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三、教学过程：
1.语态概述：
当句子的主语是动作的执行者时，谓语的形式是主动语态。当句子的主语是动作的承受者时，谓语要用被动语态。被动语态由助动词be+过去分词构成，时态通过be表现出来。
2.被动语态的构成：
被动语态由“助动词be＋及物动词的过去分词”构成。人称、数和时态的变化是通过be的变化表现出来的。
一般现在时：am／is／are＋Vp.p.??
We clean the classroom every day.
The classroom is cleaned by us every day.
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.
?一般将来时：will／shall?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.
情态动词 + be + Vp.p
I can find him.
He can be found by me.
3.被动语态的用法? ?
(1).不知道或没有必要说明动作的执行者是谁。Eg:
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。Eg:
Educational CD-ROMs are sold in many countries.
Rice is first grown in China.
4. 主动语态变被动语态的方法? ??
(1)把主动语态的宾语变为被动语态的主语。?? ?