人教版高一必修二book2 unit3 Computers grammar 课件
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英语必修二人教版 Unit3 Computers2.3+grammar
2.I have lost my watch just now. I lost my watch just now. I have just lost my watch.
3.He walked to work in the past few years. He has walked to work in the past few years. He walked to work in the past.
4. ---- How long ____ at this job? ---- Since 1990. A. were you employed B. have you been employed C. had you been employed D. will you be employed
5. When and where to go for the onsalary holiday ____ yet.
现在完成时和一般过去时的区别
★现在完成时强调过去的动作对现在有影响；一般过去时
只表示过去某个具体时间里发生的动作，与现在没有联系。
Jane left an hour ago . Jane has left now.(她现在已经不在这里了。)
★两者都可表示过去开始并延续了一段时间的动作，但现
在完成时表示动作可能还要继续下去，而一般过去时则说 明动作已经结束。
Complete the following sentences：
1. 脏衣服都已经洗了。
The dirty clothes___h_a_ve__b_e_e_n_w__a_s_h_e_d_. ____. 2. 这项计划已经由专家改动过三次了。 The plan__h_a_s__b_e_e_n_c_h_a_n_g_e_d___by the experts for three times. 3. 我的电脑很快就被修理好了。 My computer _h_a_s_b_e_e_n__re_p_a_i_re_d__very quickly. 4. 这个问题还没有解决。 The problem __h_a_s_n_o_t_b_e_e_n__s_o_lv_e_d___yet.
3.He walked to work in the past few years. He has walked to work in the past few years. He walked to work in the past.
4. ---- How long ____ at this job? ---- Since 1990. A. were you employed B. have you been employed C. had you been employed D. will you be employed
5. When and where to go for the onsalary holiday ____ yet.
现在完成时和一般过去时的区别
★现在完成时强调过去的动作对现在有影响；一般过去时
只表示过去某个具体时间里发生的动作，与现在没有联系。
Jane left an hour ago . Jane has left now.(她现在已经不在这里了。)
★两者都可表示过去开始并延续了一段时间的动作，但现
在完成时表示动作可能还要继续下去，而一般过去时则说 明动作已经结束。
Complete the following sentences：
1. 脏衣服都已经洗了。
The dirty clothes___h_a_ve__b_e_e_n_w__a_s_h_e_d_. ____. 2. 这项计划已经由专家改动过三次了。 The plan__h_a_s__b_e_e_n_c_h_a_n_g_e_d___by the experts for three times. 3. 我的电脑很快就被修理好了。 My computer _h_a_s_b_e_e_n__re_p_a_i_re_d__very quickly. 4. 这个问题还没有解决。 The problem __h_a_s_n_o_t_b_e_e_n__s_o_lv_e_d___yet.
高中英语：Unit 3 Computers Grammar(新人教必修2).pptx
8. Every possible means
to prevent the air pollution.
A. is used
B. are used
C. has been used
D. have been used
9. No permission
for anyone to enter the building.
C. isn’t being decided
D. aren’t decide
学海无涯
第 3 课时 Grammar 基础练习 1. have been used 2. have been told 3. have been found 4.have been put into
单项选择 1-5 CABDB 6-10 DBCAD 句型转换 1.as well as 2.as, went 3.so that 4.have been written 5.such strong that 单句改错 1.given 后面加to 2.offer 后面加 to 3.just 后面加 been 4.were 改 成 have been 5.去掉 been
B. had ruined D. had been ruined Beijing says that all
construction work for the Beijing
by 2006.
A. has been completed B. has completed
C. will have been completed
3. Great changes
in the city, and a lot of factories
.
A. have been taken place have been set up
人教版高一英语必修2Unit 3 Computers 全套课件
Difficult Points
1. the understanding of the technological items;
2. Master the phrases which are related with time; 3. Have the ability to express own ideas and tell the reasons of your point.
