练习：① Gibert ____________electricity, but Edison ___________ the electric light bulb.

吉尔贝特发现了电，而爱迪生发明了电灯泡。

　　　　　② Bell ________the telephone in 1876.

　　　　　③ Columbus ____America in 1492. （ ）

A. invent B. discover C. invented D. discovered

　　　　　④ The light bulb is one of the most useful _____________(invent) in the world.

　　　　　⑤. What do you think is the greatest ______ (invent) of the twentieth century?

　　　　　⑥. After hard training for a long time, Liu Xiang ____the records again.

A. broke B. achieved C. invented D. completed

　　　　　⑦ I think the telephone was invented in 1876.

A. created B. found C. seen D. used

　　　　　⑧. The mobile phone has influenced people's life a lot since it _________.

A. invents B. invented C. is invented D. was invented

【解析3】一般过去时的被动语态

　I. 定义：表示过去某一时间的被动动作或过去经常性、习惯性的被动动作，无需说明动作

执行者时可省去"by + 动作执行者"。

　II. 结构： 一般过去时的被动语态：

1.肯定结构： 主语 + was / were + 及物动词的过去分词 + by + 动作执行者

　　　Eg：The teaching building was built six years ago. 这座教学楼建于六年前。

　　练习：①( ) Many trees and flowers ___________ in our school last year.

A. plant B. planted C. have planted D. were planted

　　注意： was, were的使用由主语的单复数形式而定，主语为第三人称单数名词、代词或I时用was,

主语为复数名词、代词they或you时用were。

2.否定形式：主语+was / were + not + 动词的过去分词

Eg：The window was not broken by him. 窗玻璃不是他打碎的。

3.疑问形式：was /were +主语+动词的过去分词

Eg：Was your homework finished in time yesterday evening? 昨天晚上你及时完成家庭作业了吗？

Where were those buses made? 那些公共汽车是哪里制造的？

　　注意：一般疑问句通常把was / were置于主语前。

特殊疑问句形式应将一般疑问句置于特殊疑问词后面，

反意疑问句形式应保留was / were。

　III.一般过去时的被动语态疑问句的回答方法

1. 一般疑问句形式肯定回答用"Yes, ... was / were."，

否定回答用"No, ... wasn't / weren't.";

2. 特殊疑问句应抓住特殊疑问词进行回答，可用简略方法，也可用完整方法;

3. 反意疑问句也应用"Yes, ... was / were."或"No, ... wasn't / weren't."进行回答。

　　Eg：（1）-Was your office cleaned yesterday afternoon? 你的办公室昨天下午打扫了吗？

　　　　　　-Yes, it was. / No, it wasn't. 是的，打扫了。/ 不，没有打扫。

（2）-Where was the party held last Sunday? 上周日聚会在哪儿举行的？

　　　　　　-At home. / It was held at home. 在家里。/ 在家里举行的。

（3）-Your debt was paid off at last, wasn't it? 你所欠的债最终被还清了，是吗？

-Yes, it was. / No, it wasn't. 是的，被还清了。/ 不，没有被还清。