Unit 3 Discovering Useful Structures 语法（ppt课件） -2023新人教版（2019）《高中英语》必修第二册.pptx

1、Unit 3 The InternetSection B Discovering Useful Structures1.Analyze the forms and features of the present perfect passive voice.2.Find out the differences in meaning and function between the active and passive forms.3.Master the functions of the present perfect passive voice in the context and use i

2、t in real situations.Leading inActive _Passive _The form of the present perfect passive voiceVerb formhave/has+v-ed have/has been+v-edTalk about something that has been done现在完成时的被动语态现在完成时的被动语态Read the pairs of sentences.Underline and compare the different verb forms.Jans life has been greatly impro

3、ved by the Internet.Much has been written about the wonders of the World Wide Web.The Internet has greatly improved Jans life.People have written much about the wonders of the World Wide Web.Task 1:How do we form the present perfect passive voice?Fill in the blank.Verb formActive have/has+v-edPassiv

4、ehave/has been+v-edRead and compareThe students have cleaned the classroom.The classroom has been cleaned.You neednt clean it now.现在完成时现在完成时activepassive表示说话时已经完成的被动性的动作或结果，主语是动作的承受者表示说话时已经完成的被动性的动作或结果，主语是动作的承受者。现在完成时的被动语态现在完成时的被动语态have/has+v-edhave/has+been+v-ed现在完成时现在完成时被动语态被动语态have/has been done现

5、在完成时的被动语态现在完成时的被动语态be donehave/has beenHow do we form the present perfect passive voice?现在完成时的现在完成时的被动被动语态语态Part.2While-classChange 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.n.功能；作用vi.起作用

6、；运转主动语态变被动语态的原则主动语态变被动语态的原则“三变三变”原句原句主语主语 by的的宾语宾语宾语宾语 主语主语 谓语谓语由主动由主动 被动被动The letter (post)already.has been postedMany houses (build)for the poor so far.have been built用法用法1:被动动作发生在过去被动动作发生在过去,已经完成已经完成,对现在造成影响或产对现在造成影响或产生结果。生结果。(already,yet,so far,by now,until now)现在完成时的被动语态的用法现在完成时的被动语态的用法一、现在完成时的

7、被动语态的常用句式一、现在完成时的被动语态的常用句式肯定式肯定式主语主语have/has been done.否定式否定式主语主语have/has not been done.一般疑问式一般疑问式Have/Has主语主语been done.？特殊疑问式特殊疑问式疑问词疑问词have/has主语主语been done.？Has his bike been repaired?他的自行车修好了吗？他的自行车修好了吗？How many residents have been invited to the conference？有多少居民受到了参会邀请？有多少居民受到了参会邀请？Key points:请

8、认准以下常与现在完成时连用的时间状语请认准以下常与现在完成时连用的时间状语1.已经已经（常用在肯定句）（常用在肯定句）_2.已经已经 （疑问、否定句）（疑问、否定句）_3.最近最近 _4.从那时起从那时起 _5.自那以来自那以来_6.曾经曾经 _7.迄今为止迄今为止_8.到现在为止到现在为止_9.很长一段时间很长一段时间_10.在最近几年里在最近几年里_11.在过去的几年里在过去的几年里_12.在过去的三十年里在过去的三十年里_alreadyrecently/latelysince thenyetever sinceever 常用常用“have ever”so far；up to nowby

9、nowfor a long(period of)timein recent yearsin/during/over the past yearsin/during/over the three decades 判断正误:*He has died for 3 years.（）*He died 3 years ago.（）VX判断正误:*The patient has been taken good care.（）*The patient has been taken good care of.（）VX注意事项注意事项1.不及物动词和不及物动词短语不及物动词和不及物动词短语，没有被动语态，如：，没

10、有被动语态，如：rise,happen,take place,break out,come about,survive,remaind,last,die,disappear,end,fail,belong to,consist of.Eg：Great changes have taken place in my hometown recently.Eg:After the traffic accident,no one survived except a person who was badly injured.注意事项注意事项2.一般说来，只有及物动词才有被动语态，一般说来，只有及物动词才有

11、被动语态，但许多但许多“不及物动词不及物动词+副词副词或介词或介词”构成的短语动词构成的短语动词，相当于及物动词，也可以有被动语态，但变，相当于及物动词，也可以有被动语态，但变被动语态后，不可把介词或副词漏掉被动语态后，不可把介词或副词漏掉,eg:laugh at,operate on,listen to,look after,take care of,think of,talk about,hand in,catch sight of,make use of,pay attention to,turn onEg.:My sister will be taken care of by gran

12、dma.The patient is being operated on now.练：练：He turned on the radio just now.The radio was turned on by him just now.现在完成时被动语态的解题步骤现在完成时被动语态的解题步骤1.找时找时：找与现在完成相对应的时间状语：找与现在完成相对应的时间状语；2.圈圈主主：主语与动词构成被动关系：主语与动词构成被动关系；3.定定谓谓：确定谓动形式：确定谓动形式：have/has(not)been done。Exercises1.First as a PC and then as a lapt

13、op,I_(use)in offices and homes since the 1970s.2.Over time my memory _(develop)so much that I never forget anything I _(told).3.Since the 1970s many new applications _(find)for me.4.I have also _(put)into robots and used to make mobile phones as well as_(help)with medical operations.has developedhav

14、e been told have been used have been foundbeen puthelp5.They have interviewed several applicants for the job.6.They have carried out several experiments to test the performance of the new car.7.They havent given any permission to enter the lab since it was closed.Several experiments have been carrie

15、d out to test the performance of the new car.Not any permission has been given to them to enter the lab since it was closed.Several applicants for the job have been interviewed.After-class What are the differences in meaning and function between the active and passive forms?The object in an active s

16、entence 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.Have a tr

17、y(Book p.30(2)Change the sentences into the present perfect passive voice.ExampleThey 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 y

18、ou 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?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 presse

19、d the button yet to copy the file?5.Has anyone made a comment about 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?1.Review grammar.2.Read the text on page 28 again and underline all sentences of the present perfect and present perfect passive voice.