Important and Difficult Points
Important Points
1. Understanding the history of the computer and its broad application. 2. Able to tell an event according to the time. 3. Have the ability to express own ideas and tell the reasons of your point.
Expressions:
from….. on so… that… in a way as a result human race with the help of
deal with
watch over
Functional Items
1. Making decisions
2. Giving reasons
Lead-in
Look at these pictures. What are the inter-relationships of them? Abacus
An ancient calculating tool of China which has thousands years’ history.
人教版(新课程标准)必修2Unit3Computers复习课件
目录
14.intelligent robots 智能机器人 15.make a list 列清单 16.artificial intelligence 人工智能 17.be part of an android football team 成为机器人足球队的一员 18.have a good shot for a goal 有好的机会射门
目录
14.watch over看守；监视；守护；照看 watch out (for...) 注意；谨慎 (……) watch for 守候；当心；等待 keep a close watch on 密切监视 be on watch 值班；看守
目录
1.with the help of my electronic brain 在我电子大脑的帮助下 2.from then on 从那时起 3.after all 毕竟；终究 4.what they have in common 他们拥有的共同之处 5.share my knowledge with others 与他人分享我的知识 6.work out a list 列出清单
目录
3.sum n.总数；算术题；金额vt.总计，概括 vi.合计 •in sum 总而言之 a large sum of 一大笔；大量的 •sum up 总结，概括 eg. They donate a large sum of money to the Red Cross every year. 他们每年都向红十字会捐献大笔的钱。
目录
12.arise vi.(arose，arisen；arising)起身，起来(stand up)；起床(get up)；出现； 产生；产生(appear，happen，occur) arise from/out of... 由……引起/产生 arise from... 从……上站起来 eg. (北京卷书面表达)I didn’t expect our tea culture should be so attractive and therefore, a sense of pride in my mind arose. 我没想到我们的茶文化会如此吸引人，因此，我心中升起了自豪感。
14.intelligent robots 智能机器人 15.make a list 列清单 16.artificial intelligence 人工智能 17.be part of an android football team 成为机器人足球队的一员 18.have a good shot for a goal 有好的机会射门
目录
14.watch over看守；监视；守护；照看 watch out (for...) 注意；谨慎 (……) watch for 守候；当心；等待 keep a close watch on 密切监视 be on watch 值班；看守
目录
1.with the help of my electronic brain 在我电子大脑的帮助下 2.from then on 从那时起 3.after all 毕竟；终究 4.what they have in common 他们拥有的共同之处 5.share my knowledge with others 与他人分享我的知识 6.work out a list 列出清单
目录
3.sum n.总数；算术题；金额vt.总计，概括 vi.合计 •in sum 总而言之 a large sum of 一大笔；大量的 •sum up 总结，概括 eg. They donate a large sum of money to the Red Cross every year. 他们每年都向红十字会捐献大笔的钱。
目录
12.arise vi.(arose，arisen；arising)起身，起来(stand up)；起床(get up)；出现； 产生；产生(appear，happen，occur) arise from/out of... 由……引起/产生 arise from... 从……上站起来 eg. (北京卷书面表达)I didn’t expect our tea culture should be so attractive and therefore, a sense of pride in my mind arose. 我没想到我们的茶文化会如此吸引人，因此，我心中升起了自豪感。
人教版高中英语必修二Unit 3 Computers( grammar)(共23张PPT)
Group-work round 2
Computer games have been regarded as a waste of time.
Group-work round 2
It has been wellknown that teachers can help you with your study.
---- Great. Isweanntt etonsceee PpearstotnealrTnasilor.
---- I'm afraid it _h_a_s_n_o_t_b_e_e_n_s_h_o_w_n___(还没上
映) yet.
----SHtohw. ahbaovuet/thhaesFibreesetnordmo?nH_e_a(_sb_iyt_..b_.)e_e_n_s_h_o_w_n （S它th上.映ha了v吗e/）hyaest?not been done
Have fun!
