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情态动词must, can 的区别及其用法
教学过程：
Step 1 Revision
1.look and judge
Look at some pctures and talk about what do they do .
2.Let’ review.
What must we (not) do on the road?
Step2. Fun time
1.Ask and answer.
小组合作，开展“红绿灯”游戏问答，一人演交警，提出问题，指定某人回答，其他人要给予反馈。
示范游戏：（make a model）
（Play the game in groups.）
Step3: Grammar time
1.Order the phrases.
2.Read and find the rules;(must 和 can 区别)
3.Look for a home;（巩固练习）
4. Explain modal verbs;(情态动词后接动词原形)
5.Let’s read and choose;( 巩固练习)
Step4. Consolidation
1.Make rules for other places.
2.Talk about what we must do or not do in these places.
3.Let’s play and check.
4. Watch and think;
5. Write a proposal.（小组合作，每人一句）
6.Stick their tips on the tree.
7. Summary
Step5: Homework
1.Complete the proposal.
2.Follow more rules in public places.