一般过去时的被动语态用于描述在过去某个特定时间发生的动作或状态，强调动作的承受者。其构成是：主语 + was/were + 动词的过去分词。例如：

1. The teaching building was built six years ago.

2. The letter was written by my brother.

3. The cake was eaten by me.

这种语态不需要说明动作的执行者，如果需要提及，可以通过介词短语“by + 动作执行者”来表示。例如：The book was taken from the shelf by someone.