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1.英语动词有三种语气，陈述语气，祈使语气和虚拟语气。2.定义：用来表示说的话不是事实，或者是不可能发生的情况，而是一种愿望，建议，假设的语气叫虚拟语气。一：虚拟语气在条件状语从句中的用法。条件从句If从句的谓语形式主句的谓语形式现在过去未来过去时（were）过去完成时Would/could/should/might+V.（原）Would/could/should/might+have+p.p.1.过去时2.should+V.3.weretodowould/could/should/might+V.（原）1.IfIhadHIV,IwouldknowbecauseIwouldfeelsick.2.IfIwereyou,IwouldgiveAIDSpatientahug.3.IfIhadtakenyouradvice,Iwouldn’thavemadeamistake.4.Ifhehadbeenthere,itwouldn’thavehappened.与现在事实相反与过去事实相反5.Ifitshouldraintomorrow,theywouldn’tgoforanouting.6.Ithinkwecoulddoit,ifweplaneditproperlyandcouldborrowthetools.7.Ifweweretohavethreedaysoff,wewouldenjoyaveryhappylife.与将来事实相反二：虚拟语气特殊句型：1.Wish的宾语从句现在：过去：未来：过去时（were）过去完成时would/could/might+V.should1.IwishIwereabird.（现在）2.IwishIhadn’tmadesuchamistake.（过去）3.Wewishourparentswouldn’tpunishus.（将来）2.Wouldratherthat现在：过去：未来：Iwouldratheryoupaidmenow.Iwouldratheryouhadgone,too.Don’tcome.Iwouldratheryoucametomorrow.过去时过去时过去完成时3.asif/though+Clause现在：过去：过去时过去完成时Helooksasifheweredrunk.Theytalkedasiftheyhadbeenfriendsforyears.Shelovesthebabyasifitwereherownson.Itseemsthatitwerespring.Irememberthewholethingasifithadhappenedyesterday.4.It’s(about/high)time+that---should+V.过去时你该走了。我们该去睡觉了。It’shightimethatyouwent.It’shightimethatyouweregoing.It’shightimethatyoushouldgo.It’stimethatwewenttobed.It’stimethatweshouldgotobed.5.表示要求，命令，建议的虚拟语气。1.宾语从句。常见动词：一个坚持，两个命令，三个建议，四个要求。即1.insist2.order,command3.advise,suggest,propose4.demand,require,request,desire除此还有promise,persuade,decide,instruct,object,determine,prefer,pray,persist,recommend…这些动词后面的宾语从句要使用虚拟语气用法。即从句中的动词使用should+动词原形，或者将should省略。我们建议Tom去休息一下。他坚决要求我到场。国王命令囚犯明天要实施死刑。他们要求我们派他们去那儿工作。WesuggestedthatTomhavearest.HeinsistedthatI(should)bepresent.Thekingorderedthattheprisonersbekilledthenextday.Theyrequestedthatwe(should)sendthemtoworkthere.以上动词相应的名词构成的名词性从句包括主语从句，表语从句和同位语也要使用虚拟语气。从句中的动词形式一样。order,advice,suggestion,proposal,demand,request,desire,decision,instruction,objection,advice,appointment….It’ssuggestedthattheplanbecarriedout.Mydemandisthatsheshouldcometoseemeonceaweek.Allofusarefortheadvicethatthechemicalfactoryshouldbecloseddown.6.without和butfor构成虚拟。butfor要不是Withoutsunlight,people’slifewouldbedifferentfromtoday.Butforyourhelp,Iwouldn’thavefinishedthework.Withoutyourhelp,Iwouldhavefailed.Butforwater,itwouldbeimpossibletoliveinthedesert.7.Ifonly…要是就好了IfonlyIknewhisname!Ifonlywehadfollowedyouradvice!IfonlyIcouldseehimagain!要是我们的父母能和我们住在一起就好了。要是我没错过火车就好了！Ifonlyourparentscouldlivewithus!IfonlyIhadn’tmissedthetrain!8.It’snecessary/strange/natural/important+that---Clause从句中的动词要用虚拟，即（should）+动词原形Itisimportantthatwe(should)masteraforeignlanguage.Itisstrangethatsherefusetocometotheparty.It’snecessarythatweshouldstudyhard.9.某些简单句的固定句型：Heavenhelphim!Godblessyou!Mayyousucceed!LonglivethePeople’sRepublicofChina!三：虚拟语气假设条件句型注意点：1.假设条件从句谓语动词发生的时间与主句所假设的谓语动词不一致，叫做错综条件虚拟语气。主句和从句的谓语动词要依照假设的时间而顶。Iftheweatherhadbeenfiner,thecropswouldbegrowingstillbetter.Ifyouhadfollowedtheteacher’sadvice,youwouldn’tbeinthehospital.2.假设条件虚拟倒装。条件从句中有should，were，had三个助动词可以把if省略，并将这三个词提至句首。IfIwereyou,Iwouldgiveitup.WereIyou,Iwouldgiveitup.Ifitwerenotforyouradvice,wecouldn’thavegotoverthedifficulties.Wereitnotforyouradvice,wecouldn’thavegotoverthedifficulties.IfIhadhadtime,Iwouldhaverunroundthatlakeagain.HadIhadtime,Iwouldhaverunroundthatlakeagain.Ifthereshouldbeaflood,whatshouldwedo?Shouldtherebeaflood,whatshouldwedo?