过去进行时的被动语态的概念：

表示过去某个时刻正在进行或者发生的被动性的动作。过去进行时的被动语态构成：Was / were + being +动词的过去分词
如：They were planting trees at this time yesterday. （主动语态）
        Trees were being planted by them at this time yesterday. （过去进行时被动语态）

过去进行时态的被动语态的基本结构的构成：

1、过去进行时态的被动语态的肯定式为：was/were+being+done。
如：Computer was being majored by him during his college. 他那时正在大学学计算机专业。
        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、过去进行时态的被动语态的否定式为：was/were+not+being+done。
如： The movie star wasn't being stalked by a fan. 那个电影明星正在被一个粉丝跟踪.
3、过去进行时态的被动语态的一般疑问句需将was/were提到主语的前面。（回答用yes或no）
如：Was a new library being put up in their school just then？他们学校当时正在建一座新图书馆吗。
4、过去进行时态的被动语态的特殊疑问句为：疑问词+was/were+(主语)+being+done。
如：What was being done to the machine? 对这台机器要采取了什么措施？

过去进行时态的被动语态的用法：

1、过去进行时态的被动语态的同它的主动语态一样，表示过去正在进行的被动动作。
He is be inginter viewed by our head master now.他正在接受我们校长的采访。
This film is being shown now.这部电影正在被放映。
2、过去进行时态的被动语态一般不与表示一段时间的状语或表示次数的状语连用，这时需要用完成时态的被动语态。
如：The watch is being repaired twice. 改成 The watch has been reparied twice.
The house over there is being built for two months. 改成The house over there has been built for two months.
4、少数及物动词的的进行时表示按计划、安排将要承受某个动作。
如：Some rock music is being played by them next.下面将由他们演奏一些摇滚音乐。
A party is being held tonight.今晚将举办一场晚会。