人教九上U8第4课时导学教案.doc

自主学习方案1.学生自学生词，并记住单词拼写和拼读。2.预习课本，熟读重点短语和句子。（见学习目标）课堂导学方案Step 1 复习Ask the students to tell the story about the “alien”.环节说明：通过复习，进一步练习情态动词表猜测、推断的用法。Step 2 情景导入Ask the students why the Great Wall is there.环节说明：通过提问，激发学生对一些世界奇迹产生兴趣，为本节课作铺垫。Step 3 完成教材2a-2e的任务1.2a学生匹配每个单词、短语的作用。2.2b学生读本节文段，将连接词和短语划线，以检验其2a匹配的正确性。3.2c学生再读文章，完成表格。4.处理2b重难点，学生朗读。5.2d用2a表格中的单词完成句子。6.2e学生讨论其能否想到其他神秘的所在,无论是在中国或世界的另一部分,类似于巨石阵，这些所在你知道些什么?其神秘在什么地方？课堂资料包Step 1 重难点解析1.“And perhaps we might never know,but we do know they must have been hardworkingand great planners!”“也许我们可能永远不会知道,但我们知道他们一定是勤奋伟大的计划者!”must have been doing表示肯定的猜测，肯定某人一直在做的事，并且猜测这种动作,或者行为一直持续到现在。如：She is so tired.She must have been working all the morning.她很疲劳了。她一定工作了一个早上。2.They think the stones can prevent illness and keep people healthy.他们认为这些石头可以预防疾病,使人保持健康。prevent作及物动词，可直接带宾语，表示“阻止，阻挠”的意思；常构成：preventfrom表示“保护不受侵袭”；prevent sb.from doing sth.阻止某人做某事，在主动语态中from可以省略，被动语态中不行。如：These regulations are intended to prevent accidents.这些规章制度旨在防止事故发生。He prevented the boy from climbing the tree.他阻止那个小男孩爬树。Step 2 小结训练(B)1.We _English since 2011.A .have learnedB. have been learningC. have being learning(B)2.What can we do to prevent bird flu from_?Try not to buy or eat chickens that have not been checked.A.spreads B.spreading C.to spread环节说明：学生进一步巩固对must have been doing,preventfrom doing等相关词组的理解和掌握。Step 3 问题探究1.汤姆肯定是一直在打篮球。(完成句子)Tom_ _ _ _basketball.【解析】答案是must have been playing。must have been doing：表示肯定的猜测，肯定某人一直在做的事。2.The boy_ _ (prevent) from climbing up th