课件32张PPT。Unit 3 ComputersThe history of computersRevision:the second generation
(1956-1963)the third generation
(1964-1971)the fourth generation
(1971- )The first generation
(1945-1956)Learning about languageDiscovering useful words
and expressions1.___________
2.___________
3.___________
4.___________
5.___________
6.___________
7.___________
8.___________
9.___________
10.__________complete change in ways of thinking ,working , etc.
connected computer system
to make things easier
to find the answer using numbers
can be moved easily from place to place
to work out the answer to a problem
to travel around an area to find out about it
completely
anyway
activity of managing money
financeanyhowtotallyexploresolvemobilecalculatesimplifyrevolutionnetworkFind the word or expressions fro each of the following meanings from the text.Complete the passage with the words below. My brother was very interested in computers and enjoyed writing programs of his own. He used to download information from the Internet and made good use of it. He liked to ________the World Wide _______ and used the Internet to communicate with computer programmers all over the world. When he went to university he studied IT( information ____________) and developed a special interest in __________ intelligence. After developing special ___________ of the computer, he hopes to design an __________ robot which can think _________ and look like a human being, but in _______ he has a long way to go.exploreWebtechnologyartificialapplicationsintelligentlogicallyrealityWord PuzzleAn abacus It is built to solve some mathematical problems. But it is too big. A huge computerAn old calculating machine used in China until now.It is a new calculating machine which can solve a large number of mathematical problems.A calculatorIt is a personal computer which can solve all kinds of problems and is used widely now. A PC (personal computer) It is a kind of computer which can be taken conveniently like a notebook.A notebook computer1). With the help of computer, you may not find it hard to deal with and share information. (it做形式宾语)
在电脑的帮助下,你会发现处理和分享信息是不难的。
2)This will cost a lot of money, but after all, it is worth buying a computer for every teacher.
为每位老师购置一台电脑要花费很多钱,但毕竟这很值得。
3)If a new situation arises, they will make up new programmes.
如果出现新的情况,他们会补充新的程序。The key sentences:4) Personally, I think the team who won first place cheated.
就我个人而言,我认为赢得第一名的那支队作弊。
5) It is generally believed that IT has both advantages and disadvantages.
人们普遍认为信息技术既有优点又有缺点。
6) In a way, her English has improved but there is still a long way to go.
从某种程度上看,她的英语有所进步,但对她来说,学好英语道路还很长。7) In common with my teammates , I enjoy staying home reading novels when I am on holiday.(现在分词做状语)
和我的同伴们一样,放假时,我喜欢呆在家里看小说。
8) However, people thought I was simple-minded until they discovered I had “artificial intelligence”.
可是人们本来以为我头脑简单,直到发现我有人工智能时,他们才不这么想了。9) Charles Babbage is generally considered
to have invented the first computer.
人们普遍认为第一台电脑是查尔斯巴比奇发明的。
10)The door won’t open anyway.
这门无论如何也打不开。
11) As the years have gone by, computers have been made smaller and smaller.
一年又一年过去了,电脑被制造得越来越小。
12).They had so much work to do that they have to take turns (in/at) looking after their sick mother.
他们都很忙以致不得不轮流照顾生病的母亲。
13) In my opinion, you should watch over your child, who often wanders in the streets.
依我看来,你应该看管好你那个孩子,他经常在街上徘徊。The Passive VoiceChange the Active Voice into the Passive Voice: Group A
1. We have finished our homework.
2. Many visitors have visited the Great Wall.
3. Mike has seen two films since last month.
4. The Russian government has turned these palaces into museums.
Group B
1. Our homework has been finished by us.
2. The Great Wall has been visited by many visitors.
3.Two films have been seen by Mike since last month.
4. These palaces have been turned into museums.
分析:A组强调动作的执行者,是主动语态,
结构:主谓宾,
相同点:两组都是完成时态,
结构: have/has+过去分词
B组的句子强调动作的承受者, 是被动语态.