Look around carefully. Close your eyes. Someone will make some changes in the classroom. Check what has been changed.
Group-work
Round 1
Group-work
Lead-in
The similar jacket to Kimi has been sold on the internet.
Present
• The programme has been broadcasted since November.
• The five children have been educated through the game.
人教版高中英语必修二课件Unit3Computers——grammar课件
【学以致用】My brother has
bought thisFbike for almost four years.（改错） HowT long has this book
been bought（判断正误）
（4） 带有双宾的词，如__g_i_v_e,_,s_e_n_d_,b,_ri_n_g_， __ta_k_e_,_te_a_c_h,,_te_l_l_,w__r,i_te_,_b_u_y,p_a_y___等，变为被动语 态时，将其中一个宾语变为主语，其他借助介词 to 或者for。 【学以致用】The teacher has given twins a book. （用被动时态对句子进行改写）
Their photos have been made fun of by the netizens.
现在完成时被动态结构：
have /has +been +过去分词
时间状语 现在完成时常与already ,yet recently ,so far ,by now, up till now ,since .....,before......等连用
had been done
过去将来时
would be done
一般将来时
will be done
现在完成时
have/has been done
歌诀是：被动语态be字变，过去分词跟后面。
ห้องสมุดไป่ตู้
现在完成时态
定义：现在完成时的动作或情况虽然发生在
过去，但它强调的是与现在的关系，用来说 明现在的情况。 现在完成时态结构：(have/has + 过去分词)
思
The programme has been broadcasted since November.
bought thisFbike for almost four years.（改错） HowT long has this book
been bought（判断正误）
（4） 带有双宾的词，如__g_i_v_e,_,s_e_n_d_,b,_ri_n_g_， __ta_k_e_,_te_a_c_h,,_te_l_l_,w__r,i_te_,_b_u_y,p_a_y___等，变为被动语 态时，将其中一个宾语变为主语，其他借助介词 to 或者for。 【学以致用】The teacher has given twins a book. （用被动时态对句子进行改写）
Their photos have been made fun of by the netizens.
现在完成时被动态结构：
have /has +been +过去分词
时间状语 现在完成时常与already ,yet recently ,so far ,by now, up till now ,since .....,before......等连用
had been done
过去将来时
would be done
一般将来时
will be done
现在完成时
have/has been done
歌诀是：被动语态be字变，过去分词跟后面。
ห้องสมุดไป่ตู้
现在完成时态
定义：现在完成时的动作或情况虽然发生在
过去，但它强调的是与现在的关系，用来说 明现在的情况。 现在完成时态结构：(have/has + 过去分词)
思
The programme has been broadcasted since November.
高中英语必修二Unit3-Computers-Grammar语法课件
China since 1978.
17
2) open, break, drop等不强调动作发出者 时常用主动语态。如： [误] The door has been opened of itself. [正] The door has opened of itself. 3. 短语动词不可分割或省略其中的介词
(1) 不知道或没有必要说明动作的执行者 是谁。
如: Some new computers were stolen last
night. 一些新电脑在昨晚被盗了。
(不知道电脑是谁偷的)
This book was published in 1981.
这本书出版于1981年。
21
(2) 强调动作的承受者, 而不强调动作的执 行者。 如: The window was broken by Mike.
28
Look at the way your face has been washed Look at the way your hair has been combed Look at the way your shoes have been cleaned You’d better do them again. Look at the way the flowers have been planted Look at the way the grass has been cut Look at the way the paths have been swept I hope that you’ll come here again.
believed. 16
2. 并不是所有动词都有被动语态
1) happen, take place, break out, belong to, cost, last等不及物动词或词组无被 动语态。如： [误] Great changes have been taken
17
2) open, break, drop等不强调动作发出者 时常用主动语态。如： [误] The door has been opened of itself. [正] The door has opened of itself. 3. 短语动词不可分割或省略其中的介词
(1) 不知道或没有必要说明动作的执行者 是谁。
如: Some new computers were stolen last
night. 一些新电脑在昨晚被盗了。
(不知道电脑是谁偷的)
This book was published in 1981.
