二、语法突破
1．定义
过去完成时的被动语态表示过去某个时刻正在进行或者发生的被动动作。谓语动词的主语是动作的承受者而不是发出者。
The goods were being uploaded when we arrived at the airport.
当我们到达机场时，货物正在被装载。
2．构成
(1)肯定句：主语＋was/were＋being＋及物动词的过去分词(＋by＋动作的执行者)
Another bridge was being built over the Changjiang River then.
那时长江上正在建造另一座大桥。
(2)否定句：主语＋was/were＋not＋being＋及物动词的过去分词(＋by＋动作的执行者)
The TV set was not being fixed by him this time yesterday.
昨天这个时候他没有修理电视机。
