一般过去时被动句的句式变化：
1. 肯定句：主语+was/were+及物动词的过去分词+其他成分。
例如：This desk was made by my father.这张桌子出自我爸爸之手。
2. 否定句：主语+wasn't/weren't+及物动词的`过去分词+其他成分。
例如：This desk wasn't made by my father.这张桌子不是我爸爸做的。
（冉老师有话说：wasn't=was not. Weren't=were not.）
3. 一般疑问句:Was/Were+主语+及物动词的过去分词+其他成分？
例如：Was this desk made by your father?这张桌子是你的爸爸做的吗？
4. 一般疑问句的回答：
①肯定回答:Yes,主语+was/were.
②否定回答:No,主语+wasn't./weren't.