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1.教师引导学生观察图片并讨论。
T：Look at the pictures. Are the little bird and the fish happy? Why? What happened? Can you read and find the' reason?
2.让学生读对话，找到答案并进行讨论。教师可引导学生说： Ss: The bird is sad because it lost its hone and the fish is sad because the water is dirty. Our home is becoming worse and worse, so we should care for our earth.
T: What should we do? Today, we will learn some activities and you can see they are right or wrong.
(二)课中探究
i．新课展示Part A Let’s talk
1．播放录音，回答问题
Question1 How will Su Nan go to school?
2.再次播放录音回答问题
Questions2 Does Su Nan have some more soup? Why?
教师引导学生回答：No, he doesn’t, because he has no time. He has to clean his bike. 然后让学生找出文中的原句：I have no time. I have to clean my bike.
板书： have to do… 不得不做某事
引导练习句型： I have to get up early/ do my homework / cook breakfast.
3.继续播放录音，引导学生会话，进一步帮助学生理解对话。 T: Why will Su Nan not go to school in his dad’s car?
S: We shouldn’t drive the car today.
T: Why?
S: Because today is World Car Free Day.
4.why和 why not ?的用法
(三)课后延伸
环保小卫士
设计一份“爬山活动倡议书”。提纲如下：
Hello, everyone. We will climb the mountain this weekend. We will enjoy ourselves there. But don’t forget.
We shouldn’t pick flowers and waste water.
We should _____________________.
(四)总结
(五)作业
课文翻译一遍。
Care for the Earth 教学反思