虚拟条件句的从句部分如果含有were,should,或had,可将if省略，再把were,should或had移到从句句首，实行倒装。
Weretheyherenow,theycouldhelpus.
=Iftheywereherenow,theycouldhelpus.
Hadyoucomeearlier,youwouldhavemethim
=Ifyouhadcomeearlier,youwouldhavemethim.
Shoulditr ain,thecropswouldbesaved.
=Wereittorain,thecropswouldbesaved.注意：
在虚拟语气的从句中，动词'be'的过去时态一律用"were"，不用was，即在从句中be用were代替。
IfIwereyou,Iwouldgotolookforhim.
如果我是你，就会去找他。
Ifhewerehere,everythingwouldbeallright.
如果他在这儿，一切都会好的。
典型例题
_____todothework,Ishoulddoitsomeotherday.
A.IfwereI B.Iwere C.WereI D.WasI
答案C.在虚拟条件状语中如果有were,should,had这三个词，通常将if省略，主语提前,变成were,should,had+主语的形式。但要注意，在虚拟条件状语从句中，省略连词的倒装形式的句首不能用动词的缩略形式。如我们可说WereInottodo.,而不能说Weren'tItodo.
