Unit8SectionA(GrammarFocus4c)课件人教版英语九年级全册

Unit8ItmustbelongtoCarla.SectionA(GrammarFocus-4c)Tolearntounderstandandusemust,might,couldTousemodalverbstomakeinferencesLeadinMynameisMary.Thereisapictureofmyfamily.Doyouknowwhosebedroomitis?It________Mary’s.It________Mary’ssister’s.It________Mary’sparents’.maybemustbecan’tbePresentationWhosevolleyballisthis?ItmustbeCarla’s.Shelovesvolleyball.Whosehairbandisthis?ItcouldbeMei’shairband.OritmightbelongtoLinda.Theybothhavelonghair.Whatdidyouseethatnight?I’mnotsure,butitcan’tbeadog.Itwasbigger.Ithinkitmightbeabearorawolf.

表示推测的情态动词在英语中，表示对某件事物的确定程度，即表示推测的时候，表示可能、怀疑、允诺、愿望、义务、必要、猜测等的动词就是情态动词。英语中表示推测的情态动词主要有must,can,could,may,might等。可能性:must>can/could>may/mightcannot(can’t)couldnot(couldn’t)maynotmightnot情态动词表推测情态动词表示推测时，无时态区别，只有语气差别1.must表示可能性最大的肯定推测，意思是“一定、准是”。含有must的句子（表推测）变为否定句时，要用can’t。must一般疑问句的否定回答用needn’t或don’thaveto，而不用mustn’t。mustn’t意为“不可以，不能”，表示禁止，不许可Hemustknowtheanswers./Hecan’tknowtheanswers.e.g.—Mustwehandinourexercisebooktoday?—Yes,youmust.(No,youneedn’t.)must还可表示有把握的推测，意为“一定、肯定”。must的过去式还是must。在回答以must开头的一般疑问句时，否定式需用needn’t，表示“不必”的意思。2.can可表示能力/允许/可能性/怀疑猜测，意为“可以，会，能”；can’t意为“不会，不能，不可以,不可能”could为can的过去式；could还可用于现在时态中表示委婉客气，相当于can；could也可表示惊讶怀疑，不相信。Hecan’tpickherschoolbagup.Theycanbereadinginthelibrary.could表示某事有可能发生或可能是事实。Don’teatit.Itcouldgobad.Theplanecouldbeputoffbythestorm.

could还可用于表示客气、礼貌、委婉的请求语气Couldyoupleasehelpmewithmyhomework?3.may,might表示推测“可能性”时，意思是“可能”，“也许”。might不表示过去时态，语气更委婉，可能性更小。may,might表推测时，可用于否定句，但不用于疑问句。Hemay/mightnotbeathome,butI’mnotsure.

情态动词表示推测的意义和用法句式情态动词含义用法肯定句must一定表示有把握的肯定推测may/might/could也许，可能表示没有把握的推测否定句couldn’t/can’t不可能表示有把握的否定推测maynot/mightnot可能不表示不太有把握的否定推测疑问句can/could可能表示推测不同形式的情态动词表示不同的含义情态动词+动词原形

表示对现在事情的推测情态动词+be+动词-ing

情态动词+have+动词的过去分词

表示对正在发生的事情的推测表示对过去情况的推测

ThisbookmustbeJim’sbecausehisnameisonit.Mymothermightbecookinginthekitchen.Thegroundiswet.Itmusthaverainedlastnight.

1.A:Where’sJean?

B:I’mnotsure.She__________(is/mightbe/

mustbe)inthelaboratory.2.A:Everyoneisgoingtothepoolafterschool.B:Really?It_________(mustbe/can’tbe

/

couldbe)hotoutdoors.mightbemustbe4aPractice3.A:That’sthephone.

B:Hmm.Iwonderwhoit________(mustbe/couldbe/shouldbe).4.A:IwonderiftheseareJim’sglasses.B:They________(can’tbe/mightbe/couldbe)his.

Hedoesn’twearglasses.5.A:Ihearwaterrunninginthebathroom.B:It____________(couldbe/mustbe/can’t

be)Carla.

Shewasthinkingoftakingashower.

couldbecan’tbecouldbe1.A:Manypeoplearewearingcoats.B:Theweathermustbe_________________________.2.A:Sallyhasbeencoughingalot.B:Shemightbe_____________________.gettingcolder/coldoutsidehavingasorethroat/illCompletetheseresponses.3.A:Thisrestaurantisalwaysverycrowded.B:Thefood________________.4.A:WheneverItrytoreadthisbook,Ifeelsleepy.B:Itcan’t______________.mustbedeliciousbethatboring4bLookatthispictureofaroom.Howmuchcanyoutellaboutthepersonwholiveshere?Isitaboyoragirl?Whatarehis/herhobbies?Discussyourideaswithapartner.A:Itcouldbeagirl’sroombecauseit’sverytidy.B:

Iguessso.Butitmightbeaboy’sroombecausetheclotheslooklikeboys’clothes.4c中考链接用情态动词的正确形式填空Afteralongwalk,you______feeltired.Theman______beMr.Li.HewenttoHKyesterday.Mymom__________________

gotovisitgrandpa.Iamnotsureofit.Thenotebook______beMary’sbecauseithashernameonit.mustcan’tmay/might/couldmust1.must,can/could,may/might等情态动词表推测肯定推测：must,can/could,may/might都可以表示肯定推测must

表示把握性极强的推测，意为“肯定、一定”can/co