Unit 3 Discovering Useful Structures 现在完成时被动语态（ppt课件）(4)-2023新人教版（2019）《高中英语》必修第二册.pptx

1、Unit 3 The InternetDiscovering Useful StructuresTo 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 poem现在完成时用法：用法：1.表示发生在过去且已经完成的动作对现在造成的影响或结果表示发生在过去且已经完成的动作对现在造成的影响或

2、结果 2.表示动作从过去延续到现在并有可能继续延续下去表示动作从过去延续到现在并有可能继续延续下去基本结构：主语基本结构：主语+have/has+done+其他其他The countryside has changed a lot in the past few years.We have seen that film before.之前我们已经看过那部电影了。之前我们已经看过那部电影了。现在现在过去过去将来将来Read the pairs of sentences.Underline and compare the different verb forms.Jans life has bee

3、n 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.现在完成时与现在完成时被动语态的动词形式现在完成时与现在完成时被动语态的动词形式找出找出下面句子的下面句子的谓语谓语结构，哪些是结构，哪些是主动主动？哪些是？哪些是被动被动？1.Jans

4、life has been greatly improved by the Internet.2.The Internet has greatly improved Jans life.3.People have written much about the wonders of the World Wide Web.4.Much has been written about the wonders of the World Wide Web.被动被动主动主动主动主动被动被动 现在完成时现在完成时谓语谓语结构结构 主动主动被动被动have/has donehave/has been done.

5、已经被已经被.主语主语+have/has+V-过去分词过去分词(done)助动词助动词,无意义无意义 一一、现在完成时的结构现在完成时的结构Winter has already come.一、用法：1、表示发生在过去,到现在已经完成的动作对现在的影响。表示动作从过去延续到现在并有可能继表示动作从过去延续到现在并有可能继续延续下去续延续下去2、动词和被修饰主语构成被动关系。二、构成：肯定式：have/has been done否定式：have/has not been done一般疑问句：Have/Has+主语+been done?特殊疑问句：疑问词+have/has+主语+been done?

6、三、解题步骤 1.根据句意确定时态 2.确定主被动 3.定谓have/has现在完成时的被动语态有两种情况：1)表过去开始的被动动作一直持续到现在，常连用的时间状语有：for+段时间，since+时间状语(从句)，these days,so far,up to now,in the last/past few years等。eg This class have been taught by Mr.Brown for two years.His Chinese has been improved a lot since he came to China.Rowlings novels have

7、been translated into many foreign languages so far.2)表某被动动作对现在造成的影响或结果，常与already,yet,just,ever,never,recently等连用。eg The bike has not been repaired yet.I have already been introduced to Mr.Smith.注意：有些动词没有被动语态,如不及物动词happen,take place,break out等。【考点精讲】【考点精讲】现在完成时现在完成时1.常与以下时间状语连用：常与以下时间状语连用：recently,ye

8、t,already,just,before,lately,since+时间状语（从句）时间状语（从句）”,“for+时间段时间段”,(ever)since,these days,before,so far,in the last/past few years,up to now,till now，by+现在时间现在时间等。等。*I have just/alreay turned off the light.*They have been good friends since they met at a meeting.*She has worked in the school for ten

9、years.2.在条件、时间、让步状语从句中在条件、时间、让步状语从句中,表示将来某时已完表示将来某时已完成的动作。成的动作。*I shall post the letter as soon as I have written it.3.下列句型中常用现在完成时下列句型中常用现在完成时:It is(has been)+一段时间一段时间+since从句从句(从句用一般过去从句用一般过去时时)This/It is the first(second.)time+that从句从句(从句用从句用现现在完成时在完成时)3.3.注意事项注意事项由由finish,buy,start,begin,post,re

10、turn,borrow,marry,open等词构成的现在完成时的被动语态等词构成的现在完成时的被动语态,不能与不能与表示段时间的状语，如表示段时间的状语，如for four days,how long等连用，等连用，而要改换动词或者是时态。而要改换动词或者是时态。判断正误判断正误:*How long has this book been bought?()*How long ago was this book bought?()短语动词不能分割，而且不能省略短语动词中的介短语动词不能分割，而且不能省略短语动词中的介词或副词。词或副词。判断正误判断正误:*The patient has bee

11、n taken good care.()*The patient has been taken good care of.()XVXV 并不是所有的动词都有被动语态。如并不是所有的动词都有被动语态。如happen,occur,take place,break out,belong to,cost,last 等不及物动词等不及物动词或词组，就没有被动语态。或词组，就没有被动语态。判断正误判断正误:*Some of the best conversations have ever happened around the dinner table.()*Some of the best conver

12、sations happened around the dinner table.()双宾语动词变被动语态可将其中的一个宾语变为主双宾语动词变被动语态可将其中的一个宾语变为主语语,另一个保留不动。另一个保留不动。主动主动:I have given him the key.被动被动:He has been given the key.被动被动:The key has been given(to)him.VXWhile-classPracticeChange the sentences into the present perfect passive voice.ExampleThey have

13、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 file?5.Has an

14、yone 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 about the online d

15、atabase?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?Practice I the buildings,destroy,earthquake The bu

16、ildings have been destroyed by the earthquake.Look at the pictures,first list some key words,then make up sentences using the present perfect passive voice.machinereplacecomputerThe machine has been replaced by the computer.一.单句语法填空 1Their new house _ (decorate)for two months and they will settle in

17、 it in the near future.2Their new cars _ (advertise)on the Internet for a long time.3All the athletes _ (select)from millions of people all over the country in the past two months.4Great changes _ (take)place in my hometown in the past ten years.5.She _ (return)this book to the library already.has b

18、een decoratedhave been advertisedhave been selected have takenhas returned 二、单选题()1.Despite the previous rounds of talks，no agreement _so far by the two sides.Ahas been reached Bwas reached Cwill reach Dwill have reached()2.It is the most instructive lecture that I _ since I came to this school.Aatt

19、ended Bhave been attended Cam attending Dhave attended()3.In the last few years thousands of films _all over the word.Ahave producedBhave been produced Care producing Dare being producedADBSUMMMARY现在现在完成完成时的时的被动被动语态语态含义含义结构结构表示过去发生的被动动作现在已经完表示过去发生的被动动作现在已经完 成或仍将持续成或仍将持续,强调对现在的影响强调对现在的影响have/has been

20、 done形式形式肯定式肯定式否定式否定式疑问式疑问式have/has been donehave/has not been doneHave/Has+主语+been done?特殊疑问词+have/has+主语+been done?用法用法表示已经完成的被动动作表示已经完成的被动动作表示表示过去开始的被动动作一直持续到现在过去开始的被动动作一直持续到现在表表示示某某被动动作对现在造成的影响或结果被动动作对现在造成的影响或结果注意注意事项事项动词短语不可分割也不可省略其中的介词和副词动词短语不可分割也不可省略其中的介词和副词不及物动词或词组无被动不及物动词或词组无被动Thanks For Listening