教师在介绍背景知识时，可借助中国地图、手势等使学生大致了解，必要时可用汉语解释。文中划线句子为课文中原句或对原句稍加改动的句子。教师在讲到这些句子时可适当强调、重复，以加深学生的印象。
然后让学生打开书阅读课文。在确知大部分学生已基本掌握课文大意的情况下，要求他们划分课文段落并找出每个段落的主题句 (topic sentence)。然后对文章进行段落的划分。然后让学生归纳出每个段落的大意。
课文的段落划分和主题句或大意如下：
第一段：第l自然段
主题句：Forests help to keep water from running away.
第一段大意：The importance of forests;
第二段：第2—3自然段
主题句：Chinese people have built a new Great Wall.
第二段大意：Something about the Great Wall in China
第三段：第 4—6自然段
主题句：The more trees there are, the better harvests we have.
第三段大意：Something about a worker, who works on the Green Great Wall, thinks highly about the Green Great Wall.
教师还可以让学生填写下表：
THE GREAT GREEN WALL
Special features
across the northern part of China，7，0OO kilometres long，between
400 and l700 kilometres wide
Functions
It stops the wind from blowing the earth away; and stops the sand from moving toward the rich farmland in the south. It has saved a lot of land.
Wang Feng and other workers
They work at Yulin in Shaanxi. They have planted ten thousand tree this year. It’s difficult to work on the Great Green Wall. They have to grow their own food.
提取主题词（key words）也有助于帮助学生复述课文大意。
Forests
keep from, water, soil, floods
China
copy, across, is…long and between…and …wide, stop…from, save, needed, all over the world
Wang Feng
work on…, visit, among, ask, plant, over there, on the hill, five years ago, in a few years’ time, be covered, point to, difficult, grow food, thanks to
在进行写作训练时，可以要求学生仿照课文，写一篇以How to plant flowers in the garden 为题目作文。
关于带情态动词的被动语态的教学建议
本单元在前两个单元学习一般现在时和一般过去时的被动语态的基础上，继续学习带情态动词的被动语态。
在第41课，以显著的位置展示题为“HOW TO PLANT A TREE”的操作规程（instructions），教师如果仅仅是按部就班地讲解，就会使学生感到枯燥乏味。要充分利用课文中所提供的情景，在有意义的情景中教学语法知识。例如，教师可利用简笔画来引出新的语法知识。学生基本掌握instructions大意后，教师应引导他们理解情态动词的用法。到了第43课可采用对比的方法。教师列出两个框框，要求学生分别填上课文中已出现的带情态动词的句子，和可以由主动语态变为情态动词的被动语态的句子，把变化后的句子填入框内。如下表：
1. The ground must be just right.
2. But the hole should not be too deep.
1. The earth should be neither too wet nor too dry.
2. A hole must be dug large enough for the tree. The size of the hole must be just right.
3. A long, strong stick should be knocked into the earth next to the hole. It must be firmly planted.
4. The tree must be put in the hole so that it is straight. The tree must stand straight in the hole.
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