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虚拟条件句在英语中，语气是动词的一种形式，用来表示说话人的意图或态度。英语的语气有三种：_____语气（表示所说的话是事实），_____语气（表示所说的话是请求或命令）_____语气（表示所说的话只是一种主观的愿望或假设或建议等）。如果所表示的条件是真实的，或者完全有可能实现的，叫真实条件句，主句和从句的谓语都用陈述语气。如果所表示的条件不可能实现或者实现的可能性很小时，叫非真实条件句，主句和从句的谓语要用虚拟语气。（1）含if的虚拟条件句从句主句与现在事实相反与过去事实相反与将来事实相反练习：1.IfI_____(be)you,I__________(tell)themthetruth.如果我是你的话，我就会把真相告诉他们。2.IfI_____(get)theinformation,I__________(let)youknowfirst.如果我知道这个情况的话，我会第一个告诉你。3.Ifwe__________(have)enoughmoney,we_______________(buy)thehouse.如果我们有足够的钱的话，我们就买下那座房子了。4.Ifshe______________(come),what_______________(say)toher?万一她来了，我该怎么对她说呢？5.Ifyoudon’thurry,you__________(be)lateforschool.（2）省略if的虚拟条件句在虚拟条件句中，如果有were，had，或should，就可以省略if，把这些助动词放在句首。练习：改写下面句子，省略句中if1.IfIwereyou,Iwouldtellthemthetruth.2.Ifwehadhadenoughmoney,wewouldhaveboughtthehouse.3.Ifsheshouldcome,whatshouldIsaytoher?能力训练1.IfI_____himyesterday，I_____himaboutit.A.saw;wouldaskB.hadseen;wouldhaveaskedC.hadseen;wouldaskD.saw;wouldhaveasked2.Whatdoyouthinkwouldhappenifthere_____nolightduringthenight?A.isB.willbeC.wereD.wouldbe3.Ifherlawyer_____herelastSunday,he_____herfromgoing.A.hadbeen;wouldhavepreventedB.hadbeen;wouldpreventC.were;wouldpreventD.were;wouldhaveprevented4.Ifithadnotbeenfortheliberation,nochanges_____placeinmyhometown.A.wouldhavetakenB.wouldhavebeentakenC.willtakeD.willbetaken5._____latetomorrow,whowouldtakeherplace?A.ShouldMissGreencomeB.IfMissGreenwouldcomeC.MissGreenshouldcomeD.IfMissGreencomes6．_____it_____,thecrops_____besaved.A.Had;rained;couldB.Should;rain;wouldC.If;rains;shouldD.Would;rain;should7.Ifwe_____yesterday,we_____thework.A.weren’tinterrupted;wouldfinishB.didn’tinterrupt;wouldhavefinishedC.hadn’tinterrupted;hadfinishedD.hadn’tbeeninterrupted;wouldhavefinished8._____,hewouldhavesucceededintheexaminations.A.IfhehasworkedhardB.IfheworkshardC.HadheworkedhardD.Wereheworkedhard9.—CanIstayathometomorrow?—Yes,youcanifit______.A.willsnowB.isgoingtosnowC.snowsD.snowed10．Idon’tknowifhe_____thisafternoon.Butifhe____,Iwilltellyou.A.willcome;willdo;B.comes;willdoC.willcome;doesD.comes;does11.Askhimtoringmeupifyou______him.A.seeB.sawC.wouldseeD.willsee12.Ifpeople_________pollutingtheair,animalsandplantswilldiesoon.A.don’tstopB.didn’tstopC.shallnotstopD.haven’tstopped13.I’llgoshoppingwithyouifyou______wait.A.willB.wouldC.shouldD.aregoingto答案：（1）含if的虚拟条件句从句主句与现在事实相反过去式（be用were）would/should/could/might+do与过去事实相反过去完成式would/should/could/might+havedone与将来事实相反should(wereto)+动词原形would/should/could/might+doIfIwereyou,Iwouldtellthemthetruth.如果我是你的话，我就会把真相告诉他们。IfIgottheinformation,Iwouldletyouknowfirst.如果我知道这个情况的话，我会第一个告诉你。Ifwehadhadenoughmoney,wewouldhaveboughtthehouse.如果我们有足够的钱的话，我们就买下那座房子了。Ifshewereto/shouldcome,whatshouldIsaytoher?万一她来了，我该怎么对她说呢？（2）省略if的虚拟条件句在虚拟条件句中，如果有were，had，或should，就可以省略if，把这些助动词放在句首。WereIyou,Iwouldtellthemthetruth.Hadwehadenoughmoney,wewouldhaveboughtthehouse.Shouldshecome,whatshouldIsaytoher?1-13BCAAABDCCCAAA