一般过去时的被动语态结构是由“was/were”加上过去分词组成。其中，“was”用于单数主语，如“I, he, she, it”等，而“were”用于复数主语，如“we, you, they”等。过去分词是动词的第三个形式，即“-ed”或“-en”，或者是不规则动词的过去分词形式。
1. The cake was eaten by the children. （蛋糕被孩子们吃掉了。）
2. The car was repaired by the mechanic. （汽车被机械师修理了。）
3. The book was written by the famous author. （这本书是由著名作家写的。）
4. The house was sold by the real estate agent. （这幢房子是由房地产经纪人卖出的。）
5. The letter was delivered by the postman. （这封信是由邮递员递送的。）
6. A new shop was built last year. （去年新建了一家商店。）
7. Dinosaur eggs were laid long long ago. （恐龙蛋是很久以前产的。）
8. The computers were not bought last week. （上周没有买电脑。）
9. Were the computers bought last week？ （上周买的电脑吗？）
10. The door may be locked inside. （门可能锁在里面。）
希望这些例句能帮助你更好地理解一般过去时的被动语态结构。