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 __________.