"if I were a boy"是虚拟语气，表示说话人的意图是对某一个情况，进行一种不真实的假设.但是，在美语里，虚拟语气，如果主语是第一人称单数或第三人称单数的话，可以用was,也用"if I was a boy". 只有"If I were you,"是例外，不说"If I was you"
