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put out
Finally, the fire was put out.
30 firemen
kill
Sadly, 30 firemen were killed in the fire.
1. Many trees were burnt.
2. Firemen were asked to help to put out the fire.
3. Finally, the fire was put out.
4. Sadly, 30 firemen were killed in the fire.
观察并找出句中用了什么语态：
Passive Voice (被动语态)
be + done
被动语态的基本结构:
考点一:
从主动语态变为被动语态
1.主语(Subject)
2.谓语(Verb)
3.宾语(Object)
变化：
示例
The boy broke the glass.
The glass was broken by the boy.
介词by 宾语
be done
主语
主
谓
宾
主 谓 宾
即刻操练: 请将下列主动语态变成被动语态