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? if i were a 为什么if i were a boy?应该是 i was为什么是were if i were a boy 为什么‘I’后面跟‘were’? If i were a boy 为什么用were啊 为什么 if i were a boy 中的were 不用was? If I were a boy中,为什么要用were? if i were a if i were a if.i.were.a. 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? 虚拟语态if i were rich,i would buy a downtown house.为什么用were 英语翻译if i were a bird这个为什么用were呢,帮我讲一下, he treats me as if I were a stranger.为什么用were 而不是am if i were a boy again为什么用were而不用was If I were a boy中,为什么要用were不用was? if I were a boy为什么要用were不用was?求解 为什么碧昂丝的if i were a boy中的Be动词是were? 为什么If only I were abird.中的were不用was