一. 英语语态定义：
语态(voice) 是一种动词形式，表示主语与谓语动词所表示的动作之间的关系。
二. 分类：
主动语态：active voice
被动语态：passive voice
构成：be+done
三. 使用场景
1. 无需指出动作的执行者或动作执行者不明确时。
Printing was introduced into Europe from China.
2. 为强调动作的承受者。
Four people were killed and thirty-one were injured in the bomb attack.
3. 习惯说法
He was born in 1982.
4. 为了句式结构整齐修辞的需要。
Yesterday he visited our university and was welcomed by the president.
5. 文体的需要。
四.形式
1 一般现在时
The content of each word is collected, along with the word itself.
2 现在进行时
A bridge is being built there.
3 一般过去时
He was hit by a car and his arm was broken.
4 过去进行时
He was being treated in the emergency room when I arrived at the hospital.
5 一般将来时
A new school will be set up in our neighborhood.
6 现在完成时