情态动词表示推测ppt课件

.,情态动词表示推测的用法,1.对现在(事情)推测,2.对过去(事情)推测,must+v.(肯定)might/could/may/can+v.(可能)cant+v.(不可能),1.musthavedone(表肯定性推测)“肯定,准是,”,cant/couldnthavedone(表否定性推测)“不可能”,2.may/mighthavedone(表可能性推测)可能,也许,3.should/oughttohavedone(表本该做而实际未做的事),shouldnt/oughtnttohavedone(表本不该做而实际已做的事),4.neednthavedone(表本不必做而实际己做,造成浪,费,遗憾,不好后果),.,情态动词表示推测的用法,1.对现在(事情)推测：（情态动词+动词原形）,must+v.(肯定)may/might/could/can+v.(可能)cant+v.(不可能),2.对过去(事情)推测：（情态动词+完成式）,musthavedone(表肯定性推测)“肯定,准是,”,cant/couldnthavedone(表否定性推测)“不可能”,Itmusthaverainedlastnight,fortheroadiswet.(Itcant/couldnthaverainedlastnight.),.,1.Itmusthaverainedlastnight.fortheditch(水道,渠道)isfullofwater.,2.-Canithavebeenacomfortablejourney?,3.Tenpassangerswereinacar!Itcanthavebeenacomfortablejurnery.,.,4.HemayhavegonetoBeijingyesterday.(可能性大)5HemighthavegonetoBeijingyesterday.(可能性小),.,6.Therewasplentyoftime.Sheneednthavehurried.7Youshouldhavecometothemeeting.,.,1.-HemustbeMr.Li.(肯定是)-No,hecantbeMr.Li.Mr.LihasgonetoBritain.(不可能是),2.Wemaybelateforclass.Itsalreadyseventofive.(也许),3.Youmustntplaywithfire!,.,另外,在虚拟语气中还有:wouldhavedone表示“本来会.”但实际上并没有发生,Youshouldhavecomeearlier,otherwiseyouwouldhavemethim.你本该早点来，否则的话，你就会遇见他（实际上没有早来，也没见到他）,.,must表推测的反意疑问句:反意问句部分永远不带must.1.Shemustbeateacher,isntshe?2.ShemusthavegonetoShanghai,hasntshe?3.ShemusthavegonetoShanghaiyesterday,didntshe?,.,特殊疑问句疑问词+doyou,Thinksuggestbelieveimag