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will be + Vp.p (动词过去分词）
情态动词 + be + Vp.p
1.一般现在时 am/is/are + Vp.p
We clean the classroom every day.
The classroom is cleaned by us every day.
2.一般过去时 was/were + Vp.p
He made the kite.
The kite was made by him.
He put on a coat.
A coat was put on by him.
3. 一般将来时 shall/will/be going to+be+Vp.p
They will plant trees tomorrow.
Trees will be planted by them tomorrow.
He is going to write a letter to his mother.
A letter is going to be written to his mother by him.
4.含有情态动词的被动语态 can/may/must/should +be+Vp.p
I can find him.
He can be found by me.
When can we use the passive voice
(1)不知道或没有必要说明动作的执行者是谁。
Some windows were broken last night.
This book was published in 2003.
(2)强调动作的承受者，而不强调动作的执行者。
Educational CD-ROMs are sold in many countries.
Rice is first grown in China.
主动句改为被动句的方法
把主动语态的宾语变为被动语态的主语．
把谓语变为被动结构（be + Vp.p)．
把主动语态的主语放在介词by后作宾语，将主格变为宾格．
He plays football every day.