这本书出版于1981年。
21
(2) 强调动作的承受者, 而不强调动作的执 行者。 如: The window was broken by Mike.
28
Look at the way your face has been washed Look at the way your hair has been combed Look at the way your shoes have been cleaned You’d better do them again. Look at the way the flowers have been planted Look at the way the grass has been cut Look at the way the paths have been swept I hope that you’ll come here again.
believed. 16
2. 并不是所有动词都有被动语态
1) happen, take place, break out, belong to, cost, last等不及物动词或词组无被 动语态。如： [误] Great changes have been taken
人教版高中英语新课标必修二Unit3 Computers知识点详解整理
英语必修二Unit3 Computers拓展词汇1.simplify vt.简化；使简明simple--complicated（复杂的）adj. simplify---complicate（使复杂化）vt.-fy “形成”“变成”“使……化”beautify，classify2.It takes +一段时间+before+从句过了一段时间后才……It will (not) be +时间段+before+从句（现在时）要过一段时间后才……（用不了一段时间就……）It was (not) be +时间段+before+从句（过去时）过了一段时间后才……（没过一段时间就……）3.solve vt.解决；解答【变形】solution n.解决，解答the solution to the problem【辨析】solve & settle4.reality n. [U]现实；真实[C] 事实；实际truth/as a matter of fact5.随着……As time went by,......(从句)With time going by,......（复合结构）6.go by (时间)逝去，过去；走过；经过；（机会等）轻易错过7.as a result 因此，结果（+结果）as a result of 由于……，作为……的结果（+原因）result from 由……引起，起因于result in 导致，造成8.totally adv. 完全地；整个地9.so...that 如此……以至于（+结果状语从句)置于句首--倒装结构So tired was she that he fell asleep as soon as he lay down.10.application n.[C,U]应用；用途；申请；请求make an application (to sb.) for （向某人）申请……an application form 申请表【变形】11.explore v.探测，勘察，探险；探究，考察【形近词】explode 爆炸explain 解释说明export 出口，输出12.anyhow adv.1）（转换话题、结束谈话或回到原话题时说）无论如何，反正Anyhow I don’t like it.2）而且，加之，反正I don’t want to go out and anyhow it is raining.3）尽管，即使这样I am afraid I can’t come, but thank you anyhow.13.goal n.14.of high qualityof +修饰词（high，great，little，some，no 等）+抽象名词（value,importance，use，help，interest等）作定语或表语=adj.15.intelligent adj. 智能的，聪明的intelligent machines/systems 智能机器/系统【变形】intelligence n.智力；才智；智慧intelligence quotient =IQ智商e true 实现，成为现实（无被动）become a reality 实现realize 实现17.give away捐赠，赠送；分发，颁发；泄露，暴露18.signal1) v. 发信号；示意2)n.信号，暗号a danger/warning signal 危险/警告traffic signals 交通信号19.personally adv.1）就个人而言=in one’s opinion2）本人；亲自by oneself20.in a way =in one/some way在某种程度上in the way/in one’s way 挡道，碍事in this/that way 以这种/那种方式in any way 在任何方面by the way 顺便说一下，顺便问一下by way of 经由……on one’s/the way to 在去……的途中in no way 决不，一点儿也不21.arise vi.1）出现；发生，产生2）（由……）引起；（因……）产生22.make up1)组成，构成被动形式be made up of2)编造，虚构3)化妆，打扮4)弥补（常与for连用）23.after all1)终究；归根结底（结果与预想不同，句尾）2)毕竟，别忘了（解释或说明理由，句首at all 完全，根本(否定，疑问，表条件的从句) not ...at all 一点也不above all 首先，最重要的是，强调最重要的in all 总共，总计=in total24.with the help of sb. =with one’s help 在……的帮助下；借助（be）of great help 非常有帮助come to one’s help 来帮某人的忙can't help but do sth. 不得不做某事can't help doing sth. 忍不住做某事help...out 帮助……摆脱困境help oneself to 自用；自取25.deal with1）对待；对付；处理2）与……交易3）论及；涉及how to deal with...what to do with...26.watch over1)看管；照顾。
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1. All the preparations for the task ____,
and we’re ready to start.
