虚拟语气：虚拟证据表示说的话不是事实，或者不可能发生的情况，而是一种愿望、建议或者与事实相反的假设等，一般常用于正式的书面语中。一、虚拟语气在if条件从句中的用法：1、a.IfIwereyou,Iwouldapplyforthejob.b.IfIlivednearmyoffice,Iwouldwalktotheoffice.与现在事实相反，If条件从句谓语：过去式（be用were）主句谓语：should/would/could/might+动词原形2、a.Ifyouhadbeenmorecareful,Youcouldhavepassedtheexam.b.Ifyouhadturnedoffthegas,thehousewouldn’thavecaughtfire.与过去事实相反，If条件从句谓语：had+动词过去分词主句谓语：should/would/could/might+havedone3、a.Ifitshouldraintomorrow,wewouldnotgocamping.b.ifitweretoraintomorrow,wewouldnotgocamping.c.Ifitrainedtomorrow,wewouldnotgocamping.与将来事实相反：If条件从句谓语：过去式/should+v原形/were+todo主句谓语：should/would/could/might+do二、混合虚拟条件句：不同时间的虚拟，各遵守各的规则，如：a.Ifyouhadfollowedthedoctor’sadvice,youwouldbequiteallrightnow.从句叙述与过去事实相反（had+done），主句叙述与现在事实相反（would+v）b.IfIwereyou,Iwouldhavetakenhisadvice.从句叙述与现在事实相反（过去式），主句叙述与过去事实相反（wouldhavedone）三、虚拟语气在宾语从句中的适用：a.Theydemandedthattheblackpeople(should)betreatedaswellaswhitepeople.b.Hesuggestedthatwe(should)startoffatonce.（建议）Hissmilesuggestedthathewassatisfiedwithourwork.（暗示，表明）c.Iinsistedthatyou(should)givememymoneyback.（坚决（持），要求）Mikeinsistedthathehadneverstolenanything.（坚持说/坚持认为）这类动词有：一坚持（insist），二命令（order,command），三建议（advise,suggest,recommend,propose），四要求（require,request,demand,desire）d.IwishIwereabird.Idowishyouwouldcomeearliernexttime.IwishIhaddonebetterinmywork.四、虚拟语气在主语从句中的适用：1.Itwas/isimportant/vital/necessary/appropriate/proper/rightthat……eg:Itisimportantthatwe(should)thinkbeforewedecide.2.Itisimportantthatwe(should)thinkbeforewedecide.据建议/要求/命令……eg:Itissuggestedthatparents(should)spendmoretimewiththeirchildrenalone.五、虚拟语气在表语从句中的适用（与表示决定、主张、要求、建议、命令的名词。如：suggestion,proposal,advice,order,demand,requirement等）构成的表语从句常用should+do结构eg：Oursuggestionisthatthemeeting(should)beputoff.六、虚拟语气在同位语从句中的适用（与表示决定、主张、要求、建议、命令的名词。如：suggestion,proposal,advice,order,demand,requirement等）构成的同位语从句中常用should+do结构eg:Doctorsgiveussomeadvicethatwe(should)paymoreattentiontoourhealth.七、含蓄条件句的虚拟语气：由butfor（要不是），Without（要是没有），otherwise（要