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1、Grammar专四常考语法点汇总一、虚拟语气(UnitOne1,14,UnitTwo3,UnitThree1,UnitFour1,12,UnitFive7)1.虚拟条件句1)倒装结构：条件句有were,had,should时，可使用倒装结构。e.g.Wereitnecessary,Iwouldresign.Hadyouinformedmeearlier,Iwouldhavecomeover.Shouldyoumeether,youshouldnotbeabletorecognizeher.2)错
2、综时间条件句e.g.IfImyumbrellawithmethismorning,Iwetnow.A.hadtaken…wouldnothavebeenB.took…shouldnotbeC.weretotake…wouldnotbeD.hadtaken…shouldnotbe3)无条件的虚拟句：butfor,with,without,or,but,otherwise,incaseof,whatif,etc.Butforyourco-operation,wewouldhavefailed.2．I
3、wish…/Ifonly句式：与现在事实相反，用were或动词的一般过去式；与过去事实相反，用had+过去分词；表示将来没有把握或不太可能实现的愿望，用would/could/should/might+动词原形。Iwishhewerewithmenow.Iwishhehadbeenwithmeatthatmoment.Iwishhewouldbewithmethisweekend.3．asif引导的从句（注意区别事实与假设）Someblackcloudsarefloatinginthesky.I
4、tlooksasif.itmightrainitisgoingtorainitwouldberainyitwastorainBushtalkedasifhewerestillconfidentabouttheeconomy.4．在suggest,order,demand,propose,desire等表示建议、命令、态度等词（包括动词和名词）引导的名词从句中用should+动词原形，should可省。但Whenhewasaskedwhyhisfriendhadnotacceptedtheoffe
5、r,hesuggested.thathisfriendshouldbetooproudtoacceptitthathisfriendwastooproudtoacceptitthathisfriendtooproudtoacceptitthathisfriendistooproudtoacceptit5．在important,necessary,urgent,essential,desirable,resolved等形容词及相应的名词后面用should+动词原形，should可省。Heissue
6、dtheordersthattheworkbedoneatonce.WhatIadviseisthathekeepregularhours.6．Itis(high/about)time句式中虚拟语气用过去式。It’stimethatwewentbacktoourworkagain.7．wouldrather，wouldsooner,wouldassoon,justassoon后接动词原形，指现在或将来时间，表示一种主观愿望或选择。e.g.Hewouldsoonerdiethansurrender
7、.接不定式完成式，表示过去的某种选择不恰当。e.g.I’drathernothavetoldherthenews.Sheissuchagossip.接从句，用虚拟语气，一般过去时表示一个现在或将来的愿望，过去完成时表示一个过去的愿望。e.g.I’dratherthatyoupaidthemoneyyourself.Iwouldsoonershepaintedthewallgreennexttime.I’dsoonershehadn’tdonethat.8.在forfearthat,lest,in
8、case引导的目的状语从句中可用虚拟语气。Forfearthat后的从句用should/could/might+动词原形，lest引导的状语从句中用should+动词原形，should可省，incase后的从句可用should+动词原形或陈述语气,should可省。e.g.Ididn’tmakeanoiseforfearthatIshould/mightdisturbher.Ididn’tmakeanoiselestI(should)disturbher.Thegameispostponedin
