4．Explain
a. 请同学们看这些通知，它们都是失物招领启事。请同学们观察，失物招领启事有什么特点？
b. 对。它们都比较短，比较简单。都留有联系方式。拣到东西可以用Found开头，丢失东西用Lost开头。请同学们注意失物招领启事的写法。 【教学设计说明】
老师给每一组学生一张碎字条（这些碎片是老师提前写好的“失物招领”“寻物启示”，让学生以小组为单位拼好，并能够理解纸条上的意思，然后将字条粘好并张贴在黑板上，看哪一组拼得快，快者为胜）老师在黑板上字条的上方写上“失物招领” 或“寻物启示”。 小组活动，合作探究，充分体现“做中学”的原则。
Step 3: Section B 2b
1．Put these pieces in order to make a message. a. Let’s move to the activity 3b.
b. Would you please write numbers in the boxes? 2．Check the answers
a. Finished, everyone? Would you please check the answers with your partners? b. Let’s check them together.
Answer: Found: A set of keys. Please call David at 529-6403. 3．Read
a. Let’s read the message together. b. Who would like to read it in class? 【教学设计说明】
情景编演剧 “Lost and Found”,该任务需要学生综合运用本单元语言知识，需要小组做出尽快反应，能提高学生的合作意识，反应能力和发散思维，培养学生拾金不昧，助人为乐的优良品质。培养学生自主学习能力和探究精神。
请学生派出代表讲解所拼出的告示之意思，有不明白的地方学生们已经在小组范围内分析。然后将注解中中的各种告示，在理解的基础上，圈出 P17-2b 中的物品。（学生只要明白该告示的意思，可以仿照写，不需朗读。）
Step 4: Section B 2c 1．Write
a. Would you please write a message on your notebooks? b. Please follow the examples in 3a and 3b. 2．Read
a. I think most of you have finished the message. Would you please read it to your partner? b. I would invite some of you to read your messages in class. Who would like to have a try? 【教学设计说明】请学生仿照写“失物招领”或“寻物启示”，老师巡视，抽查出有代表性的作品进行全班范围内订正普遍性的错误。课后让学生将自己的作品进行更改。
Step 5: Games
Guessing game－What is it?
下面我们做一个游戏。两人一组，一个同学在纸上画一个我们学过的物品的画，另一个同学猜它是什么？猜出来，换角色。同学们做这个游戏用的语言是：What’s this? Is this a watch?...
Example: A: What is this?
B: Is this a watch? A: No, it isn’t. B: Is this a ring? A: Yes, it is.
Step 6: Summarize
Let’s summarize what we did in this period. Step 7: Homework Copy the messages in 3a.
The 5th period of class: Section B (3a- Self Check )
Teaching aims（教学目标）
熟练掌握并灵活使用本单元所学知识。 Language points（语言点）
2. 熟练掌握以下句式：
(1) What’s this/that（in English）? It’s a/an…
(2) Is this your pencil? Yes, it is. It’s my pencil. /No, it isn’t. It’s his.
2．要求会写“失物招领或寻物启示”。 Difficulties（难点）：
会写“失物招领或寻物启示”。
Teaching steps （教学步骤）
Lead in:
We have spent four periods on Unit 3. This is the last period of Unit 3. In this period, we will do some exercises and make sure you learn this unit well.
Step 1: Complete the notice with words or phone number in the box. 1．Check the words and the phrases you know
Open your books and look at 3a. If you know the words and the phrases well, please check them.
2．Read
I would like all of you to read the words and the phrases together.
Step 2: Write your own lost or found notice your name and phone number. a．Do you have any other words you don’t know? Please write them in your notebook. b．Please ask your friends for help.
c．Looking up the dictionary is also a good way to study English. I hope you can get more from dictionaries.
Step 3: Self-check-1
Write the school things you know. Step 4: Self-check-3
Complete the chant with pronouns.用代词填空。 Step 5: Self-check-3 1．Write
Write the conversations with the things in the picture in self-check-3. 2．Read
Read the conversations to your partners. 【教学设计说明】
1. 练习一的检查方式可以是以英译汉的形式，也可以适当扩展为请学生造句或回忆当时在什么句子中见到的，说出来。
2. 由一个学生说出数字，其他学生说出单词。先以小组为单位练习，然后请两位学生展开竞赛，为胜利的小组加分。
Step 6: Some extra exercise
Fill in the blanks with the phrases from the box. Step 7: Summarize
Let’s summarize what we did in this period. Step 8: Homework
1．Do the exercises on the students’ book and the textbook. 2．Review Unit 2.
3．Watch the pictures in “Just for fun” on page 12.