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教学目标：1.学习虚拟语气在if条件句中的用法2.掌握虚拟语气的6种特殊情况教学重点：掌握虚拟语气在if条件句中的用法英语中的语气分为_________，_______和_________三类。陈述语气祈使语气虚拟语气Step1Presentation1.Chinaisafast-developingcountry.（）2.Makeyourselffree.（）3.IfIwereabird,Icouldflyintheair.（）陈述语气祈使语气虚拟语气一、虚拟语气(theSubjunctiveMood)一、概念表示说话人所说的不是事实，而是一种假设、愿望或推测，它主要用于if条件状语从句,也可用于其它从句。1.对过去情况的虚拟从句谓语：主句谓语：had+动词的过去分词would,should,could,might+have+动词的过去分词练习：1.Ifwe________(have)enoughrainlastyear,we__________________(gain)agoodharvest.hadhadcouldhavegained练习：2.Ifyou____________(work)hard,you_______________(pass)thefinaltestlasttime.hadworkedwouldhavepassed2.对现在情况的虚拟从句谓语：主句谓语：过去时would,should,could,might+动词原形注意：在虚拟语气中，只能用were，不能用was.练习：1.IfI_____(be)tenyearsyounger,I___________(start)alloveragain.wouldstartwere练习：2.IfI________(have)enoughmoney,I_________(buy)myselfaDELLcomputer.hadwouldbuy3.对将来情况的虚拟从句谓语：主句谓语：3）过去时would,should,could,might+动词原形1）should+动词原形2）wereto+动词原形练习：IfI___________________(see)himtomorrow,I_____________(invite)himhome.shouldsee/weretosee/sawwouldinvite练习：2.Ifit_____________________(be)finetomorrow,I________(go)onatrip.wouldgoshouldbe/were/weretobe1.含蓄条件句有时虚拟语气的条件从句不用if引导，而用butfor,without,ifonly,otherwise等词，主句的谓语动词和if相同。二.虚拟语气的六种特殊情况eg.Withoutyourhelp,Icouldn’thaveachievedallthis.练习Butforwater,we________(be)impossibletoliveinthedesert.wouldbe2.错综时间条件句在错综条件句中，if从句谓语动词发生的时间与主句所假设的谓语动词不一致。主句和从句的谓语动词要依照对应的时间而定。eg.Ifyouhadlistenedtomeyesterday,youwouldn’tbeinsuchtroublenow.练习Ifhe___________(receive)sixmorevoteslastyear,he_________(be)ourchairmannow.hadreceivedwouldbe3.在表示命令、建议、要求等动词后面的宾语从句中，用虚拟语气，其谓语动词用(should)+动词原形一坚持（insist）二命令（order，command）三建议（advise，suggest，propose）、四要求（demand，require，request，desire）记住：insist/suggest各有两种意思，要用不同的语气1).insist表示“坚决要求”时，用虚拟语气，即should+do;表示“坚称，坚持说”时，用陈述语气，表示事实，时态依具体情况而定。◆Sheinsistedthatshe_____(be)right.◆Iinsistedthatwe__________thistoher坚持说坚持要求was(should)tell2）suggest表示“建议”时，用虚拟语气。表示“表明、暗示”时，用陈述语气。◆Thelookonhisfacesuggestedthathe____(be)unhappy.◆Theteachersuggestedthatwe___________(clean)theblackboardafterclass.表明建议was(should)clean4、用在Itis(high)timethat句型中。Itis(high)timethat+过去式或should+动词原形(should不可省略)。Itis（high）timethatthechildren______________（go）tobed.shouldgo/went5.条件状语的倒装如果从句中有were,had,should时,可以倒装成：Were/Had/Should+主+其他（if省略）__________,IwouldgiveAIDSpatientahug.IfIwereyou,IwouldgiveAIDSpatientahug.WereIyou____________________________________,hewouldhaveseenthefilm.Ifhehadbeenthereyesterday,hewouldhaveseenthefilm.Hadhebeenthereyesterday______________________________,wewouldn’tgoout.Ifitshouldsnowtomorrow,wewouldn’tgoout.Shoulditsnowtomorrow6.虚拟语气在其它结构中的应用（1）wish+宾语从句（2）由asif或asthough引导的状语从句（3）Ifonly若是...那该多好啊对现在情况的虚拟，从句用过去时（did/were）。对将来情况的虚拟，从句用would,could,might+动词原形。对过去情况的虚拟，从句用过去完成时。1)IwishI__________(go)abroadnextyear.2）Heappearsasthoughhe____(be)anItalian.3)IwishI_________(see)thefootballmatchyesterday.couldgowerehadseen4)IfonlyI___________（arrive）intime!5)Ifonlyshe__________(come)tomorrow.hadarrivedcouldcomeStep2Practice1.Therice______ifyouhadbeenmorecareful.A.wouldnotbeburningB.wouldnotburnC.wouldnothaveburntD.wouldnotburnt2.Iftheflowerhadbeenwatered,it______now.A.wouldn’tdieB.isdeadC.hadbeendeadD.willnotdie6.从句中有should，were，had三个助动词时，If可能被省略,从句要倒装1.Weresheincharge(=Ifshewereincharge),shewoulddothingsdifferently.2.HadIknownyouraddress(=IfIhadknownyouraddress),Iwouldhavewrittenbefore.3.Shouldyouchangeyourmind(=Ifyoushouldchangeyourmind),noonewouldblameyou.3.Ididn’tseeyoursisteratthemeeting.Ifshe______shewouldhavemetmybrother.A.hascomeB.didcomeC.cameD.hadcome4.______forthefreetickets,Iwouldnothavegonetothefilmssooften.A.IfitisnotB.WereitnotC.HaditnotbeenD.Iftheyhavenot6.从句中有should，were，had三个助动词时，If可能被省略,从句要倒装1.Weresheincharge(=Ifshewereincharge),shewoulddothingsdifferently.2.HadIknownyouraddress(=IfIhadknownyouraddress),Iwouldhavewrittenbefore.3.Shouldyouchangeyourmind(=Ifyoushouldchangeyourmind),noonewouldblameyou.5.Theguardthereinsistedthateverybody______therules.A.obeysB.obeyC.willobeyD.wouldobey6.Itishightimeyou______thebus.A.hadcaughtB.caughtC.willcatchD.catch7.Withoutelectricity,humanlife______quitedifferenttoday.A.isB.willbeC.wouldhavebeenD.wouldbe8.Ifit______tomorrow,theywouldnotgotherebybike.A.willrainB.rainsC.wouldrainD.shouldrain9.______itraintomorrow,wewouldhavetoputoffthevisittotheYangpuBridge.A.WereB.ShouldC.WouldD.Will10.IfI______you,Iwouldnotdoit.A.amB.wereC.shallbeD.beingStep3Conclusion主从句构成时态虚拟条件从句(if…)主句对现在情况的虚拟对过去情况的虚拟If+主语+did(be用were)主语+would/should/could/might+doIf+主语+haddone主语+would/should/could/might+havedone主从句构成虚拟条件从句(if…)主句对将来情况的虚拟①If+主语+shoulddo②If+主语+weretodo③If+主语+did主语+would/should/could/might+do时态6种特殊用法1.含蓄条件句2.错综时间条件句3.用在表示命令、建议、要求等动词后4.用在Itis(high)timethat句型中。5.条件状语的倒装6.（1）wish+宾语从句（2）由asif或asthough引导的状语从句(3)IfonlyStep4Homework1、背诵if条件句中虚拟语气的三种用法。2、完成课本5页的练习2、3。