和时态的，有人称、数和时态的变化后接变化后接todo，即即needtodosth.needmustneednt/donthavetomight/maymight1.是是may的过去式。的过去式。2.表示推

6、测表示推测,可能性较小。可能性较小。1）Hemightbeverybusynow.2）Yourmothermightknowthetruth.may也表示猜测，意为也表示猜测，意为“可能可能”。3）WhereismyEnglishbook?Itmight/maybeinyourdesk.用适当的情态动词填空：用适当的情态动词填空：1.Icanplayfootball._youswim?2.Icantplaywithyou.I_finishmyhomeworkfirst.3.I_getupearlytomorrow.becauseIhaveameeting.4.Nobody_livewithou

7、tair.Canmustmustcan 5._Icomein?Yes,please.6._youpleasetellmewherethestationis?7.MustIfinishtheworknow?No,you_.8.-NeedItakethisbookout?-Yes,you_.A.canB.mayC.needD.must9._thegirlreadbeforeshewenttoschool?A.CanB.MustC.CanD.CouldMay Could neednt D D Whose dog is this?It might/could be_.He is a singer an

8、d 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.Anactor,heistall,coolandpopular.Whosedogisthis?Itmight/couldbe_.Anactor,heistall,coolandpopular.Whosedogisthis?Itmight/couldbe_.ItmustbeZhangHans.He is a basket

9、ball 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_.Itcantbe_.mineYaoMingsHeisrichbuthelpful.Whosecaristhis?Itmight/couldbe_.Itcantbe_.Itmustbe_.Heisrichbuthelpful.Whosecaristhis?Itmight/couldbe_.Itcantbe_.Imustbe_.mineBill Ga

10、tes情态动词表推测讲解情态动词表推测讲解must表示推测表示推测must表示非常肯定的或有把握的推测，表示非常肯定的或有把握的推测，意为意为“一定，必定一定，必定”。只用在肯定句中，不能用于否定句中。Eg.Youhaveworkedhardallday.Youmustbetired.might,could表示推测表示推测语气更委婉，表示的可能性较小，说话中留语气更委婉，表示的可能性较小，说话中留有余地，意为有余地，意为“可能，也许，或许可能，也许，或许”。1.Thefootballmight/couldbeJacks.Helikesallkindsofballgames.2.LiuMeiis

11、ntheretoday.Shemight/couldbeill.cant意为意为“不可能不可能”,必用在否定句中。必用在否定句中。-The man cant be Mr.Green.-He has gone to America.情态动词情态动词must,might,could,cant 表示推测表示推测的含义与用法。的含义与用法。情态动词情态动词must,might,could,cant 后面都接后面都接动词原形动词原形，都可以表示对现在情况的揣测或推断，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：但他们的含义有所不同：must 一定，肯定（一定，肯定（100%的可能性）的可能性

12、）might,could 有可能，也许（有可能，也许（20%80%的可能性）的可能性）cant 不可能，不会（可能性几乎为零）不可能，不会（可能性几乎为零）活动探究活动探究 意思意思推推测程度程度must一定，肯定一定，肯定用于非常确定的推用于非常确定的推测maymight/could有可能，有可能，也也许用于不确定的推用于不确定的推测can/cant不可能，不可能，不会不会在疑在疑问句和否定句中句和否定句中表推表推测 情态动词表示推测情态动词表示推测 常考的有：常考的有：对某事判断的程度：must could might cantmust,could,might,cantChoose mus

13、t,might,could,cant ,can to fill in the blanks.1.The storybook_ 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 oft

14、en plays the piano.mustcantcould/mightmight/couldmight/could7.The pen_ belong to him.Its on his desk.might/could8.My mother _ be at home.She left home with me.She has gone to go to work.cant9.This basketball _ be Nings.He plays basketball every day.could/might10.This school uniform _ be Nicks.Its to

15、o small for him.cant6._that wallet yours?-No,it _be mine.Mine is here.Cancant用用用用must,could,cant,mightmust,could,cant,might填空。填空。1.-Excuseme,whosebookisthis?-It_beJohns.Ithashisnameonit.2.Theman_bemyEnglishteacher.HehasgonetoCanada.3.It_beJimsfootball.Helikesplayingfootballverymuch.must cant might/could【例例1】-Jim is reading a book under that tree.-It _ be Jim.He has gone to Hainan.A.may B.mustnt C.cant D.could C典型例题解析典型例题解析【例例2】-Where are you going this month?-We _ go to Xiamen,but were not sure.A.neednt B.must C.might D.mustnt C典型例题解析典型例题解析【例例3