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1、实用标准文档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
2、在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.Ithasmynameonit.T
3、heCDmight/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.need文案大全实用标准文档(
4、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’msure,hebeinthereadingroom.A.canB
5、.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.LiMingbeinShanghai,becausehehasgonetoHangzhou.3.Don’tp
6、laywiththeknife.Youhurtyourself.4.Ateacheralsomakeamistakeifheorsheisnotcarefulenough.5.Oh,dear!Youhavewalkedsolongonsuchahotday!Youbetiredandthirsty.6.—Whoisthemanoverthere?IsitMrWang?—No,itbehim.MrWanghascurlyhair.7.Theysawsomethingintheskylastnight.ItaUFO.8.Yao
7、Leisaidhelate,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.文案大全实用标准文档(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”。Youmustn’tplaysoccerinthesquare.(3)以must开头的一般疑问句,肯定回答用must,否定回答用needn’
8、t或don’thaveto。—MustIgohomenow?—Yes,youmust/No,youneedn’t/No,youdon’thaveto(1)—MustIbeinhospitalforaweek,Doctor?—No,you.Youcangobackhometomorrow.A.mustn’