PrinciplesofClass7musthavetooughttocancouldmaymightmusthadbettershouldhavegottomustcan’tcanmaymightGuessGuesscouldcanpositiveguessdialogue?Guessinwhichboxtheprincessis.(workbookexercise)Practicemakesperfect!A:Someoneiscoming.Whocanitbe?CanitbeMr.Li?B:Itcan’tbehim.HehasgonetotheStates.“Can”表示猜测用在疑问句中在否定句中可以用couldnot,maynotormightnot.---IsJohncomingbytrain?---Heshould,buthemaynot.Helikesdrivinghiscar.(NMET2002)Playingfootballcanbeexciting.Anyonewhowantstotrycanbesuccessful.只要肯尝试，每个人都可能会成功。Can也可用于肯定句，指理论或逻辑上的可能性（可能是，也许会，会）must/may/might+do/be表示对现在情况推测(肯定，可能，也许…)must/may/might+doing表一种动作的进行性(肯定，可能，也许正在…)must/may/might+havedone表示对过去情况推测(肯定，可能，也许已经…)There’salotofnoisefromnextdoor.Theymustbehavingaparty.MrYunmustbeinthedomitoryThere‘snolightinherroom.Shemighthavegoneout.Thegroundissowet,itmusthaverainedlastnight.6.MyEnglish-Chinesedictionaryhasdisappeared.Who____havetakenit?a.shouldb.mustc.couldd.would7.MysistermethimattheGrandTheateryesterdayafternoon,sohe______lecture.a.couldn’thaveattendedb.needn’thaveattendedc.mustn’thaveattendedd.shouldn’thaveattended8.----CouldIborrowyourdictionary?----Yes,ofcourseyou____.(NMET1992)a.mightb.willc.cand.shouldThechildrenmusthavewateredthetomatoesyesterday,_______they﹖TheministermusthavearrivedinShanghai,_______he﹖didn’thasn’tYoucan’tbeserious,_____you?areYoumayhavenoticedsomethingbeforeIcame,_______you?hadn’t拓展A:Whoarethetwopersonsoverthere?B:Theymightbetourists…A:Tourists?Theycan’tbe,I’mafraid.Touristsusuallytakecameras,andcapswiththem.B:You’reright.Theycouldbeactors.Yousee,theylookbeautiful.A:I’mafraidIcan’tagreewithyou.Theymustbewritersorphotographers,Ithink.B:Theymaybewriters;butcantheybePhotographers?Don’tphotographerstakecameraswiththem?A:Right,theycan’tbephotographers.A:Whoarethetwopersonsoverthere?B:Theymightbetourists…A:Tourists?Theycan’tbe,I’mafraid.Touristsusuallytakecameras,andcapswiththem.B:You’reright.Theycouldbeactors.Yousee,theylookbeautiful.A:I’mafraidIcan’tagreewithyou.Theymustbewritersorphotographers,Ithink.B:Theymaybewriters;butcantheybePhotographers?Don’tphotographerstakecameraswiththem?A:Right,theycan’tbephotographers.ThemorewePractice,thehappierweare!entertainmentCan’tbe/doCan’tbedoingsth.不可能正在做…Can’thavedonesth.不可能已经做…Couldhavedone可能已经…本来能够而…Icouldhavedonebetter.Mr.Browncan’thavebeentoChina.Theycan’tbetalkingaboutyou.Hermothercouldhaveknownaboutthetruth.
