主动语态：

We use electricity to run machines.

被动语态：Electricity is used to run machines.

主动语态：

Bell invented the telephone in 1876.

被动语态：The telephone was invented by Bell in 1876.

主动语态：

She steals my bike.

被动语态：My bike is stolen by her.

主动语态：

I have learned English for five years.

被动语态：English has been learned by me for five years.

主动语态：

Everyone trusts me.

被动语态：I am trusted by everyone.

主动语态：

He answers the questions in public.

被动语态：The questions were answered in public.

主动语态：

They are repairing the bridge.

被动语态：A new hospital is being built.

主动语态：

Lucy bought some fruit.

被动语态：Some fruit was bought by Lucy.

主动语态：

Uncle Wang waters the flowers every day.

被动语态：The flowers are watered by Uncle Wang every day.

主动语态：

They didn't clean the classroom yesterday.

被动语态：The classroom was not cleaned by them yesterday.

这些例子展示了主动语态和被动语态在不同句子结构中的使用，希望对你有所帮助。