为什么要说If I were a fairy,而不用If I am a fairy?

为什么要说If I were a fairy,而不用If I am a fairy? was不是is和am的过去式吗?were不是are的过去式吗?为什么可以用if i were a boy?而不用if i 为什么 if i were a boy 中的were 不用was? 英语翻译If our love was a fairy tale I would charge in and rescu 连词成句 am,I ,dream ,in fairy,a ,my If I were a boy与If I am a boy.的的区别,为什么I 后面可以用were? I am i__in fairy stories. if i were a I think she can be a fairy 为什么If you were me、"me"用宾格而不用:I" 为什么是If I "were" a bird? If I were a boy中,为什么要用were不用was?