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1、UnitFourGrammar ModalVerbs情态动词must,might,may,can,could1.TheyholdaclassmeetingeveryMonday.(astatementoffact)2.TheymightholdaclassmeetingeveryMonday.(themodalverbmightexpressesapossibility)3.TheycannotholdaclassmeetingeveryMonday.(themodalverbcannotmeansthati
2、tisnotpossibleforthestudentstohaveaclassmeetingnextMonday.)4.Theymusthaveheldaclassmeetingyesterday.(themodalverbmusthavedonemeansthatthespeakerbelievestheyalmostcertainlyheldaclassmeetingyesterday.)e.g.1.Hecan’tbethere.Iwastherejustafewminutesago.2.Hemustb
3、ewritinghispapersinthereadingroom.3.FewpeoplemayhaveevenheardofVanGogh.4.VanGoghcouldn’thavepaintedthis—it’stoonew.5.VanGoghworkedinanartdealer’scompany,buthemusthavedislikedit,becauseheleft.情态动词must,may,might,can,could还有表示推测的用法对当前一般情况的推测：must+be+名词/短语/形容词m
4、ay/might+be+名词/短语/形容词用于肯定句can/could(not)+be+名词/短语/形容词用于否或疑A:Canthisnewsbetrue?B:Yes,itmustbetrue.C:No,itcan’tbetrue.D:Yes,itmaybetrue,Ithink.(Probablyitistrue.)用于肯或否情态动词表示推测：对现在（或将来）的动作(状态)的推测：主语+情态动词+动词原形1.Theyoungladystandingtherewithabookinherhandmustbeo
5、urnewteacher.2.Theyounggirlcan’tbeournewchairman.3.Can/Couldthenewsbetrue?4.Theyoungladymay/mightbeournewsecretary.Practice:1.因为他和Paul长得很象，所以人们认为他肯定是Paul的兄弟。AshelookslikePaulsomuch,peoplethinkhemustbePaul’sbrother.2.既然老师现在不在办公室，那她有可能在教室。Sincetheteacherisnot
6、intheofficenow,shemaybeintheclassroom.3.从他的表情来判断，他刚才所说的话不可能是真的。Judgingfromhisexpression,whathesaidjustnowcan’tbetrue.A:Whatcanmyfatherbedoing?B:Hemustbeworkingattentivelynow.Don’tdisturbhim.（Probablyheisworking.）对正在发生的情况的推测：must+bedoing肯定正在做某事may/might+bedo
7、ing也许正在做某事can/could(not)+bedoing不可能正在做某事1.Theymustbearguing.ButIaminterestedinwhattheycouldbearguing?2.Hecan’tbereadingintheroom,forIsawhiminthestreetjustnow.3.隔壁房间很吵，他们肯定正在为他们的女儿举行生日party。Asitisnoisyinthenextroom,theymustbehavingabirthdaypartyfortheirdaugh
8、ter.4.雨下得那么大，他们还会在等我们吗？Sinceitisrainingsoheavily,cantheystillbewaitingforus?5.他不可能正在打篮球，他肯定在教室。Hecan’tbeplayingbasketball,sohemustbeintheclassroom.e.g.1:A:HasTomarrived?B:No,hemayhavemissedthebus.(Prob