A. completed B. complete C. had been completed D. have been done
2. ---- How long ____ at this job?
Conclusion:
1. 使用现在完成时的被动语态要注意以下几点: 1) 现在完成时的被动语态的两个助动词，即
have/has和been，两者缺一不可。
2) 只有及物动词才有被动语态，不及物动词（词组）
没有被动语态, 如:happen, take place, die, appear,
disappear, fail, remain, lie, last, sit , stand, break out, come true, belong to等．
3．—Can we sit at the table near the window? —I’m sorry，but it________already. A．was taken B．took C．has taken D．has been taken 解析：选D。it代指the table，和take之间是被动 关系；又根据already和句意可知用现在完成时， 故答案选D项。
5．Her novel is very popular among people of all
ages；so far it____________(translate) into 25
languages. 答案：has been translated
II. Choose the best answers.
B. have not been decided
C. is not being decided
D. has not been decided
4. Betty___ injured since last Saturday.
A . has been
C. is
B. was
D. has
5. That book _________into at least 20 foreign languages. A. has said to be translated B. has been said to have translated C. is said that it had been translated D. is said to have been translated
3) always, never, hardly, seldom等副词置于have/has和been中间。如: [误] Such a man has been hardly believed. [正] Such a man has hardly been believed.
begin，start，buy，marry，open，join等 构成的现在完成时的被动语态不能与表示 一段时间的状语连用。若要表达相应的意 思，则要改换动词或时态。
Task4 Consolidation.
Ⅰ. 用括号内动词或词组的适当形式填空 1．More than 5,000 used bikes__________________ (collect) since the two brothers set up the organisation. 答案：have been collected 2．Since the cause of this disease________________ (discover)，now we need to develop the medicine to treat it. 答案：has been discovered
现在还拿不到这些信件)
The work has already been finished. 工作已完成了。(结果是，现在不用做这项工作了)
2) 表示一个被动的动作或状态开始于过去，持续
到现在，并有可能持续下去，常与for或since引导
的时间状语连用，或用于How long...？句型中。例 如： The plan has been discussed for nearly 2 hours. 这项计划已被讨论了近两个小时了。
3． ─Have the cars been repaired？ ─No，they haven’t．
这些汽车修好了吗？ 不，还没有。
How long has her work been finished？ 她的工作完成有多久了？
2. 现在完成时被动语态的各种句式：
[肯定式] have/has＋been＋done Your computer has been repaired. 你的电脑已经修好了。
3．Over the past ten years，this town __________ (hit)twice by earthquakes.
答案：has been hit
4．—Will the lecture be held at 4 o’clock this
afternoon?
—No. It__________________(put off)till tomorrow afternoon. 答案：has been put off
答案：have been cut down
5．我喜欢这部科幻电影，它已经在电视上播了三 次了。 I like this science fiction film and it _____________ three times on TV. 答案：has been shown
Ⅱ. 单项填空 1．His sister left home in 1998，and _______since. A．had not been heard of B．has not been heard of C．had not heard of D．has not heard of 解析：选B。考查时态及语态。句意为：他姐姐 1998年离家出走，从此杳无音信。根据句中since可 知本题需用完成时，同时根据句意可知需用现在完 成时的被动语态。故选B项。
她的工作完成有多久了？
3. 现在完成时被动语态的主要用法
1) 表示过去发生的动作对现在造成的影响与结果。
当动词为短暂动词时，可与already或yet连用，但
不能与for或since引导的表示一段的时间状语连用。 例如： I’m sorry，but the letters haven’t been typed yet. 很抱歉，这些信件还没有被打印出来。(结果是，
3．这座城市明年将建多少座大楼？
How many high buildings ________________in
this city next year?
