例如：Many people speak Chinese.
被动语态表示主语是动作的承受者，即行为动作的对象。例如：Chinese is spoken by many people.主语English是动词speak的承受者。
过去完成时：had been + spoken
例如：Some new computers were stolen last night. 一些新电脑在昨晚被盗了。(不知道电脑是谁偷的)
This bridge was founded in 1981.这座桥竣工于1981年。
例如：The glass was broken by Mike.玻璃杯是迈克打破的。
This book was written by him.这本书是他写的。
Your homework must be finished on time.你们的家庭作业必须及时完成。
All the people laughed at him.
He was laughed at by all people.
They make the bikes in the factory.
The bikes are made by them in the factory.
He cut down a tree.
A tree was cut down by him.
We can repair this watch in two days.
This watch can be repaired in two days.
They should do it at once.
It should be done at once.
1.He made the boy work for two hours yesterday.
The boy was made to work by him for two hours yesterday.
2.Mother never lets me watch TV .
I am never let to watch TV by mother.
3.Jack gave Peter a Christmas present just now.
(1)A Christmas present was given to Peter by Jack just now.
(2)Peter was given a Christmas present by Jack just now.