4. The tree must be put in the hole so that it is straight. The tree must stand straight in the hole.
5. The earth must be put back in the hole again.
6. The earth should be pushed down hard with ....
7. The tree must be tied to the top of the stick ....
8. It should be watered well, ....
学生在做这个练习时，对本课句型与词汇有了进一步认识
《Planting trees(第4页)》出自：www.89xue.com网www.89xue.com ，同时也锻炼了写的能力。
在有条件的学校可放教学录相以加深印象。在全班读熟课文后，展示几幅植树的图片，让学生独自准备几分钟，进行连锁练习，按次序复述instructions。也可两组之间进行比赛，由A组说出第一条注意事项，再由B组说出下一条。最初可完全复述课文原句。熟练后，可全部用主动语态或全部用被动语态，或一句主动语态一句被动语态交替出现，或句子中带有情态动词等方式进行操练。
关于计量表达法的教学建议
本单元第42课教学了计量 (measurement)表达法。
表示计量的方法是：数词+metres/ kilometres +long/wide/deep/high/tall…
表示重量可用数词+kilograms +heavy.
The classroom is 4 metres wide.这个教室有4米宽。
The river is about 10metres deep.这条河大约有10米深。
教师可利用学生身边的事物教学计量表达法。例如描述教室及桌椅，可说出以下句子：
The classroom is 3. 5 metres high, 4. 5 metres wide and 5. 5 metres long.
The table is half a metre high.
也可以出示一幅世界地图，让学生造句：
The Yellow River is 5, 464 kilometres long and between…and…metres deep.
Mount Qomolongma is 8848. 13 metres high.
The Yangtze River is about 6,300 kilometres long.
The lake is between 150 and 250 metres wide.
以上例句呈现完毕后，可让学生自己归纳计量表达法的特点，并将它写在黑板上：
metre (s) /kilometers + long/wide/deep/high/tall …
第43课第一部分和此课练习册 Ex2是为练习计量表达法而设计的。教师还可要求学生造句，造句最多而错误最少的学生将给予奖励。
Lesson 41
Properties: Recorder; Overhead Projector; Pictures
Teaching Objectives:
1. Learn how to plant a tree.
2. Learn some useful expressions.
Language Focus:
neither…nor, tie…to, must, should.
Teaching Procedures:
I. Showing the teaching aims
II. Revision
Check homework. Read some perfect writing to the class.
III .Leading in
T: There are four seasons in a year. They are spring, summer, autumn and winter. Most people like spring. Because we can see trees and flowers. Tomorrow is Tree Planting Day. It’s March 12 tomorrow. So what is happening tomorrow? Lets listen to the tape, try to find the answer.
Get the students to read the dialogue and repeat after the cassette. Then let the students practise the dialogue in pairs.
IV. Teaching Reading
Just let the students understand the reading, do not pay more attention to the new knowledge. Look at the books, read the instructions with the whole class. Explain: just right, neither.. .nor
Read the passage “How To Plant A Tree” and answer the questions at the bottom of the page with the whole class.
The answers are: 1.F 2.F 3.F 4.T 5.T 6.F 7.T
V. Practice
Get the students to listen to the reading. Then read after the tape, ask the class to read it by themselves. Choose some of them to read in class.
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