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Ifyougothere,Iwillgowithyou.Ifyouwentthere,Iwouldshowyoumynewshirt.时态从句(无人称和数的变化)主句现在时1)过去时(were)2)行为动词的过去时should+动词原形would+动词原形could+动词原形might+动词原形1.和现在的事实相反一、非真实条件句中的虚拟语气时态从句主句过去时had+过去分词should+have+过去分词would+have+过去分词could+have+过去分词might+have+过去分词2.和过去的事实相反时态从句主句将来时should+动词原形would+动词原形could+动词原形might+动词原形3.和将来的事实相反1)wereto+动词原形2)should+动词原形3）did/were二、宾语从句中的虚拟语气1.wish后面宾语从句中的虚拟语气，表示与事实相反的愿望。其表达形式一般是将谓语动词提前一个时态。例如:1)与现在事实相反:2)与过去事实相反:3)与将来事实相反:wish+(that)+did(were)IwishIwereashealthyasyou.IwishthatIhadaplane.wish+(that)+haddoneIwishIhadbeentotheconcertlastnight.Iwishyouhadwrittentohim.wish+would/could/might+doIwishhewouldforgiveme.考题点击：1.IwishI____youyesterday.It’sapitythatIdidn’tattendthelecturetogetherwithyou.A.seenB.didseeC.hadseenD.weretosee2.Iwenttobedearlylastnight,butIwishI__so.A.didn’tdoB.hadn’tdoneC.haven’tdoneD.couldn’tdo3.HowIwisheveryfamily____alargehousewithabeautifulgarden.A.hasB.hadC.willhadD.hadhadCBB2.在动词suggest,advise，order,demand,request,desire,insist,require,decide,determine,ask,decide,propose,prefer,后的宾语从句中需用should+动词原形的虚拟语气。“should”可以省略。Heorderedthatthestudents(should)washtheclotheseveryweekbythemselves.考题点击：1.Theteacherdemandedthatthework_____before4o’clock.A.finishedB.befinishedC.shouldfinishD.finish2.---Whatdidthedoctorsayaboutyourmother’sillness?---Hesuggestedthatshe_____anoperationatonce.A.musthaveB.hadC.haveD.hadhad3.Theteacherorderedthatstudents_______.A.mustn’tsmokeB.notsmokeC.smokedD.hadsmokedBCB三、主语从句中的虚拟语气基本句型：1.Itbe+形容词+that…+should+动词原形+…形容词:important,necessary,natural,right,wrong,better,proper,funny,strange,surprising…Itisnecessarythatwe(should)haveawalknow.It'simportantthatwe(should)takegoodcareofthepatient.2.Itbe+过去分词+that…+should+动词原形+…过去分词：suggested,requested,ordered,proposed…Itisrequiredthatnobody(should)smokehere.It’ssuggestedthateverybody(should)buyadictionary.3.Itbe+名词（apity/ashame/nowonder）that…+should+动词原形+…考题点击：1.Isitnecessarythathe_____theexamination?A.takesB.hastotakeC.musttakeD.take2.Itisstrangethathe_____youthis.A.wouldtellB.shouldtellC.hadtoldD.hastoldDB四、表语从句、同位语从句中的虚拟语气在suggestion,proposal,idea,plan,order,advice,decision等名词后面的表语从句、同位语从句中要用虚拟语气，即（should）+动词原形。Mysuggestionisthatwe(should)leaveatonce.1)表语从句:2)同位语从句:Imakeaproposalthatwe(should)holdameetingnextweek.考题点击：1.Hissuggestionthatyou_____oncemoresoundsreasonable.A.tryB.triesC.musttryD.cantry2.Hegaveanadvicethatthey____eachother.A.helpedB.musthelpC.helpD.hadhelpedAC用在由asif,asthough引导的从句中，表示和现在事实相反或对现在的怀疑，用过去时；表示过去想象中的动作或情况，用过去完成时。