虚拟语气中BE动词（无论是何种时态）只能对应were,而再无其它. 如 If i were you , i would have left that girl. If i were a bord, i would fly.表示一些不切实际的想法或愿望。（这个我印象很深,我问过英语老师.）我还没有见过其他情况。
