Planting trees

make up true sentences by themselves. Then check the answers with the whole class.

　　Let the students do some translation exercises.

　V. Presentation

　　Revise the instruction for planting trees, using “should” and “must” .

　　(not + be + past participle). Then tell the students that we can use the Passive Voice in the same way. Give them some examples.

　　1. The homework must be done.

　　2. The fish must be cooked.

　　3. The books should be returned tomorrow.

　　4. The tree must be tied to the stick.

　　5. The hole should be dug first.

　　Let them repeat the sentences. Point out the use of must/ should + Passive Voice. Then help the students change the sentences into the Active Voice and make sure they can understand the difference between the Active and Passive Voice.

　　For instance:

　　We should plant many more trees. (Active)

　　Many more trees should be planted. ( Passive)

　　The Passive Voice is used when it is not necessary to mention the doer of the action.

　VI. Practice

　　Get the students to make up sentences using the words in the boxes. Do Exercise 2 and Exercise 3. First do the first one as an example, then let the students work in pails, and make up sentences. Collect some examples from the whole class.

　VII. Workbook

　　Do Exercise 1 orally first, then write down the answers.

　　For Exercise 2, do it together. The answers are: 1. think 2. long, wide, wide 3.deep, deep 4.high/ tall, high/ tall 5.tall

　　For Exercise 3, Fill in the blanks, check the answers. The answers are:

　　Be, made, long, wide, through, stopped, warm, more, all, in

Exercise in class

　　Put these sentences into the Passive Voice.

　　1. You must finish your work today.

　　2. They can repair the road in two hours.

　　3. We shouldn't laugh at that poor child.

　　4. Can they plant trees in that place?

　　5. They may grow some flowers in the garden.

　　Answers:  1. Your work must be finished today.

　　2. The road can't be repaired in two hours.

　　3. The poor child shouldn't be laughed at.

　　4. Can trees be planted in that place?

　　5. Some flowers may be grown in the garden.

　VIII. Homework

　　1. Revise the contents of this unit, particularly the use of the Passive Voice.

　　2. Make ten sentences in both the Active Voice and the Passive Voice.

探究活动

　　主题班会

　　组织一次以“绿色”为主题的班会。可以让同学们简单介绍一下身边的绿化情况。或者针对将在中国举行的2008年奥运会，以及北京提出了“绿色奥运”的口号，让同学们就此发表一些个人见解或者提出一些建议。

　　资料查找及整理

　　组织同学们到图书馆查找关于国外植树造林或保护环境的资料，然后分组整理出关于这方面的英语文章，要有一定的说服力，并且内容真实严谨。是一篇完整的语篇，上下文连接要紧密，并说明一定的道理，有教育意义。

　　In developing countries people mostly use wood for cooking and heating. They cut down trees for fuel. But a tree cools the land under it and keeps the sun from smaller plants. As the leaves fall, they enrich the soil. When trees disappear, smaller plants die and only sand remains. Yet people need fuel, animals, and crops in order to live.

　　Men can take deserts, but they can also prevent them from getting bigger. Algeria(阿尔及利亚) is planting a green belt of trees along the edge of the Sahara Desert(撒哈沙漠) to stop the sand. In China, too, windbreaks(防风林带) are being built in the northwest to keep the desert from growing.

　　But deserts still threaten the world. Experts believe that land that is on the way to becoming

　　desert equals the size of Australia, Russia and the United States put together. Can we stop the spread of the world's deserts and save the land that is so essential to mankind? Yes, we can. And we must.

　　学写议论文

　　【说明】写一篇大约一百二十个英文字 (words) 的短文, 阐述你对知识的看法。

　　【大纲提示】

　　1. 破題：知识之于人就如同罗盘之于船

　　2. 借題：有了罗盘船才能安全橫渡茫茫大海

　　3. 铺路：知识带来力量，有助于改善生活

　　4. 具体举例1：知识有助于发明机器

　　5. 具体举例2：知识有助于艺术创作

　　6. 具体举例3：知识也有助于食衣住行

　　7. 小结：知识使人类生活方便和精神丰富

　　8. 反面举证1：沒有知识人类会变笨

　　9. 反面举证2：沒有知识人类会回到原始时代

　　10. 反面举证3：沒有知识人类无法继承传统

　　11. 总结1：越多知识，越多智慧

　　12. 总结2：人类不能沒有知识

　　【范文】Knowledge

　　Knowledge is to us what a compass is to a ship.  A ship has to rely on a compass to sail safely across an unknown ocean. Similarly, knowledge brings forth power we need to make real progress toward a better life.  With knowledge, we can invent new and useful apparatus and  machines; we can create beautiful art, including paintings, sculpture, music, and so forth; we can make clothes, furniture, cars, space shuttles and the like.  It is knowledge that enables us humans to lead a convenient and colorful life.  On the contrary, were it not for knowledge, people

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