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2、学生能灵活运用use…to…句型
3、开展做画册、演讲等活动，使学生明白我们应该保护地球的道理。
四、教学准备：PPT
五、教学过程：
Step1 Revision
Let’s talk : Retell the text
根据表格来复述课文
Step2 Presentation & Practice
1．Let’s learn
根据复述课文，出示书上grammar time 中的use...to..句型
2.Read the sentences.
3. Find the rules.
T: What else do we use them to do?
学生活动：根据所示图片，选择正确的资源，用use...to...造句
T: Just now you made a lot of sentences with “ use...to...”. How to use “use..to...”? Try to find the rules.
学生活动：根据例句，寻找规律。
4.Try to use
T: Great. Can you use it? Let’s check. Look at these two words. Can we use “use...to...” to make a sentence? （提供water--sit)
T: Do we use water to sit?
T: We use water to water trees. Wood comes from trees. We use wood to make chairs. We use chairs to sit.
学生活动：模仿老师的示范展开发散性思维，进行造句练习。
5.知识拓展： Do you know?
T: We use these things every day. But do you know...?（播放录音并呈现一些图片和数据，告诉学生地球上的水、煤炭、石油、树木还能用多少年）
T: What should we do?
S: We should love and protect our Earth.
6. 过渡到should/shouldn’t句型
Read the sentences and find the rules.
学生活动：观察句子，寻找规律。
7. Try to use.
同桌合作，运用We should... We should not...描述图片。