Ss: Its used for keeping water hot.
为了降低难度，第4段对话也可先让学生仿照前三段对话来提问，教师来回答。然后交换。还可以在适当的时间让学生做group 或pair的连锁问答。
然后教师让学生阅读第38课。在阅读前，设置一些问题，使学生们带着问题有目的地进行快速阅读。
T: Now we are going to read a passage about a group of girls visiting a museum. After reading, youll have to tell me what the girls saw in the museum?
阅读完毕，教师将有关问题和学生们的回答板书在黑板上，一般过去时被动语态中was和were要彩笔标出。然后进行问答练习。
学生再次阅读第66课，要求他们找出上面对话练习中未涉及到的被动语态句子。如：
They were very interested in dinosaurs.
So these eggs were laid long long ago by dinosaurs!
It was discovered in Liaoning Province.
教师引导学生分析课文中哪些句子可改写成一般过去时被动语态。如：
Miss Li showed them a picture of the feathered dinosaur. →
They were showed a picture of the feathered dinosaur by Miss Li.
A picture of the feathered dinosaur was showed to them by Miss Li.
教学设计示例
Lesson 37
Period: The First Period
Content: Lesson 37
Properties: Recorder
Teaching Objectives:
1. Study the grammar: the Passive Voice in the past Simple Tense.
2. Learn some new words and useful expressions.
Language Focus:on show, hundreds of, invent / invention
Teaching Procedures:
Ⅰ. Organizing
Greetings and make a duty report.
Ⅱ. Revision
1. check the homework.
2. Revise the name of objects from the last unit and the Passive Voice: Whats it made of? Wheres it made? Whats it used for? etc.
Ⅲ. Presentation
Present the sentences:
Whats it made of?
Whats it used for?
Then present the sentences:
What was it made of?
What was it used for?
Ask students to compare with the groups sentences.
Ⅳ. Listening.
Part 1. Close books, listen to the tape and answer the questions.
Where did Du Hui go yesterday?
When were the old inventions on show invented?
Play the tape again and make sure students can answer the questions correctly.
Ⅴ. Practice
Ask some students to practice the dialogue.
Then in groups and in pairs. At last let the students act it out.
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英语教案－When was it built?