过去进行时里,助动词be的过去式后加动词的现在分词形式.
被动语态的一般过去时里,助动词be的过去式后加动词的过去分词形式.
如：
The station was bombed by the terrorists.
I was running at eight o'clock yesterday afternoon.
希望我能帮助你解疑释惑.