Planting trees

Language Focus:

　　Learn how to use measurement and the Passive Voice with modal auxiliaries

Teaching Procedures:

　I. Showing the teaching aims

　II. Revision

　　Check the students’ retelling.

　III. Leading in

　　Let the students look at the following sentences. Pay more attention to the underlined words.

　　1. Peter is one metre seventy tall.

　　2. The room is ten metres long.

　　3. The window is 3 metres wide.

　　4. The hill is 50 metres high.

　　5. The well is 4 metres deep.

　　Ask the students to tell the structure. Point out the position of the adjective at the end of the sentence again.

　IV. Practice

　　Do Exercise 1 in the students' books. Read through the phrases in the boxes, and 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.

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