58虚拟语气-特殊用法

He treats me as if I were his son. He treated me as if I had been his son.

以下情况从句用一般过去式表示虚拟 I would rather you were happier than I. it is hight that 以下情况区别对待，把它本来的时态变成过去式就行了，wish,if only 要不是，否则，as if as though

以防下雨最好呆在家里吧， In case that it should rain,you had better stay at home. In case that it rain,you had better stay at home. It seems neccessary that authorities should inspire their citizens to protect the environment.

特殊用法：以防命贱，从句should do表示虚拟