教师可分段放录音或在课前事先安排3位学生与教师配合表演这3段对话。然后进行全班、半班或两人一组的练习。教师分段抽查数组表演情况。在学生已基本能分别表演3段对话的基础上，让他们将3段对话串在一起进行表演，教师可用简笔画或手势、动作来提示学生。
最后教师应鼓励学生实际应用所学知识，如让学生根据第41课的 “instructions”，依照第44课的3段对话，自编对话，进行表演。以下4组对话包括了instructions中所有的注意事项，并尽量使用带情态动词的被动语态。如：
1. A: Will you help me plant this tree, please?
B: Of course/Certainly. What do you want me to do?
A: Well, dig a hole large enough for the tree. But don't dig the hole too deep/the hole should not be too deep.
B: OK. I've dug a hole. It’s just right.
2. A: Good. That's done. Hold this stick while I knock it in.
B: OK. Make sure that it is straight.
A: Is it straight (now)?
B: More or less!
3. B: What's next?
A: Put the tree in the hole now/The tree must be put in the hole now.
B: OK. I've done that.
A: Right. I'll put the earth back in the hole again while you hold the tree straight. Then, let's push the earth down hard with our feet several times.
4. B: Good. Now the tree must be tied to the top of the stick to keep it straight.
A: OK. While you're doing that, I'll go and get some water.
B: OK. But can we go and ha
《Planting trees(第3页)》出自：www.89xue.com网www.89xue.com ve a drink after that?
A: A drink? We've only just started! There are twenty more trees to be planted.
(Certainly. Let's go. But we have twenty more trees to be planted. )
◆有关读写方面的教学建议
在阅读的教学过程中，一定要重视语篇的教学，也就是说，在教学的过程中，教师不要过分的强调句子的结构或者是过分的强调句子的语法功能分析，而忽略了文章的本来面目。例如，文章的结构，文章的主题句，文章的基本段落的中心意义等。允其要引导学生将文章中的个别句子放在上下文的语境中进行准确理解。在教学本单元阅读课文时，教师首先要让学生了解课文大意，然后帮助学生分段理解，并可划分段落，找出主题句(topic sentence)。在本课结束时，学生应能复述课文。
在阅读前，教师可设置如下问题，让学生猜测并讨论，以引起他们的阅读兴趣。
What's the Great Green Wall?
Where does China build the Great Green Wall?
What does the Great Green Wall do?
在学生讨论过程中，教师可利用学生用书第III页彩图和教师用书提供的材料 (Notes)，适当给学生们补充一些背景知识 。
T: Sanbei shelter-forest (三北防护林) is known as China’s “Great Green Wall”. It is a “Great Green Wall” of trees, millions of trees. China has built a new Great Green Wall across the northern part, including Inner Mongolia, Shanxi, Hebei, Beijing and Tianjin. The Great Green Wall also covers some of the Northwest (Xinjiang, Qinghai, Gansu, Ningxia and Shanxi) and the western part of the Northeast (Liaoning, Jilin and Heilongjiang). It includes altogether 13 provinces, cities and autonomous regions (自治区). Its total area is 4, 069, 000 square kilometres, which cover 42.4% of the land of China. The building of the Great Green Wall will take 73 years (1978—2050). The Great Green Wall has already saved a lot of land by stopping the wind from blowing the earth away and the sand from moving towards the rich farmland in the south. But more “Great Green Walls” are still needed not only in China but all over the world.
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