HebeCurnane!Hebethinking.Hebeacommonboy.mustmightcan’t表推测的三种句式Thelightison,sosomebody_____beathome.mustThelightison,somysister___________beathome.may/might1.在肯定句中一般用must,may/might,语气逐渐减弱。常用于表推测的情态动词willwouldoughttoshould(一定)(可能)(很有可能)(很有可能)(应该,很有可能)(应该,很有可能)(可能)(可能)(可能)肯定推测最强最弱mustmightcancouldmayIt’ssunny.It______rain.can’t表推测的三种句式2.在否定句中用can’t/couldn’t(不可能),maynot/mightnot(可能不)。He______________knowhowtoanswerthisquestion./mightnotmaynot常用于表推测的情态动词(禁止,不许)(可能)(肯定不,不可能)(肯定不,不可能)(可能不)否定推测最强最弱mustnotmightnotcan’tcouldn’tmaynot(不用于推测)表推测的三种句式3.在疑问句中,一般只使用can/could。shehavefinishedherhomework?yoursisterbeathomenow?CouldCan【口诀】can不肯,may/could/might不问,must不否问注:can表示推测时,不用于肯定句;may/might/could表示推测时,不用于疑问句;must表示推测时,不用于否定句或疑问句。He____________tomusic.对现在或一般情况的推测“情态动词+be”“情态动词+bedoing”“情态动词+动词原形”mustbelistingHe_________athomenow.Thelightisn’ton.can’tbeHe_________inhisoffice.mayworkShe_________veryhappywhensheopensthedoor.对将来推测,“情态动词+动词原形”mustbeThegroundiswet.It_____________yesterdaynight.对过去或已经完成的推测,“情态动词+have+过去分词”mayhaverained表对已经发生的事情的推测,意为“一定,想必”,在句子中表示的是一种肯定的推测。这种结构一般只用于肯定句。1.musthavedone否定形式:can’t(couldn’t)havedoneTheyout,becausethelightisstillon.Hedidn’thearthephone.Heasleep.“不可能,肯定不会”musthavebeencan’thavegone表对过去的时间里可能发生的事情的推测,一般只用于否定句和疑问句。2.can/couldhavedoneHecan’thavefinishedtheworksosoon.用于肯定句中,常用来表示本来可以完成而实际未完成的动作。Wecouldhavewalkedtothestation,itwassonear.“本来能做…..(而实际上没做)”1)表对已经发生的事情不太肯定的推测,意为“可能已经,或许已经”3.may/mighthavedone2)虚拟用法:表可以做,但却没有做。Ifwehadtakentheotherroad,wemighthavearrivedearlier.Hemighthavegivenyoumorehelp,buthewasverybusy.三种句式常用于表推测的情态动词情态动词表推测的三种时态几组对过去的推测can/couldhavedonemusthavedonemay/mighthavedoneExercise:1.Whoseearringsarethese?They____________beMary’s.Shewearsearringssometimes.2.Carls_________________cometothepartytonight,butI’mnotsure.3.Thetelephoneisringing,butnobodyanswerit,he_______beathome.4.--IsthisLanQiang’sboxingglove?--Yes,it_________behis.Thisishisnameontheback.5.You’dbettertakeanumbrella.It____________rainthisafternoon.may/could/mightmustmay/might/couldcan’tmay/might/could6.It’sthelibrary!Soyou_______knowshoutingisnotallowedhere.7.--Haveyoudecidedwheretospendyoursummerholiday?--Notyet.We_______gotoQingdao.8.--IsJessicagivingusaspeechthisevening?--No,it_______beher.ShehasgonetoJapan.9.--Whatwilltheweatherbeliketomorrow?--It______berainy,cloudy,orsunny.Whoknow?10.You______betiredafterplayingsportsforalongtimewithoutarest.mustmaycan’tmightmust