英语的被动语态，怎么做?

实在太简单了就是宾做主 主做宾
主谓双宾哪一个都可以前提作主语

英语中有主动和被动两种语态。主动语态表示主语是动作的执行者，被动语态表示主语是动作的承受者。只有及物动词才有被动语态。被动语态由“助动词+及物动词的过去分词”构成。被动语态的助动词同样有时态、人称和数的变化。
1.A new computer was bought to me by my father yesterday.
2.The children are looked after very well by Mrs Zhang.
3.He was seen to come into the meeting-room.(这里注意一下：由于see是感官动词，所以改为被动语态后要加to)
4.English is found very useful by us.
5.A lot of trees are planted by him.
后面的“by…”可加可不加，只要句子表示的是被动的意思就可以了。

主动语态中的主语变成被动语态中的宾语.主动语态中的宾语变成被动语态中的主语.时态体现在be上．
be + 过去分词
I clean the room.
The room is cleaned by me.

I cleaned the room.
The room was cleaned by me.

I will clean the room.
The room will be cleaned by me.

I would clean the room.
The room would be cleaned by me.

I am cleaning the room.
The room is being cleaned by me.

I was cleaning the room.
The room was being cleaned by me.

I have cleaned