Unit3 The Internet Discovering Useful Structures（ppt课件） -2023新人教版（2019）《高中英语》必修第二册.pptx

1、Talk about something that has been doneTo learn the present perfect passive voiceTo use the present perfect passive voice to do some exercises and talk about something has been doneTo read a poem and learn to write your own poemRead the pairs of sentences.Underline and compare the different verb for

2、ms.Jans life has been greatly improved by the Internet.The Internet has greatly improved Jans life.Much has been written about the wonders of the World Wide Web.People have written much about the wonders of the World Wide Web.Complete the sentences according to the text.Much _(write)about the wonder

3、s of the World Wide Web.Peoples lives _(change)by online communities and social networks.Many people _(help)by the club.Jans life _(improve)greatly by the Internet.have been changedhave been helpedhas been improvedhas been written Verb formActivePassiveHow do we form the present perfect passive voic

4、e?Fill in the blank.have/has+v.-ed_have/has+been+v.-edWe use the passive voice in the present perfect tense to talk about something that has been done.The verb form is“(2)_”.has/have been doneThe Internet has greatly improved Jans life.(Active voice)Jans life has been greatly improved by the Interne

5、t.(Passive voice)Observe sentences and figure out the steps to change the active voice into passive voice.Step 1Move the object to the beginning of the sentence.Step 2Change the active form of the verb into passive form,maintaining the tense of the sentence.Step 3Add the preposition“by”before the or

6、iginal subject,if you want to mention it.Remember it can be omitted.Change the sentences into the present perfect passive voice.Theyve 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.

7、The software has been downloaded 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 about the online database?An identity card has been lost.Has the Wi-Fi pass

8、word been confirmed?Has the button been pressed yet to copy the file?Has a/any comment been made about the online database?Find out the differences in meaning and function between the active and passive forms.In an active sentence,the subject is doing an action to an object;they are used often,as th

9、ey are more direct.In a passive sentence,the subject is having sth.done to it,and the doer of that action is not necessarily mentioned.They are often used when the doer of an action is unknown,not important,or preferred not named.现在完成时的被动语态现在完成时的被动语态表示动作发生在过去表示动作发生在过去,到到现在已经完成或对现在产生的影响现在已经完成或对现在产生的影

10、响。动词和被修饰主语构成被动关系动词和被修饰主语构成被动关系。肯定式肯定式 have/has+been+v.-ed否定式否定式 have/has+not+been+v.-ed一般疑问句一般疑问句 Have/Has+主语主语+been+v.-ed?特殊疑问句特殊疑问句 疑问词疑问词+have/has+been+v.-ed?1.表示一个表示一个被动的动作在说话之前已完成，强调过去的动作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对现在造成的影响或结果。常与。常与already,yet,just,ever,never,recently等副词连用。等副词连用。e.g.The car

11、pet looks nice.It has already been cleaned.The result of their experiments hasnt been published yet.Have you ever been bitten by a dog?用法用法2)表示一个表示一个被动的动作或状态从过去开始一直持续到现在，被动的动作或状态从过去开始一直持续到现在，常常与与“for+一段时间一段时间”,“since+从句从句”,so far等状语连用等状语连用。e.g.The house has been used for many years.The party has bee

12、n planned since he came to China.Her novels have been translated into many foreign languages so far.【拓展拓展】在在时间、条件状语从句中时间、条件状语从句中，通常要，通常要用现在完成时的被动语用现在完成时的被动语态代替将来完成时的被动语态态代替将来完成时的被动语态。e.g.I will go to play football as soon as the homework has been finished.If a plan has been made,we should put it int

13、o practice.注意事项注意事项 1.borrow,begin,start,buy,marry,open,join等等非延续性动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词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连用。若要表达相应的意思，需要改变动词或时态。若要表达相应的意思，需要改变动词或时态。e.g.这本书借了一周了。这本书借了一周了。The book has been kept for a week.这个工程已经开始多久了？这个工程已经开始多久了？How long ago was this project started?(V)2.带有双宾语的动词带有双宾

14、语的动词，如，如give,send,bring,take,teach,show,tell,make,sing,write,sell,buy,lend,offer,hand,pass,get等，等，变为被动语态时，一般是把指人的间接宾语变为主变为被动语态时，一般是把指人的间接宾语变为主语语。如果。如果将直接宾语变为被动句的主语，间接宾语前要将直接宾语变为被动句的主语，间接宾语前要加加to或或for。e.g.We have been told the time of the lecture.The traffic rules have been taught to him many times,b

15、ut he still ignored them.3.带有复合宾语带有复合宾语(宾语宾语+宾语补足语宾语补足语)的动词变为被动语态的动词变为被动语态时，时，只能只能将宾语变为主语将宾语变为主语，原来的宾语补足语保特不动原来的宾语补足语保特不动。主动主动语态中不带语态中不带to的不定式的不定式作宾补，作宾补，在被动语态中要加上在被动语态中要加上to。e.g.The workers have been made to work a whole day without stop.4.短语动词变为被动语态时短语动词变为被动语态时，要注意保持短语动词的完整性，要注意保持短语动词的完整性，不可漏掉动词后面

16、原有的介词或副词不可漏掉动词后面原有的介词或副词。e.g.These cases have been referred to in the experts report.选用括号内合适的内容完成下面短文。选用括号内合适的内容完成下面短文。The Internet 1._(has considered,has been considered)as one of the most important inventions in the history of mankind(人类人类)and Internet Explorer 2._ _(has used,has been used)for 25

17、years allowing us to access such an important invention.But after all these years,it 3._(has decided,has been decided)that Microsofts apps and services will stop supporting Internet Explorer 11.has been decidedhas been considered used has been Read the poem and underline the present perfect passive

18、voice in the following poem.Look at the way your face has been washedLook at the way your teeth have been brushedLook at the way your shoes have been cleanedYoud better do them again.Look at the way the flowers have been plantedLook at the way the grass has been cutLook at the way the paths have bee

19、n sweptI hope that youll come here again.Read the poem again.Then think of your own situation and write a similar one.Look at the way _Listen to the way _Look at the way _the picture has been paintedthe song has been writtenthe film has been madeNow think about what you could create.Look at the way _Look at the way _Look at the way _the needy have been helpedthe river has been cleanedthe trees have been plantedNow think how to make the world a better place.1.Review Grammar.2.Finish the exercises on P74-75 in the workbook.3.Preview Listening and Talking.