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1、1.真实条件句表示的情况有可能发生，用陈述语气。IwillnotgotothepartyifIamnotinvited.2.虚拟条件句表示的情况不可能发生或者发生的可能很小。下面我们重点讲虚拟条件句If引导的条件状语从句时间从句主句与现在事实相反过去式（be一般用were）shouldwouldcould+动词原形might与过去事实相反had+过去分词shouldwouldcould+have+过分might与将来事实相反过去式（be一般用were）should+动词原形wereto+动词原形shouldwouldcould+动词原形might1.
2、与现在事实相反IfIknewhistelephonenumber,Iwouldtellyou.IfIwereyou,Iwouldnotsoproud.2.与过去事实相反1.Ifhehadtakenmyadvice,hewouldnothavemadesuchamistake.2.IfIhadgotthereearlier,Iwouldhavemether.3.与将来的事实相反1.IftherewereaheavysnownextSunday,wewouldnotgoskating.2.Ifsheshouldcome,Iwouldtellherabou
3、tthematter.1.Ifmybrotherwerehere,everythingwouldbeallright. 2.Ifyouhadworkedhard,youwouldhavepassedtheexam. 3.Ifitshouldraintomorrow,wewouldnotgocamping.如果条件从句中有were/had/should时，可以把if省略，把这几个词放到主句之前，构成主谓倒装。WereIyou(=IfIwereyou),Iwouldnotdoit.HadIthetime(=IfIhadthetime),Iwouldg
4、o.Shouldyouchangeyourmind(=Ifyoushouldchangeyourmind),noonewouldblameyou.当条件状语从句表示的行为所发生的时间和主句表示的行为所发生的时间不一致时，被称为“错综时间条件句”，动词的形式要根据它所表示的时间作相应的调整。Ifyouhadfollowedmyadvice,youwouldbebetternow.Ifyouhadnotstudiedtheproblemcarefully,youwouldfinddifficultynow.Theprinterisofgoodqualit
5、y.Ifit_____breakdownwithinthefirstyear,wewouldrepairitatourexpense. A.would B.should C.could D.might2._____,theforestfirewouldhavebeendiscoveredmuchearlier. A.Butfortheircare B.Iftheywerecareful C.Withouttheircare D.Hadtheybeenmorecareful3.Ifthepresentunemployment______continu
6、e,thesocietywouldfaceamoredifficultsituation. A.would B.should C.might D.could4.—Theweatherhasbeenveryhotanddry. —Yes.Ifithadrainedevenadrop,thingswouldbemuchbetternow!Andmyvegetables____. A.wouldn’tdie B.didn’tdie C.hadn’tdied D.wouldn’thavedied5.HadIknownaboutthecomputerprogr
7、am,ahugeamountoftimeandenergy_____. A.wouldhavebeensaved B.hadbeensaved C.willbesaved D.wassaved6.Ifwe____theotherroad,wemighthavearrivedhereintimeforthemeeting. A.take B.hadtaken C.took D.havetaken含蓄虚拟条件句without…（没有…),ifonly（要是…就是好了），butfor(要不是)，otherwise，等等Withoutyourhelp,w
8、ecouldn’thavefinishedtheworkaheadoftime.IfonlyIcouldsp
