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1、虚拟语气时态前移法：1..以下表格是虚拟语气用于条件状语从句中时，主句和从句谓语动词的形式：条件状语从句主句与过去事实相反had+过去分词should/would/could/might+have+过去分词与现在事实相反一般过去时(be用were)would/should/could/might+动词原形与将来事实相反一般过去时或should(wereto)+动词原形Would/should/cold/might+动词原形IfIwereaboy,Iwouldjointhearmy.Ifhehadtakenmyadvice,
2、hewouldhavesucceededinthecompetition.Ifitweretoraintomorrow,thefootballmatchwouldbeputoff.（1）有时侯在使用时可省略if,句子则可换成下列形式，即“were/had/should+主语”。如：WereIaboy,Iwouldjointhearmy.Hadhetakenmyadvice,hewouldhavesucceeded.Wereitnotfortheexpense,IwouldgotoBritain.（2）有时虚拟条件不用从句，
3、而用介词without，butfor等或上下文暗示，如：Iambusynow。Otherwise，Iwouldhelpyou。Withoutair，wecouldn’tlive。（3）当条件状语从句表示的行为和主句表示的行为所发生的时间不一致时，动词的形式要根据它所表示的时间作相应调整。如：Iftheyhadworkedhard,theywouldbeverytired.(从句说的是过去，主句指的是现在)IfIwereyou,Iwouldhavegonewithhim.(从句说的是现在，主句指的是过去)2.“wish+宾语
4、从句”表示不能实现的愿望。如：Iwishitwerespringalltheyearround.IwishIhadknowntheanswer.IwishIcouldflylikeabird.（would/might/could）3.虚拟语气在asif/asthough、evenif/eventhough等引导的状语从句中，如果从句表示的动作发生在过去，用过去完成时；指现在状况，则用一般过去时；指将来状况则用过去将来时。如：Hediditasifhewereanexpert.Evenifshewerehere,shecou
5、ldnotsolvetheproblem.4.虚拟语气用在ifonly引导的感叹句中。如：IfonlyIwereabird.IfonlyIhadtakenhisadvice.5.wouldratherthat…didwouldratherthat…haddoneIwouldratheryoulivedinschoolnow.Iwouldratheryouhadgonethereyesterday.Should类的虚拟语气1.在表示建议、要求、命令等的动词suggest、advise、propose、demand、requi
6、re、insist5request、command、order等后的宾语从句中，谓语动词用should+动词原形或是动词原形。如：Shesuggestedwe(should)leavehereatonce.Thedoctororderedsheshouldbeoperated.2.作表示建议、要求、命令等的名词advise、idea、order、demand、plan、proposal、suggestion、request等的表语从句和同位语从句，从句中的谓语动词用“（should）+动词原形”。如：Hissuggesti
7、onthatwe(should)gotoShanghaiiswonderful.Myideaisthatthey(should)pay100dollars.3.在主语从句中，谓语动词的虚拟语气用“should+动词原形”的结构，表示惊奇、不相信、理应如此等。如：Itisnecessary(important,natural,strange,etc.)thatweshouldcleantheroomeveryday.Itwasapity(ashame,nowonder,etc.)thatyoushouldbesocarele
8、ss.Itwillbedesired(suggested,decided,ordered,requested,proposed,etc.)thatsheshouldfinishherhomeworkthisafternoon.4.“Itis(high)time(that)…”中从句的谓语动词用一般过去时
