英语中有两种语态：主动语态和被动语态。 语态是动词的一种形式，用来说明主语和谓语之间的关系。
如果主语是动作的执行者，谓语用主动语态，如“We clean the room every day.”；如果主语是动作的承受者，或者说是动作的对象，谓语则是要用被动语态，如“The room is cleaned every day.” 

被动语态的各种形式：

1) am/is/are +done
　I’m asked to take care of myself.
　Football is played all over the world. 

2) has /have been done
　This book has been translated into many foreign languages.
　The prices of many goods have been cut again . 

3) am/is /are being done
　A road is being built around the mountain.
　Many new houses are being built in this city. 

4) was/were done
　This house was built in 1958.
　His leg was broken in an accident. 

5) had been done
　A new school had been set up by the end of last year.
　When the anthem had been played the conference began. 

6) was/were being done
　The meeting was being held when I was there.
　We were being trained this time last year. 

7) shall/will be done
　More factories will be built in our city.
　He will be taken to hospital tomorrow. 

8) shall/will have been done
　The project will have been completed before July.
　Your clothes shall have been made for you soon. 

9) should/would be done
　He told me that his new cloths would be made by his mother. 

10) should/would have been done
　He told me that his new clothes would have been made very soon.