答案：will be built 4．为了多种一些谷物，很多树被砍掉了。 Large numbers of trees ______________to grow more grain.
---- Since 1990.
A. were you employed B. have you been employed C. had you been employed D. will you be employed
3. When and where to go for the on-salary holiday ____ yet. A. are not decided
4. I want to buy this kind of cloth because I_______ the cloth ________well. A．have told；washed B．have been told；washes C．have been told；washed D．was told；washed 解析：选B。根据句意“因为我被告知这种布很好 洗”可知第一空用完成时的被动语态；第二空表示 主语具有的属性，用主动表被动，故用washes。
[否定式] have/has＋not＋been＋done
The desks have not been cleaned. 这些桌子还没有擦干净。
[疑问式]Have/Has＋主语＋been＋done?
—Has the door been painted?
那扇门粉刷了吗？ —No，it hasn’t.不，还没有。 [特殊疑问式] 疑问词＋have／has＋主语＋been＋done How long has her work been finished？
3) 用在时间或条件状语从句中，表示将来某时已
完成的动作，即用现在完成时的被动语态代替将 来完成时的被动语态。 You can go home as soon as your task has been finished. 你的任务一完成就可以回家。
Task 2 Test yourself!
Ⅰ. 完成句子 1．由于大雪，高速公路已经被封闭。 The freeway _______________because of the heavy snow. 答案：has been closed 2．对不起，先生，这次展览的门票已经全部卖完 了。 Sorry，sir，all the tickets for the exhibition ________________. 答案：have been sold out
Unit 3 Computers
Period 4
语法专题课
Task1. Presentation
I. Read the sentences from the text, paying attention to the underlined parts. 1.Over time I have been changed quite a lot. 2. …, I have been used in offices and homes since the 1970s. 3. … I never forget anything I have been told! 4. Since the 1970s, many new applications have been found for me. 5. I have also been put into robots and used to make mobile phones as …
and we’re ready to start.
A. completed B. complete C. had been completed D. have been done
2. ---- How long ____ at this job?
Conclusion:
1. 使用现在完成时的被动语态要注意以下几点: 1) 现在完成时的被动语态的两个助动词，即
have/has和been，两者缺一不可。
2) 只有及物动词才有被动语态，不及物动词（词组）
没有被动语态, 如:happen, take place, die, appear,
disappear, fail, remain, lie, last, sit , stand, break out, come true, belong to等．
3．—Can we sit at the table near the window? —I’m sorry，but it________already. A．was taken B．took C．has taken D．has been taken 解析：选D。it代指the table，和take之间是被动 关系；又根据already和句意可知用现在完成时， 故答案选D项。
5．Her novel is very popular among people of all
ages；so far it____________(translate) into 25
languages. 答案：has been translated
II. Choose the best answers.
B. have not been decided
C. is not being decided
D. has not been decided
4. Betty___ injured since last Saturday.
A . has been
C. is
B. was
D. has
5. That book _________into at least 20 foreign languages. A. has said to be translated B. has been said to have translated C. is said that it had been translated D. is said to have been translated
3) always, never, hardly, seldom等副词置于have/has和been中间。如: [误] Such a man has been hardly believed. [正] Such a man has hardly been believed.
begin，start，buy，marry，open，join等 构成的现在完成时的被动语态不能与表示 一段时间的状语连用。若要表达相应的意 思，则要改换动词或时态。
Task4 Consolidation.
