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How many patients were operated on during Dr. Mar’s last visit?
What is needed to carry on with their work?
It is used to help the people who are blind or have other eyes problems in poor areas and it is also used as a training centre.
150 patients were operated on.
Review
Answer the questions
More money is needed to carry on with their work.
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：主动语态和被动语态。
当主语是谓语的执行者时，用主动语态。当主语是谓语的承受者时，用被动语态。汉语中常用“被，给 ，由，受”等词来表示被动，而英语中则用“be +动词的过去分词”来表示。
Example:
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。
1.被动语态的概念
Presentation
2.被动语态的基本用法
很明显动作的执行者是谁。
The plane is used a training centre.
飞机被用作培训中心。
不知道或不需要知道动作的执行者是谁。
The toy is designed for children.
这款玩具是为孩子们设计的。
动作比实施动作的人更重要时。
My bike was repaired.
我的自行车修好了。
在被动语态的句子中, 如果我们需要指出动作的执行者, 可以由by引出。
Mr Wu is liked by all of his students.
所有的学生都喜欢吴老师。
Chinese is spoken by the largest number of people in the world.