相同点: 两组都是完成时态
结构: 助动词 have/has been +过去分词
Have/ has been V-ed现在完成时的被动语态1.The new bridge over the Yellow River has just been completed.
2.Many more buildings have been built in the past ten years.表示到现在为止已经完成的某个被动的动作1.被动语态介词固定搭配不能省略。
He has thought of a way of solving the problem.
Eg. The accident which happened yesterday surprised me.=A way of solving the problem has been thought of.2.break out/ happen/ take place/ arrive/ become/ die/ disappear etc 不及物动词没有被动语态3.带双宾语的动词give /send/bring/ take/teach/show/ tell/ make/ sing/ write/ sell/buy/ ask/ pay/ borrow/ lend/ hand/ offer/provide/ past/get/promise 变被动语态有两种方法:(2)=The book has been given to him.(1)=He has been given the book.Eg. I have given him the book. (2) =We have been offered the most comfortable service by him.He has offered us the most comfortable service.(1) =The most comfortable service has been offered to us by him.Change the following sentences into the present perfect passive voice. Put the verbs into the correct form.We have bought a new personal computer.
2.We have found many problems with our new computer.A new personal computer has been bought by us.Many problems have been found with our new computer by us.3. They have built a PC the way we wanted.
4. They have just joined our computer to the Internet.
5. We have used the computer every day since we bought it.
6. We have written a lot of e-mails on the computer in the past year.A PC has been built the way we wanted by them.Our computer has been joined to the Internet by them.The computer has been used every day since we bought it.A lot of e-mails have been written on the computer in the past year. 主动语态表示被动的若干情形:1. 谓语动词用主动表被动的四种情形(1)某些连系动词主动表被动:look, sound, smell, taste, prove, feelThis kind of cloth feels soft. That dog looks dangerous. My advice proved to be wrong.(2) 当open, close, shut, lock, move等用做不及物动词且表示主语的某种属性时,通常用主动形式表示被动意义。他们通常与can’t, won’t等连用。The door won’t shut.Suddenly the door opened. (不强调谁开了门)(3)当read, write, wash, sell, clean, cook, burn, draw, cut, wear等词与well, easily, quickly 等副词连用时,常用主动表被动。The cloth washes well. The poem reads smoothly. The book sells well. This cheese doesn’t cut easily. It’s too soft. This shirt will wear very long. The floor doesn’t clean easily. This kind of rice cooks more quickly than that kind.但是别的时候要看具体情况而定:This book sells well. So far, 200 books have been sold out.The sentence was read clearly by her.(4) 某些表示开始和结束的动作(begin, start, finish, end, etc.),当主语是事物且不强调动作的执行者时,可用主动表被动。When does the concert begin? The play ended at ten o’clock.2.非谓语动词主动表被动的情况:(1)不定式to blame, to let用做表语时,通常用主动表被动。Who is to blame?(该怪谁呢?) The house is to let. (此屋出租。)(2)在“be +形容词+to do”结构中的不定式通常……The question is difficult to answer. Do you think the water is safe to drink? (3) 不定式用于某些动词的(have, have got, get, want, need)宾语后做定语时:I have some letters to write. I want something to drink.但是注意:I have something to type.(我自己打) I have something to be typed. (请别人打)所以:当不定式的逻辑主语和句子的主语一致时就用主动表被动,若不一致,则需用被动表被动。I have a letter to post. (自己寄) I have a letter to be posted. (请别人寄)(4)be worth doing; need / want / require doing (to be done)结构中In all, the book is worth reading. This might be worth thinking about. The plants want watering / to be watered every day. The wall wants repairing / to be repaired.但是:be worthy to be done / of being doneThis book is worthy to be read / of being read.Finish exercises 1,2,3,4 on page 21.
Finish using words and expressions and using structures in workbook on page 56-57.
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