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1、UnitFourGrammar ModalVerbs情態(tài)動詞must,might,may,can,could1.TheyholdaclassmeetingeveryMonday.(astatementoffact)2.TheymightholdaclassmeetingeveryMonday.(themodalverbmightexpressesapossibility)3.TheycannotholdaclassmeetingeveryMonday.(themodalverbcannotmeansthatitisnotpossibleforthestudentstohaveaclassme
2、etingnextMonday.)4.Theymusthaveheldaclassmeetingyesterday.(themodalverbmusthavedonemeansthatthespeakerbelievestheyalmostcertainlyheldaclassmeetingyesterday.)e.g.1.Hecan’tbethere.Iwastherejustafewminutesago.2.Hemustbewritinghispapersinthereadingroom.3.FewpeoplemayhaveevenheardofVanGogh.4.VanGoghcoul
3、dn’thavepaintedthis—it’stoonew.5.VanGoghworkedinanartdealer’scompany,buthemusthavedislikedit,becauseheleft.情態(tài)動詞must,may,might,can,could還有表示推測的用法對當(dāng)前一般情況的推測：must+be+名詞/短語/形容詞may/might+be+名詞/短語/形容詞用于肯定句can/could(not)+be+名詞/短語/形容詞用于否或疑A:Canthisnewsbetrue?B:Yes,itmustbetrue.C:No,itcan’tbetrue.D:Yes,itma
4、ybetrue,Ithink.(Probablyitistrue.)用于肯或否情態(tài)動詞表示推測：對現(xiàn)在（或?qū)恚┑膭幼?狀態(tài))的推測：主語+情態(tài)動詞+動詞原形1.Theyoungladystandingtherewithabookinherhandmustbeournewteacher.2.Theyounggirlcan’tbeournewchairman.3.Can/Couldthenewsbetrue?4.Theyoungladymay/mightbeournewsecretary.Practice:1.因為他和Paul長得很象，所以人們認(rèn)為他肯定是Paul的兄弟。Ashelooksli
5、kePaulsomuch,peoplethinkhemustbePaul’sbrother.2.既然老師現(xiàn)在不在辦公室，那她有可能在教室。Sincetheteacherisnotintheofficenow,shemaybeintheclassroom.3.從他的表情來判斷，他剛才所說的話不可能是真的。Judgingfromhisexpression,whathesaidjustnowcan’tbetrue.A:Whatcanmyfatherbedoing?B:Hemustbeworkingattentivelynow.Don’tdisturbhim.（Probablyheisworking
6、.）對正在發(fā)生的情況的推測：must+bedoing肯定正在做某事may/might+bedoing也許正在做某事can/could(not)+bedoing不可能正在做某事1.Theymustbearguing.ButIaminterestedinwhattheycouldbearguing?2.Hecan’tbereadingintheroom,forIsawhiminthestreetjustnow.3.隔壁房間很吵，他們肯定正在為他們的女兒舉行生日party。Asitisnoisyinthenextroom,theymustbehavingabirthdaypartyfortheir
7、daughter.4.雨下得那么大，他們還會在等我們嗎？Sinceitisrainingsoheavily,cantheystillbewaitingforus?5.他不可能正在打籃球，他肯定在教室。Hecan’tbeplayingbasketball,sohemustbeintheclassroom.e.g.1:A:HasTomarrived?B:No,hemayhavemissedthebus.(Prob
