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英语中的语态有两种：主动语态和被动语态。
当主语是谓语的执行者时，用主动语态。当主语是谓语的承受者时，用被动语态。
Step 2 Presentation
1.Teacher opens a book, then on the blackboard write down:
I open the book.
The book is opened.
2. Give students some passive sentences in the unit, translate them into Chinese.
e.g. We clean the classroom every day. 我们每天都打扫教室。
The classroom is cleaned (by us) every day.
教室每天都被(我们)打扫。
结论：被动语态的基本结构为“主语 + be + 及物动词的过去分词”，其中，be因主语人称和时态的不同要用其适当的形式
一般现在时的被动语态的基本结构为
“主语 + is / am / are + 及物动词的过去分词”。
e.g. The little boy is looked after well in the kindergarten.
The streets are cleaned every day.
一般过去时的被动语态的基本结构为“主语 + was / were + 及物动词的过去分词”。
e.g. The window was broken.
Those old newspapers were thrown away.
2. Summary
主语be动词过去分词一般现在时Iamsupported.You/We/TheyareHe/She/Itis一般过去时Iwassupported.You/We/TheywereHe/She/Itwas3. Practice: Underline the passive voice in the following sentences.
1) The cake was eaten by Daniel.
2) Nancy bought a book yesterday.
3) The little dog is looked after very well by Simon.
4) He is reading English.
5) The computer is bought by my uncle .
6) I am woken up by my father every morning.
Keys: was eaten is looked after am woken up by my father
4. 被动语态的基本用法
1) None of the books was taken away.
动作的执行者是泛指或者不言自明时。