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2. The plane is also used as a training center.
3. Also, local doctors and nurses are invited on board to learn about eye operations.
4. 150 patients were operated on.
Read and find out
被动语态
We call the boy Tom.
The boy is called Tom.
Active voice主动语态
Passive voice被动语态
语态是动词的一种形式，表示的是主语和谓语之间的关系。英语中的语态有两种：主动语态Active voice和被动语态Passive voice。
当主语是谓语的执行者时，用主动语态。基本结构是：sb do sth。当主语是谓语的承受者时，用被动语态。基本结构是：sth be done如：
We clean the classroom every day.
我们每天都打扫教室。
The classroom is cleaned (by us) every day.
教室每天都被(我们)打扫。
The lights were turned off by Tom.
The windows are cleaned every week.
Millie’s closed the door.
The TV was turned on.
The boy made a model plane.
A total(总数) of 8 questions are answered.
or
Active
Passive
Passive
Passive
Active
Passive
Active
Passive