省略if的虚拟条件句中，were,had,should与主语倒装
WereIyou,Iwoulddothework
WereI(=IfIwere)inyourplace,Iwouldn’tgiveitupsoearly
HadI(=IfIhad)known,Imighthavejoinedyouinthediscussion
Shouldyou(=Ifyoushould)beinterested,Ihaveabookonthesubjectyoumightliketosee
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，即将were,should,had等词置于句首，这种多用于书面语
如：Shouldheagreetogothere,wewouldsendhimthere
要是他答应去的话，我们就派他去
Wereshehere,shewouldagreewithus
如果她在这儿的话，她会同意我们的
Hadhelearntaboutcomputers,wewouldhavehiredhimtoworkhere
如果她懂一些电脑知识的话，我们已经聘用他来这里工作了
