虚拟语气句型1.
If+were/did(动词的过去式)，主语+would/might/should/could+do表示对现在的假设
IfIwereyou，Iwouldnotbesoproud.
Idon’thaveacellphone.IfIhadone，itwouldbeconvenientformetogetintouchwithothers.
IfIwereinyourposition，Iwouldthinkbetterofit.
虚拟语气句型2.
If+haddone，主语+would/might/should/could+havedone
表示对过去或已发生事情的虚拟假设
Whatapityitisthatyoudidn’tattendtheconcertyesterday！Ifyouhadattendtheconcert，youwouldhaveseenthefamoussinger.
Anyoneinhispositionwouldhavedonethesame.=
=IfanyonehadbeenIhisposition，hewouldhavedonethesame.
虚拟语气句型3
If+were/did/(动词过去式)/should/weretodo，主语=would/might/should/could+do
(表示对将来的假设)
Ifweweretopanic，wewouldnotbeabletogiveproperfirstaid.
Ifitweretorain(=shouldrain=rained)tomorrow，wewouldnotgoforapicnic.
Ifyoushouldn’tpassthecollegeentranceexamination，whatwouldyoudo？
虚拟语气条件句的倒装：在虚拟条件句中，如出现有were，had，shoud，可省略if，可将主语于这些词倒装，构成虚拟倒装句.
Shouldheactlikethatagain，hewouldbefined.
HadIknownmoreaboutgivingfirstaid，Icouldhavehelpedthem.
WereItogotothemoononeday，Iwouldseeitwithmyowneyes.
HadIenoughmoney(=ifIhadenoughmoney)，Iwouldbuyalargehouse.
虚拟语气句型4
Ifonly引起的感叹句，相当于howIwish+宾语从句，意为“但愿….，要是…就好了”
Ifonlyhecouldcome！
Ifonlywestudentsdidn’thavesomuchhomework！
IfonlyIhadn’tbeensocarelessintheexam！
虚拟语气句型5.
Ifitwerenotfor…(=wereitnotfor….)
Ifithadn’tbeenfor…(=haditnotbeenfor…)
要不是因为有…..；如果不是……
Ifithadn’tbeenfor(haditnotbeenfor)thedeterminedcaptain，allthepassengersonboardwouldn’thavebeensaved.
Ifitwerenotforyourrichparents，youcouldn’tlivesoeasyalife.
虚拟语气句型6butfor，butthat
Butfor+名词和butthat+从句，意为”倘若不是，要不是”，接虚拟语气.
ButfortheCommunistPartyofChina，thePeople’sRepublicofChinacouldn’thavebeenfounded.
Butforairandwater，nothingcouldsurvive.
Shecouldn’thavebelievedit，butthatshesawit.
