今日目标：在什么情况下需要用被动结构（掌握2个小知识点即可）
1. 使用被动结构的主要情况
一般情况下，不用被动语态，正式文件中被动较多。同时不知道执行是谁时也需要被动：
The meeting is scheduled for May 3rd. Great atheletes are usually looked up to.
It has been proved that Chen was right.
2. 常常使用被动结构的一些情况
通知、报道、科技文章
No books are to be taken out of the room.
Trade agreement broken,
The mixture is placed in a pan.
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