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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
动作的执行者是泛指或者不言自明时。
None of the books was taken away.
没有一本书被拿走。
在不知道动作的执行者是谁时。
The toy is designed for children.
这款玩具是为孩子们设计的。
需要强调动作的承受者时。
My bike was repaired.
我的自行车修好了。
出于委婉或礼貌而避谈动作的执行者时。
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。
The problem was talked about just now.