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学会使用祈使句书写书面的规则制度，掌握have to 作为情态动词短语的用法。
Teaching difficult points
have to 的用法（它与其他情态动词不同，can与must 的否定或疑问句式不用借助助动词，而have to 需要借助助动词。）
Teaching steps
Step1 Leading-in (5minutes)
Greet the students as usual. Then, begin the new class. Practice speaking English. Ask students some questions about school rules to review the sentences in the first class. Then, ask some pairs to read 2d.
(设计目的：温故知新。通过采访和对话活动，让学生来介绍学校的规章制度，从而导出本节课的学习重点Grammar Focus.)
Step2 Group work (8minutes)
Read the sentences in Grammar Focus carefully, discuss in groups and try to answer the questions.
1. 祈使句的否定句是怎么构成的？你知道祈使句的肯定形式吗?
2. can 在本单元主要表示什么含义？它还可以表达什么意思？
3. 情态动词在用法上有什么共同点？
4. have to 在句法上与其他情态动词有何区别？
(设计目的：通过回答以上问题，引导学生总结本单元的语法要点并培养学生独立思考和小组合作学习的能力。）
Step3 观看微课进一步巩固学习祈使句的用法。（5minutes)
Let students watch a small class to study the imperative sentences.
(设计目的：通过观看微课进一步学习祈使句的用法。）
Step4 3a学以致用（Look and write）(5minutes)
Show some pictures to students and ask them to write the rules for the school library. Then share their rules with their classmates.
（设计目的：通过此项活动，一方面让学生复习巩固否定祈使句的用法；另一方面，培养学生仔细观察、认真思考的习惯。）
Step5 Pair work (3b) (5minutes)
Please use the words and pictures to make questions and act it out one by one. Give students several minutes to prepare for it and then ask some pairs to act it out.
(设计目的：通过本活动，引导孩子对所学知识进行灵活运用并培养他们的合作学习能力。）
Step6 Group work (3c) (10minutes)
Imagine you have a new school, please work in groups and make five cool rules for your dream school. Several minutes later, share them with your classmates. Your classmates vote(投票) for the Coolest School!
(设计目的：巩固运用本节所学知识，培养学生积极向上的思考习惯。）
Step7 Summary (5minutes)
Help students to go over the key points in this class. Give students several minutes to discuss their problems. If necessary, help them solve the problems.
（设计目的：学后总结本节所学知识并帮助他们复习本节重难点。）
Step8 Homework