被动态: The bridge is being repaired.
桥正在修理。
主动态: They were carrying the injured player off the field.
当时,他们正把受伤的选手抬出比赛场地。
被动态: The injured player was being carried off the field.
当时,受伤的选手正被抬出比赛场地。
在被动句中,除现在及过去进行时外,其他进行进态用得非常少。因此像下列这类句子通常不能用被动态:
They have/had been repairing the road.
他们一直在修理这条路。
They will/would be repairing the road.
他们将要修理这条路。
D 助动词+动词原形结构可借助于被动式来构成被动语态:
主动态: You must/should shut these doors.
你必须把这些门关上。
被动态: These doors must/should be shut.
这些门必须关上。
主动态: They should/ought to have told him.
他们本该告诉他才是。(不定式的完成主动式)
被动态: He should/ought to have been told.
本应该告诉他才是。(不定式的完成被动式)
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