资源描述：
《虚拟语气课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、虚拟语气表示动作或状态不是客观存在的事实，而是说话人的主观愿望，假设或推测等。1用于条件从句用于主语从句用于宾语从句用于状语从句用于定语从句用于简单句虚拟语气的用法wish,suggest,orderItis/was+形容词＋that…If…asif,asthough用于条件从句动词形式时间从句主句与现在事实相反动词过去式（be的过去式一般用were）wouldshould+动词原形couldmight与过去事实相反had+过去分词wouldshouldhave+过去分词couldmight与将来事实可能相反动词过去式/s
2、hould+动词原形wereto＋动词原形wouldshould+动词原形couldmight基本用法Ifplaces____alike,therewouldbelittleneedforgeographers.A.beingB.areC.beD.wereIfwe_________(know)thatthebookswereavailable,wewouldhaveboughtthemyesterday.hadknown有时可以把含有助动词，情态动词，be或have的虚拟条件句省去，而将had,should,were等词提
3、到主语之前，即倒装。*IfIwereyou,Iwouldgowithhim.=WereIyou,Iwouldgowithhim.*IfIhadknownthenews,Iwouldhavetoldyouaboutthat.=HadIknownthenews,Iwouldhavetoldyouaboutthat.倒装用法Hadheworkedharder,he______thefinalexaminations.A.musthavegotthroughB.wouldhavegotthroughC.wouldgetthroug
4、hD.couldgetthrough_____tomorrowmorning,shewouldreachBeijingbythisSunday.A.WouldsheleaveB.ifshewillleaveC.HadsheleftD.Wereshetoleave主从句的动作发生时间不一致的情况。有时条件从句中的动作和主句中的动作发生的时间不一致，这时动词的形式要根据它所表示的时间加以调整。eg.Ifyouhadlistenedtothedoctor,youwouldbeallrightnow.Ifyouhadpractic
5、edspeakingEnglishmore,youwouldbeabletospeakitfluently.(从句动作指过去，主句动作指现在）Icouldhavecalledyouyesterday,butI______youtelephonenumber.A.didn’thaveB.won’thaveC.hadn’thaveD.wouldn’thavePeter______thedriver’stest,buthewasn’tcalmenoughinthelasttenminutes.A.mighthavepassedB
6、.musthavepassedC.willpassedD.oughttohavepassed“Itisimportant（strange/natural/necessary/vital/urgent/imperative/natural/essential/desirable/）that…(should)+V.原形”，表示某事“重要”，“奇怪”，“自然”，“必要”等意义。e.g.Itisimportantthateverymember(should)informhimselfoftheserules.Itisnecessa
7、rythathe(should)besentthereatonce.Itisdecided(hasbeendecided)thatthemeeting(should)bepostponedtilltomorrow.用于主语从句中Itisnecessarythathe____________(take)agoodrestafterworkingforalongtime.Itwasridiculousthathe________thatwayyesterday.A.behavedB.shouldbehaveC.shallbeh
8、aveD.wouldbehave(should)take用于宾语从句Iwish从句结构Example与现在事实相反一般过去式Iwishitwereautumnnow.与过去事实相反过去完成式Hewishes(wished)hehadnotlostthechance.与将来事实相反would+V.原形Iw
