在形式上,与现在事实相反的虚拟语气和将来虚拟都是if + 主语 + did/ were ..., 主语+ would/ should/ could /might + have done; 但是将来时的虚拟还有两种形式,即从句：if+主语+should+do 或者 if+主语+过去式（b...