一、 被动语态的用法：

1. 一般现在时的被动语态构成：is / am / are + 及物动词的过去分词

Our classroom is cleaned every day. 

我们教室每天都被打扫。

2. 一般过去时的被动语态构成：was / were + 及物动词的过去分词

A new shop was built last year. 

去年修了一座新商店。

3. 一般将来时的被动语态构成：will+ be + 及物动词的过去分词

A new hospital will be built in our city. 

我们城市将要修建一家新医院。

4. 现在进行时的被动语态构成：am / is / are + being + 及物动词的过去分词

Uncle Wang is mending my bike now.→ 

My bike is being repaired by Tom now. 

王叔叔正在修理我的自行车。

5. 现在完成时的被动语态构成：has / have + been + 及物动词的过去分词

This book has been translated into many languages. 

这本书被翻译成多种文字。

Many man-made satellites have been sent up into space by many countries. 

在许多国家有许多人造卫星被送上了太空。

6.过去进行时的被动语态构成：was/were + being + 及物动词的过去分词

The new road was being made.

这条新路正在修筑。

7.过去完成时的被动语态构成：had + been + 及物动词的过去分词

The classroom hadn’t been cleaned before the teacher came. 

在老师来之前，教室尚未打扫。

8.将来完成时的被动语态构成：shall/will + have done 

They will have been married for 20 years by then. 

届时，他们结婚将满20周年。

9.含有情态动词的被动语态构成：情态动词 + be + 及物动词的过去分词

Young trees must be watered often. 

小树需要经常浇水。

二、 怎样把主动语态改成被动语态? 

把主动语态改为被动语态非常简单，可以遵循以下几个步骤：

1. 先找出谓语动词；

2. 再找出谓语动词后的宾语；