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1、Unit8ItmustbelongtoCarla.语法情态动词表推测一.情态动词的用法有很多,其中表示推测是其重要用法之一.可以用来表示推测的情态动词主要有must，may，might，can，could,情态动词表示推测可以分为以下几种情况:1.情态动词+do表示对现在或将来情况的推测和判断：Hemustbeinyourroom.2.情态动词+havedone表示对过去情况的推测和判断：Theroadiswet,Itmusthaverainedlastnight.3.情态动词+bedoing表示对现在或将来正在
2、进行的情况的推测和判断：Atthismoment,myfathercan’tbeworkingintheoffice.二.must，may，might，can，could表示推测时含义有所不同must“一定，肯定”(100%的可能性)may,might,could“有可能，也许”(20%－80%的可能性) can’t“不可能，不会”(可能性几乎为零)注意:表示推测是can不用于肯定句中,肯定句中表示“可能”用may/might/could.Thedictionarymustbemine.Ithasmynameon
3、it.TheCDmight/could/maybelongtoTonybecausehelikeslisteningtopopmusic.Thehairbandcan’tbeBob’s.Afterall,heisboy!(1)—Where’sJeff?—I’mnotsure.Hebeplayingfootballontheplayground.A.needB.mightC.mustD.can(2)Hecomeandseeyounextweek.ButI’mnotsure.A.mightB.mustC.need13
4、Unit8ItmustbelongtoCarla.知识点(3)—Tom,gotoanswerthedoor,please.ItbeyourMom.—No,Dad.Itbeher.Shewillbebackafterthreeo’clock.A.may;mustn’tB.must;can’tC.must;mustn’t(4)Henrybeathome,becausehephonedmefromBeijingjustnow.A.mustn’tB.can’tC.must(5)—WhereisJack,please?—I
5、’msure,hebeinthereadingroom.A.canB.mightC.must(6)TheshortgirlbeAlice.Sheisofmediumheight.A.mustn’tB.can’tC.maynot(7)—Whosebookisthis?—It________beLusy’s.Hernameisonit.A.couldB.can’tC.mustD.might根据句意，用适当的情态动词填空1.Sheknowtheanswer,butI’mnotsure.2.LiMingbeinShang
6、hai,becausehehasgonetoHangzhou.3.Don’tplaywiththeknife.Youhurtyourself.4.Ateacheralsomakeamistakeifheorsheisnotcarefulenough.5.Oh,dear!Youhavewalkedsolongonsuchahotday!Youbetiredandthirsty.6.—Whoisthemanoverthere?IsitMrWang?—No,itbehim.MrWanghascurlyhair.7.Th
7、eysawsomethingintheskylastnight.ItaUFO.8.YaoLeisaidhelate,buthecameontime.SectionA1.must的用法(1)must表示推测时，意为“一定”，通常与be连用，只用于肯定句中。Theremustbesomethingwrongwiththecomputer.13Unit8ItmustbelongtoCarla.知识点(2)must表示“必须”时，可用于肯定句、否定句或疑问句中；用于否定句中时，mustn’t的意思是“一定不要，禁止”。Y
8、oumustn’tplaysoccerinthesquare.(3)以must开头的一般疑问句，肯定回答用must，否定回答用needn’t或don’thaveto。—MustIgohomenow?—Yes,youmust/No,youneedn’t/No,youdon’thaveto(1)—MustIbeinhospitalforaweek,Doctor?—No,you
