If only I were an Englishman是什么意思?为什么要用were?

If only I were an Englishman是什么意思?为什么要用were? if only i were made of 为什么If only I were abird.中的were不用was If only i were you!if only 这句中的Only又是什么意思呀? if only you were if only you were if only it were 为什么是if only I were you 而不是if only i was you If only i were as clever as you! If only it were that If only ,I If I were you If i were U. if i were a If i were if i were a if.i.were.a. if i were you.i'd send him an e-mail应答情景问答if i were you.i'd send him an e-mail怎么回答