Ⅰ. 用括号内动词或词组的适当形式填空 1．More than 5,000 used bikes__________________ (collect) since the two brothers set up the organisation. 答案：have been collected 2．Since the cause of this disease________________ (discover)，now we need to develop the medicine to treat it. 答案：has been discovered
现在还拿不到这些信件)
The work has already been finished. 工作已完成了。(结果是，现在不用做这项工作了)
2) 表示一个被动的动作或状态开始于过去，持续
到现在，并有可能持续下去，常与for或since引导
的时间状语连用，或用于How long...？句型中。例 如： The plan has been discussed for nearly 2 hours. 这项计划已被讨论了近两个小时了。
3． ─Have the cars been repaired？ ─No，they haven’t．
这些汽车修好了吗？ 不，还没有。
How long has her work been finished？ 她的工作完成有多久了？
2. 现在完成时被动语态的各种句式：
[肯定式] have/has＋been＋done Your computer has been repaired. 你的电脑已经修好了。
3．Over the past ten years，this town __________ (hit)twice by earthquakes.
答案：has been hit
4．—Will the lecture be held at 4 o’clock this
afternoon?
—No. It__________________(put off)till tomorrow afternoon. 答案：has been put off
答案：have been cut down
5．我喜欢这部科幻电影，它已经在电视上播了三 次了。 I like this science fiction film and it _____________ three times on TV. 答案：has been shown
Ⅱ. 单项填空 1．His sister left home in 1998，and _______since. A．had not been heard of B．has not been heard of C．had not heard of D．has not heard of 解析：选B。考查时态及语态。句意为：他姐姐 1998年离家出走，从此杳无音信。根据句中since可 知本题需用完成时，同时根据句意可知需用现在完 成时的被动语态。故选B项。
她的工作完成有多久了？
3. 现在完成时被动语态的主要用法
1) 表示过去发生的动作对现在造成的影响与结果。
当动词为短暂动词时，可与already或yet连用，但
不能与for或since引导的表示一段的时间状语连用。 例如： I’m sorry，but the letters haven’t been typed yet. 很抱歉，这些信件还没有被打印出来。(结果是，
3．这座城市明年将建多少座大楼？
How many high buildings ________________in
this city next year?
答案：will be built 4．为了多种一些谷物，很多树被砍掉了。 Large numbers of trees ______________to grow more grain.
---- Since 1990.
A. were you employed B. have you been employed C. had you been employed D. will you be employed
3. When and where to go for the on-salary holiday ____ yet. A. are not decided
4. I want to buy this kind of cloth because I_______ the cloth ________well. A．have told；washed B．have been told；washes C．have been told；washed D．was told；washed 解析：选B。根据句意“因为我被告知这种布很好 洗”可知第一空用完成时的被动语态；第二空表示 主语具有的属性，用主动表被动，故用washes。
[否定式] have/has＋not＋been＋done
The desks have not been cleaned. 这些桌子还没有擦干净。
[疑问式]Have/Has＋主语＋been＋done?
—Has the door been painted?
那扇门粉刷了吗？ —No，it hasn’t.不，还没有。 [特殊疑问式] 疑问词＋have／has＋主语＋been＋done How long has her work been finished？
3) 用在时间或条件状语从句中，表示将来某时已
完成的动作，即用现在完成时的被动语态代替将 来完成时的被动语态。 You can go home as soon as your task has been finished. 你的任务一完成就可以回家。
Task 2 Test yourself!
Ⅰ. 完成句子 1．由于大雪，高速公路已经被封闭。 The freeway _______________because of the heavy snow. 答案：has been closed 2．对不起，先生，这次展览的门票已经全部卖完 了。 Sorry，sir，all the tickets for the exhibition ________________. 答案：have been sold out
Unit 3 Computers
Period 4
语法专题课
Task1. Presentation
I. Read the sentences from the text, paying attention to the underlined parts. 1.Over time I have been changed quite a lot. 2. …, I have been used in offices and homes since the 1970s. 3. … I never forget anything I have been told! 4. Since the 1970s, many new applications have been found for me. 5. I have also been put into robots and used to make mobile phones as …