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1、虚拟语气一、虚拟语气在条件句中的用法表示现在或将来情况的虚拟条件句表示过去情况的虚拟条件句错综时间条件句含蓄条件句1、表示现在或将来情况的虚拟条件句动词形式为：条件从句表示一个假想的与事实相反的情况，或不太可能发生的情况Ifwehadenoughmoney,wewouldbuyacomputer.(Butwehaven’t.)Ifshestayedanotherday,hewoulddriveherhome.(Butshewantstogohomenow.)条件从句的谓语主句谓语相当于过去时的形式would+动词原形在条件从句中，如果谓语动词是be，一般要用were，特别是在较正式的文体中
2、：Ifsheweretryingharder,herparentswouldn’tbesoanxious.IfIwereyou,Iwouldtakethatjob.但口语中，在第一、三人称后，也可使用was：IfIwasrich,Iwouldbuyyouanythingyouwanted.但在第一人称后，还是用were好，尤其是在ifIwereyou(inyourposition)中：IfIwereyou,Iwouldn’tbuythatcar.需要注意的特殊情况主句中有时可用could,might,should或oughtto构成谓语：Ifhewerehere,hecouldhelpus
3、.Ifhefailedheoughttotryagain.从句中可用would表示“意愿”IfAnnwouldadmitthisIshouldn’tquarrelwithher.从句中可用wereto或wasto构成谓语，表示将来万一发生的情况：Ifyouweretospeaktohim,itwouldcarrymoreweight.从句中可用should构成谓语，这时主句可用虚拟语气，也可用陈述语气：Ifitshouldbenecessary,Icouldcomeatsix.Ifshewouldbeinterested,I’llphoneher.if可能被省略，这时从句要用倒装语序：We
4、resheincharge,shewoulddothingsdifferently.(=Ifshewereincharge)Shouldyouchangeyourmind,noonewouldblameyou.(=Ifyouchangedyourmind)从句可用“Ifitwerenotfor…”这种句型，表示“若不是……”Ifitweren’tforyourhelp,Iwouldstillbehomeless.Wereitnotforyourhelp,Iwouldn’tbedoingsowell.一些特殊的不完整的条件句：Supposehewerelost.Imagineyourchil
5、dplayedtruant.2、表示过去情况的虚拟条件句动词形式为：表示与事实完全相反的过去情况Ifanythinghadhappened,hewouldhaveletherknow.(Actuallynothinghappened.)IfIhadbeenJane,Iwouldn’thaveansweredthatquestion.条件从句的谓语主句谓语相当于过去时的形式would+动词原形需要注意的地方主句中可用could、might或should构成谓语：Ifshehadbeenhere,shecouldhavemetmysister.IfIhadgottenupearlierthis
6、morning,Imightnothavebeenlate.Ifhehadapologized,youshouldhavedonesotoo.省略if时，从句要改为倒装结构：IfIhadknownyouraddress,Iwouldhavewrittentoyoubefore.HadIknownyouraddress,Iwouldhavewrittentoyoubefore.从句中可用Ifithadnotbeenfor表示“要不是有”：Ifithadn’tbeenfortherain,wewouldhavehadagoodharvest.Haditnotbeenforthedoctor’s
7、care,Iwouldn’thaverecoveredsosoon.3、错综时间条件句条件句中的动词形式多是一般情况，但也有例外情况：IfIhadnotgotmarried,Iwouldstillhavebeenlivingabroad.Ifithadbeenrainingthismorning,wewouldhavestayedhome.有时主句谓语和从句谓语表示的动作发生的时间不同：Ifyouhadlistenedt