Itseemsasifthemanwerehisbrother.考题点击：Wefeltasifwe_____eachotherforyears.A.knewB.wereknowingC.hadknownD.haveknowingC用在lest,forfearthat和incase（以防）引导的状语从句中，这时谓语动词用should+动词原形或动词原形。Sheclosedthewindowslestshecatchcold.考题点击：Hetookawaytheoxygentankforfearthatit______explode.A.mayexploreB.explodedC.explodeD.hadexplodeC五。状语从句中的虚拟六、几种特殊的虚拟语气1)倒装虚拟句1.Wereit(=Ifitwere)notfortheirhelp,wecouldn’thavegotoverthedifficulties.2.HadI(=IfIhad)knownaboutit,Iwouldhavetoldyou.3.Shouldanyone(=Ifanyoneshould)call,pleasetakeamessage.Whatwouldhavehappened,_____asfarastheriverbank?(01上海)A.BobhadwalkedfartherB.ifBobshouldwalkfartherC.hadBobwalkedfartherD.ifBobwalkedfartherC考题点击：Ifyou_____himyesterday,you_____whattodonow.A.asked…wouldknowB.hadasked…wouldhaveknownC.askedhim…knowD.hadasked…wouldknowDIfyouhadn’tboughttheticketlastweek,howwouldyougonow?考题点击：2)错综条件句3)介词短语表条件Butforyourhelp,wecouldn’thavesucceeded.Nothingcouldlivewithoutthesun.考题点击：Withoutyourhelp,we____suchrapidprogress.A.couldn’tmakeB.wouldn’tmakeC.willnothavemadeD.wouldn’thavemadeD4)情境中提供虚拟语气Supposetherewerenogravitationalforce,objectswouldnotfalltothegroundwhendropped.Shewasn’tfeelingverywell.Otherwiseshewouldn’thaveleftthemeetingsoearly.高考题点击：Iwentbyplane;otherwiseI____muchlongertime.A.couldtakeB.wouldtakeC.willhavetakenD.wouldhavetakenD5)比较ifonly与onlyifonlyif表示“只有”；Iwakeuponlyifthealarmclockrings.ifonly则表示“如果……就好了”。其从句中的谓语动词用过去时或过去完成时。IfonlyIknewmore.Ifonlythealarmclockhadrung.Ifonlygrandmother____thistogetherwithusnow.A.hadseenB.couldseeC.mustseeD.shouldseeB考题点击：6)It’s(high/low)time从句：Itis(high)timethat后面的从句谓语动词要用过去式或用should加动词原形，但should不可省略。Itistimethatthechildrenwenttobed.Itishightimethatthechildrenshouldgotobed.类似的结构为wouldrather从句：Iwouldratheryouattendedthemeetingthisafternoon.考题点击：Itistimethatyou_________thewholebook.A.mustgooverB.cangooverC.wentoverD.havegoneoverC1)IfIwereabird,Icouldflyinthesky.2)如果你姐姐更努力地尝试，她就能成功Ifyoursistertriedharder,shewouldsucceed.1)Youwouldn’thavecaughtacoldifyouhadputonmoreclothes.2)如果我们早点儿开始，我们就可以到那儿。Ifwehadstartedearlier,wewouldhavegotthere.1)IfIweretoseeTom,whatwouldyoutellhim?2)如果我将做它的话，我会做的更好。IfIshoulddoit,Iwoulddoitbetter.一种可以通过理化反应引起体积膨胀的材料，其体积膨胀可被应用于材料生产、无声爆破等多个领域。用途：较为常见的有混凝土膨胀剂、耐火材料膨胀剂，主要用于补偿材料硬化过程中的收缩，防止开裂。近年根据材料特性，也开发出静态爆破剂，主要通过材料带来的体积膨胀对结构造成破坏膨胀剂膨胀剂膨胀剂材料主要应用于材料生产中，较为常见的是混凝土膨胀剂与耐火材料膨胀剂。混凝土与不定形耐火材料硬化过程中，常因为原材料本身的收缩特性造成开裂。引用膨胀剂是为了引入定量的体积膨胀，补偿材料本身的收缩值，防止材料出现收缩开裂，影响其结构、功能与外观。近年来，随着复合材料广泛研发使用，膨胀类材料也得到各个行业重视，广泛应用于材料的生产制造。年咱们府里壹直忙着大婚的事情，姐妹们都没有出过门，要不要搬到园子里住两天？”“噢，爷是忙糊涂咯，那就依福晋的意