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高一英语课件必修2 Unit3 computer


主讲人:徐 国 勤 单 位:范县一中

A Free Talk

abacus
calculator huge computer PC

Next? laptop PDA robot

?Who am I ?

Listening:

Tas

k 1 Skimming
1. Who is the speaker in this story?
A computer

2.In which order is the text organized?
Time order 3. What’s the main idea of the text? A. The computer wants to find “who he is”. B. The function(功能) of the computer. C. The computer becomes popular around the world. D. The change and the applications of the computer.

Task 2:
Read the passage again. Find the topic sentence of each paragraph . Paragraph 1: Over time I have been changed

quite a lot. These changes only became Paragraph2: possible as my memory improved

Since the 1970s many new Paragraph3: applications have been found for me.

1.it took nearly two hundred years before I was built as an analytical machine by Charles Babbage.
【翻译】 过了差不多两百年之后,查尔斯· 巴 比奇才把我制成了一台分析机。

【分析】 it will be/was/takes/took + 时间段+before ...。before引导时间状 语从句。要过多久/过了多久才…

【仿写】 要过很长时间之后我们才能 再次见面。 It will be a long time before we meet _________________________________ again. ___________ 过了一段时间之后他才知道事情的真相。
It was some time before he knew the truth.

before 的不同用法 1.Before he could answer, the telephone was hung up. 还没来得及…就…

2.Write down the telephone number before you forget it. 趁着…未,以免

总结:1.在…前2.过了…才3.趁 着… 未,以免4.还没来得及…就

2. By the 1940s I had grown as large as a room, and I wondered if I would grow any larger. 【分析】 I wonder if ... 是一个常用句 型,意为“我想知道是否……”,常用来 委婉地提出疑问或请求,也可用whether 代替if。如:
仿写 我想知道去你们学校上学是否需要考试。 I wonder whether I need to take exams to enter your school.

3. Over time my memory has developed

so much that, like an elephant, I never forget anything I have been told! 【分析】 此句中包含一个由 so ... that _________ 引导的结果状语从句,在 该从句中又包含一个省略了关系代词 _____ 的定语从句:I have been told, that anything 修饰先行词 _________。

so ... that ... 结构的so + 形容词/ 副词位于句首时, 句子用倒装结 构。
So hard does he work that he seldom goes home.

转换句式:
1.She is so lovely that everyone likes her. So lovely is she that everyone likes her. 2.He drinks so much that he often suffers from headache. So much does he drink that he often suffers from headache.

注意:so that 既可以引导结果状从, 也可以引导目的状从。
1.She hurried, so that she caught the bus.她抓紧赶路,于是赶上了 公共汽车。 2.She hurried so that she could catch the bus.她为了能赶上公共 汽车抓紧赶路。
注意:从句前有逗号的常是结果状从,从句中有情态动 词的常是目的状从。

4.As time went by, I was made smaller.

【翻译】随着时间的推移,我被制 造地更小了。
【分析】as引导时间状从,意思为“随着” 仿写:随着时间的推移,天气变得越来越暖和。

As time goes by, it is getting warmer and warmer. With time going by, it is getting warmer and warmer.

5. I am now truly filled with happiness that I am a devoted friend and helper of the human race!
that引导同位语从句,具体说明 happiness的内容。that是连词,在从句 中不充当任何成分。英语中用that引导 同位语从句的情况比较常见,但有时也 可以用连接副(代)词 how, when, where, whether等来引导同位语从句。

注意:if, which 不能引导同位语从句。 如: I heard the news that our team had won. 我听到了我们队获胜的消息。 l have no idea when he will be back. 我不知道他什么时候回来。 He must answer the question whether he agrees to it or not. 他必须回答他是否同意这样一个问题

Task 3: Cloze test (fill in the blanks orally)

calculating machine I began as a _______ ________ in 1642 in analytical machine France. In 1822 I was built as an_____ _____. Then in 1936 Alan Turing wrote a book and universal ______.As time went ___, I was built a _______ machine ___ by smaller memory improved made_______, but my _____ _______. In the connected __ network 1960s they gave me a family____ __ by a_____. Now people call it the World Wide Web. I have used in ____ and since been _____ ____ offices ___homes the 1970s.So I became a PC. I’m happy to become a devoted friend and helper of the human race.

Retell:
began … calculating … in 1642 … In 1822 … an analytical machine . Then in 1936 Alan Turing wrote … and … a universal machine .As time … I … smaller , but my memory … . In the 1960s … a family connected…. Now… call it…. I have been used …since the 1970s.So I …PC. I’m happy …a devoted friend and …of the human race.

Performance: A debate
As a middle school student ,should we use a computer ?
A: YES B: NO

Homework:
? 1.Retell

the text after class. ? 2.Do exercises on students’ books.


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