问题补充：
虚拟语气中的倒装句只有were,should,had才能去if提前吗?would和could不行吗? 英语
答案：
【答案】 如果虚拟语气的条件从句谓语动词中含有were,had,could,should,有时可将if省去,而将条件从句的主语置于were,had,should,could 之后.
Had you invited us,we would have come to your party.
Were I you,I would do more practice after class.
Could she lend us a helping hand,she would do so.
