Unit 6 When was it invented？（第3课时）
【学习目标】
1.知识和技能目标：
1）谈论重要发明的发明时间，发明者和用途。
2) 了解薯条、茶和篮球的发明历史。
2.过程与方法目标：
1）能运用所学知识练习被动语态的句式。
2）能用所学句型进行交际练习。
3.情感、态度和价值观目标：
充满想象力，善于观察事物，面对难题，用积极的态度解决，发挥创造能力，认识世界，改变世界。
【自主梳理】1. 要求学生翻开课本P45，迅速阅读1a-1e部分的内容。
并按要求完成课本上相应的任务.
2. 检查答案，先要求全班一起给出答案并检查讨论。
【重点领悟】通过谈论薯条的发明，充分掌握被动语态的用法.
【探究提升】初中被动语态语法讲解
(一) 语态分类
英语动词有两种语态.，主动语态和被动语态。主动语态表示主语是动作的执行者，被动语态表示主语是动作的承受者。如：
They will build a new bridge over the river. (主动)
A new bridge will be built over the river. (被动)
汉语中常用“被”、“给”、“由”、“受”等词用来表示被动，而英语用：
助动词be + 及物动词的过去分词构成。
(二) 被动语态的时态、人称和数的变化主要体现在be的变化上，其形式与系动词be的变化形式完全一样。
一般现在时：am / is / are + done
一般过去时：was / were + done
一般将来时：shall / will + be done
一般过去将来时：should / would + be done
现在进行时：am / is / are + being + done
过去进行时：was / were + being + done
现在完成时：have / has + been + done
过去完成时：had + been + done
将来完成时：shall / will + have been + done
过去将来完成时：should / would + have been + done
［注］被动语态没有将来进行时和过去将来进行时。
【学法引领】完成一个任务：
An interesting story for you The history of potato chips Did you know that potato chips were invented __________ invented by mistake? Potato chips were
____________by a chef called George Crum. They were invented 1853 in ______.George Crum cooked them for a were crispy long time until they __________.And he sprinkled really salty lots of salt on them so they were __________.
说明：通过完成一个任务．让学生运用所学内容，既巩固了本课所学的语言目标，又开拓了学生的思维，使学生的思维跳出了课本，培养学生在实际生活中运用本课所学内容，来解决现实生活中的实际问题的能力，真正达到了新课标提出的培养学生综合运用语言的能力。
【巩固训练】
一、根据句意用本单元的词的适当形式填空
1．一Do you know when the computer was i__________?
一In 1976．
2．I don’t know if shoes with a________ heels are comfortable to wear．3．Food cooked in the m__________ oven is not crispy enough．
4．She tasted the soup and added more salt because it wasn’t s_______ enough．5．Did you know potato chips were invented by m__________?
6．Last Sunday．I met a friend who m I hadn’t seen for years by a_________．7．一Where was the bike p_________? 一In Tianjin．
8．The new tea produces a p__________ smell．Would you like to drink some? 9．Remember to pack a c_________ if you want to take pictures there．
【学习反思】本课主要话题是谈论薯条的发明历史。主要练习被动语态的句式用法。通过课前预习，可以增强课堂教学效果。