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1、非真实条件状语从句表示与过去事实相反的情况从句：If主语+had+done主句：主语+should/would/could/might+havedone1．IfIhadgottenthereearlier,Ishould/couldhavemether.2．Ifhehadtakenmyadvice,hewouldnothavemadesuchamistake.表示与现在事实相反的情况：从句：If主语+过去时(Be动词用were)主句：主语+should/would/could/might+do：注意，在虚拟语气的从句中，动词be的过去
2、时态一律用were，不用was。1．IfIwereyou,Iwouldtakeanumbrella.2．IfIknewhistelephonenumber,Iwouldtellyou.3．Iftherewerenoairorwater,therewouldbenolivingthingsontheearth.4．IfIhadanymoneywithme,Icouldlendyousome.5．Ifhestudiedharder,hemightpasstheexam.6．shelookedatmeasifIhadbeenastrange
3、r.7．IfIwereyou,I'dwearashirtandtie.表示对将来情况的主观推测从句：①if+主语+weretodo②if+主语+should+do③if+主语+did（动词过去式）/were主句：主语+should/would/could/might+do1．Ifheshouldcomeheretomorrow,Iwouldtalktohim.2．IftherewereaheavysnownextSunday,wewouldnotgoskating.3．IfsheweretobeherenextMonday,Iwoul
4、dtellheraboutthematter.错综条件句IfIhadworkedhardatschool,Iwouldbeanengineer,too.Iftheyhadinformedus,wewouldnotcomeherenow.Ifhewerefreetoday,wewouldhavesenthimtoBeijing.Ifheknewher,hewouldhavegreetedher.当虚拟条件句的谓语动词含有were,should,had时，if可以省略，这时条件从句要用倒装语序，即把were,should,had等词置于句
5、首。eg：Shouldheagreetogothere,wewouldsendhimthere.Wereshehere,shewouldagreewithus.Hadhelearntaboutcomputers,wewouldhavehiredhimtoworkhere.含蓄条件句Wedidn’tknowhistelephonenumber;otherwisewewouldhavetelephonedhim.Withoutyourhelp,wewouldn’thaveachievedsomuch.Butforyourhelp,Iwou
6、ldnothavesucceededintheexperiment.Itwouldcausegreattroublenottolubricatethebearingimmediately.省略从句Hewouldhavefinishedit.他本该完成了。Youcouldhavepassedthisexam.你本能通过这次考试的。省略主句IfIwereathomenow.要是我现在在家里该多好啊。IfonlyIhadgotit.要是只有我得到它了该多好啊。让步状语从句的虚拟语气1、在evenif,eventhough所引导的让步状语从句
7、中用may/might+动词原形，may/might可以省略，表示与现在相反的情况；从句用过去完成时，表示与过去相反的情况，类似的词有though/eventhough/whatever/however/solongas;主句、从句的结构与if所引导的条件从句结构相同。Evenifhewereherehimself,heshouldnotknowwhattodo.NobodycouldsavehimeventhoughHuaTuoshouldcomehere.2、在whatever，whichever，whenever，whoever
8、,wherever，however,nomatterwh-等引导的让步状语从句中，从句虚拟语气结构为：指现在或将来：may+do。Wewillfinishitontimenomatterwhatmayhappen.Wew
