情态动词表示推测

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)can’t+v.(不可能)1.musthavedone(表肯定性推测)“肯定,准是,”can’t/couldn’thavedone(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)shouldn’t/oughtn’ttohavedone(表本不该做而实际已做的事)4.needn’thavedone(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)can’t+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,”can’t/couldn’thavedone(表否定性推测)“不可能”Itmusthaverainedlastnight,fortheroadiswet.(Itcan’t/couldn’thaverainedlastnight.)1.Itmusthaverainedlastnight.fortheditch(水道,渠道)isfullofwater.2.---Canithavebeenacomfortablejourney?3.Tenpassangerswereinacar!Itcan’thavebeenacomfortablejurnery.4.HemayhavegonetoBeijingyesterday.(可能性大)5HemighthavegonetoBeijingyesterday.(可能性小)6.Therewasplentyoftime.Sheneedn’thavehurried.7Youshouldhavecometothemeeting.1.---HemustbeMr.Li.(肯定是)---No,hecan’tbeMr.Li.Mr.LihasgonetoBritain.(不可能是)2.Wemaybelateforclass.It’salreadyseventofive.(也许)3.Youmustn’tplaywithfire!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,isn’tshe?2.ShemusthavegonetoShanghai,hasn’tshe?3.ShemusthavegonetoShanghaiyesterday,didn’tshe?特殊疑问句疑问词+doyouThinksuggestbelieveimaginesupposesay+主语+谓语(插入语)