Unit 3 Discovering Useful Structures 教学（ppt课件）(001)-2022新人教版（2019）《高中英语》必修第二册.pptx

1、Unit 3 The InternetSection B Discovering Useful StructuresCONTENTSLeading-inWhile-classAfter-classPart 1Part 1Part 2Part 2Part 3Part 3Part.1Leading-inLeading in1.Jans life has been greatly improved by the Internet.The Internet has greatly improved Jans life.2.Much has been written about the wonders

2、of the World Wide Web.People have written much about the wonders of the World Wide Web.Underline and compare the different verb forms.Leading inActive _Passive _The form of the present perfect passive voiceVerb formhave/has+v-ed have/has been+v-edPart.2While-class现在完成时的被动语态现在完成时的被动语态1 构成构成肯定式：have/h

3、as+been done否定式：have/has not+been done一般疑问式：Have/Has+主语+been done?特殊疑问式：疑问词+have/has（+主语）+been done?A lot of factories have been set up since last year.自从去年以来，已经建立了许多工厂。I cant see any coffee in this cupboard.Has it all been finished?我看不见这碗柜里有咖啡。都喝完了吗？2 用法（1）表示一个被动的动作在说话之前已完成，强调过去的动作对现在造成的影响或结果，通常与 a

4、lready，yet，just，never，recently 等副词连用。I got caught in the rain and my suit has been ruined.我被雨淋了，衣服全毁了。His brother has been fired by the company recently.他弟弟最近被公司解雇了。（2）表示一个被动的动作或状态从过去开始一直持续到现在，常与for 或 since 引出的时间状语连用，或用于 how long 引出的句子中。A great many machines have already been produced by the factory

5、 since the technological revolution.自从技术革命以来，这家工厂已经生产了许多机器。（3）用在时间或条件状语从句中，表示将来已完成的被动动作，即用现在完成时的被动语态代替将来完成时的被动语态。She will leave for the cinema as soon as the application form has been completed.申请表一填好，她就去看电影。【学法点拨】常与现在完成时连用的时间状语：already 已经 yet 已经recently/lately 最近 since then 从那时起ever since 自那以来 ever

6、 曾经so far 迄今为止 for a long time 很长一段时间by now 到现在为止 in recent years 在最近几年里in/during/over the past/last few years 在过去的几年里Their new cars have been advertised on the Internet for a long time.他们的新车在网上做广告已经很长时间了。3 注意事项（1）与一般过去时的被动语态的区别（2）borrow，begin，start，buy，marry，open，join 等非延续性动词的现在完成时的被动语态不能与表示一段时间的状语

7、连用。若要表达相应的意思，需要改变动词或时态。这本书借了一周了。The book has been borrowed for a week.（）The book has been kept for a week.（）这个工程已经开始多久了？How long has this project been started?（）How long ago was this project started?（）【学法点拨】非延续性动词的否定式可表示动作的持续过程，具有持续性，因而可与 since 或 for 引出的时间状语连用。（3）带有双宾语的动词，如 give，send，bring，take，teac

8、h，show，tell，make，sing，write，sell，buy，lend，offer，hand，pass，get 等，变为被动语态时，一般是把指人的间接宾语变为主语。如果将直接宾语变为被动句的主语，间接宾语前要加 to 或 for。We have been told the time of the lecture.我们已被告知讲座的时间。The traffic rules have been taught to him many times，but he still ignored them.交通规则已经教过他很多次了，但他仍然无视。（4）带有复合宾语（宾语+宾语补足语）的动词变为被

9、动语态时，只能将宾语变为主语，原来的宾语补足语保持不动。主动语态中不带 to的不定式作宾补，在被动语态中要加上 to。The workers have been made to work a whole day without stop.工人们被迫不停地干了一整天。（5）短语动词变为被动语态时，要注意保持短语动词的完整性，不可漏掉动词后面原有的介词或副词。此类短语动词有：动词+介词refer to，look after，call on，rely on，look for，look at，listen to，dream of，meet with，laugh at，result in，wait fo

10、r，deal with，operate onThese cases have been referred to in the experts report.专家的报告中提到了这些案例。动词+名词+介词pay attention to，make use of，take part in，keep an eye on，make fun of，catch sight of，take a note of，take care ofThe poor boy has been made fun of in the public for many times.这个可怜的男孩在公共场合被取笑了很多次。动词+副词t

11、urn on，turn off，carry on，carry out，think over，make up，set up，put down，hand in，point out，call upSeveral specialized hospitals have been set up to help cure the patients of the terrible disease.已经建立了几家专科医院来帮助治疗这种可怕疾病的病人。While-classPracticeChange the sentences into the present perfect passive voice.Exa

12、mpleThey have built a kind of new PC with more functions.A kind of new PC has been built with more functions.1.I have downloaded the software to help my phone battery last longer.2.Someone has lost an identity card.3.Have you confirmed the Wi-Fi password?4.Have you pressed the button yet to copy the

13、 file?5.Has anyone made a comment about the online database?While-class1.I have downloaded the software to help my phone battery last longer.2.Someone has lost an identity card.3.Have you confirmed the Wi-Fi password?4.Have you pressed the button yet to copy the file?5.Has anyone made a comment abou

14、t the online database?The software has been downloaded to help my phone battery last longer.An identity card has been lost.Has the Wi-Fi password been confirmed?Has the button been pressed yet to copy the file?Has a/any comment been made about the online database?Part.3After-classAfter-class What ar

15、e the differences in meaning and function between the active and passive forms?The object in an active sentence becomes the subject in a passive sentence.Both sentence types convey a similar meaning,but they are slightly different.Active sentences are used often,as they are more direct.Passive sentences are often used when the doer of an action is unknown,not important,or preferred not named.Thank you！