unit 1 when was it invented?the first period section a 1a–2c
teaching aims（教学目标）
一、通过学习，熟练掌握以下词汇：style, project, pleasure, mention二、通过问答，掌握以下句型：
1. a: when was the telephone invented?
b: i think it was invented in 1876.2.
a: what are they used for?
b: they’re used for seeing in the dark.
三、1.正确运用被动语态谈论重要的发明的历史和用途。
2.掌握一般过去时态的被动语态，由was/were+过去分词构成。学会单词invent,以及be used for的用法。
四、通过熟悉我们周围经常使用发明物的历史来开阔眼界，丰富自己的阅历，使自己养成勤于思考，善于总结的好习惯。
本节课的生词较少，而且单词的拼写比较简单，所以学生学起来不会感到困难，如果班级学生的水平较高，可以鼓励学生当堂掌握。）
difficulties（难点）：被动语态/be used for的用法。teaching steps（教学步骤）
1. warm-up and revision（课堂热身和复习）
1）discuss in groups:which do you think is the most useful invention?(2) discuss in groups:
in what order do you think they were invented?a: i think thetvwas invented before well, i think thetvwas invented after thecar.
教学设计说明：利用**引出话题，创设情景，激活学生思维。2. presentation（呈现新知识）work on 1b. listen and answer:
which inventions are they talking about ?
listen again and match the inventions with the years.
3.再听一遍录音，选择方框中合适的短语完成下面的对话。alice:
was your life very difficult when you were a kid?grandma: oh, not really.
why?
alice: well, you didn’tlike a telephone, right?
grandma:of course we did! how old do you think i am? the telephone was invented in
alice: ha, ha! how about cars?
they weren’t invented yet, were they?grandma: yes, they were.
cars were invented in 1885alice: well, did you h**e a tv?
grandma: no, wethey were expensive in those days. the tv was invented around1927, i think.
alice: well, i know that you didn’t h**e a computer, because we learned in school that personalcomputersin 1976.
woman: you’re right. but i h**e one now!
教学设计说明：由易到难，训练听力的同时熟悉本课可功能句。4. pair work
a: when was the telephone invented?b: i think it was invented in 1876.
教学设计说明：有输入变为输出，检查学生掌握本课功能句的情况。完成学习目标45. work on 2a
look at the picture below. what are the things on the table?
教学设计说明：让学生熟读短语并明白其汉语大意。为后面的听力扫清生词障碍。
and number the inventions [1–3] in the order you hear again and complete the chart below
观察与思考：
通过刚才的听力训练，我们来总结一下。
be used for意为“被用来做……”介词for表示目的和用途，后面接___或___例如：knives are used for刀子是用来切东西的。练习：翻译句子。
1)它用来在黑暗中照明2)钢笔是用来写的完成学习目标、 work
用上面**中的信息编对话。谈论时可借助如下对话形式：a: what are they used for?
b: they’re used for seeing in the work
利用所给信息，组织一下对话。
a: when wasinvented?b:
a: who invented it?b:
a: what are they used for?b:
11.小结。检测本课学习情况。12. homework
针对同学们所展示的最有用的发明，介绍发明者，何时发明的，有何用途等写一篇对话。可用下面的语言结构：
what’s the most useful invention?who invented it?
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