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步骤教 师 活 动学 生 活 动设计意图Before classEnjoy a song: We are going green.Listen and enjoy.从歌曲中了解生活中保护地球的细节做法，引出本课讨论。Step1. Free talk and revision.
1. Free talk: talk about the song.
2. Revision Story time.
1).To protect the earth, what’s four aspects do you know from Story time?
2) Retell the text: Why should we save them, and how to do?
相机呈现句式use… to…
should… should not…
略作补充：electricity( 电力)coalgas (煤气) gasoline (汽油) come from coal and oil.
We are going green.
Save water, Save energy Save trees. Don’t use to much plastic.
Retell the text.
复习课文四个方面内容，通过Why?和How?的两个问题，指导学生复述课文内容，为后面的讨论唤醒语言储备。Step2 Grammar time.1．Try to make a poem to practice “we use… to…”
1）. Make a model:
Show Teacher’s poem: Water
2） Make a new poem.: Can youMake a new poem and show. Try to read it with emotion.
Use the sentence: use… to…以小诗的形式展开对we use …to…句式的操练。引导学生关注日常生活，结合生活实际，运用句式。
Step2 Grammar time.make a new poem? Choose one of them, talk it in groups. You can choose one form just you like to show us.
过渡：Just imagine: They are all very important in our everyday life. But sometimes, they are unhappy. Just imagine: Why and when?
2. Share a video, try to say We should… We should not…
1).What and think: What did man beings get wrong?
2). Check: What’s your feeling? What shouldn’t the man do?
3). Think and write: How to protect the earth? Write down your ideas, use we should… we should not….
If we do so, the earth will turn green again.
Imagine:
Maybe when…
(When people…
When they are…)
Watch the video.
Share the feelings.
Try to say: The man shouldn’t …