Unit 6 Don’t eat in the class. Section A（ 2a-4）一、【学习目标】： 1. 掌握重点词汇，用英文表达一些标志的含义。2、学习情态动词 have to 的各种句式的变化。3、学会用 can ，don't , have to 等与他人讨论规章制度。4 提高听说技能二、【知识学习】：I、新课呈现Step1 RevisionReview the school rules at P19. Step2 Presentation Present key sentences in this period.This is a great school, but there are a lot of rules.Can we bring music players to school?And we always have to wear the school uniform.And we also have to be quiet in the library. Step3 ListeningListen and finish 2a and 2b. Check the answers.Step4 Pair work Talk about the rules in 2a.Step5 Role-play Role-play the conversation in 2d.II、合作交流 Group work: 分析总结情态动词 can 的用法，并练习造句。 Notes:_________________________________________________________三、【问题探究】：知识点拨1. 情态动词 have to 的用法，意思是"必须、不得不"，它侧重于客观上的必要和外界的权威。（1）结构：主语＋have to＋动词原形＋（主语是第三人称单数时，用 has to；句子是过去时，用 had to.）如：We have to （穿）sneakers for gym class. 在体育课上，我们必须穿运动鞋。Tom has to （练习） guitar every day. 汤姆每天必须练习弹吉它。否定形式：主语＋don't have to do sth. ==== 主语+ needn't do sth. 常翻译成“ ...没必要做某事，不必...”（单三人称时，用 doesn't have to. 句子是过去时，用 didn't have to, needn't 适合任何主语）如：Nick wear a uniform. 尼克不必穿制服。We do our homework at once. 我们不必马上完成作业I don't have to go to school today.. ==== I needn't go to school today.（3）疑问句：Do （Does 或 Did）＋主语＋have to ＋动词原形＋其他如： you stay at home on weekends? 周末你必须呆在家里吗？Yes, I do. / No, I don't. 2 . else 和 other 的区别else 和 other 都有表示“其它”的含义，else 只修饰两类词，并放在该词的后面：不定代词 someone / someplace/ anything；...
