Unit 3 The Internet Discovering Useful Structures 课件- 高一上学期英语人教版（2019）必修第二册.pptx
Unit 3 The Internet,Grammar,主备人：韦苗苗 议课时间: 2月上课时间: 3月,学习目标(1),1. Identify and summarize the form and the functions of the present perfect passive voice;2. Compare the present perfect passive voice with the active, and change the active form into the passive form;3. Apply the present perfect passive voice into use,1. Much has been written about the wonders of the World Wide Web.,问题导学1(1),Observe and translate the following sentences, and try to find something in common from these sentences.,2. Peoples lives have been changed by online communities and social networks.,问题导学1(3),3. Many people have been helped by the club.,已经被书写,已经被改变,have/ has been done,已经被做,表示 “某人/某事/某物已经被”,已经被帮助,has been written,have been changed,have been helped,问题导学1(1),点拨精讲1(3),Observe and translate the following sentences, and find the differences among “have/has done” and “have/has been done”.,have/ has done,have/ has been done,主语和动作之间是主动关系,主语和动作之间是被动关系,1. A woman has started a small online company with two friends.,1. A small online company has been started by a woman with two friends.,2. The internet has made our lives more convenient.,2. Our lives has been made more convenient by the Internet.,已经开始,已经被开始,已经使,已经被使,has started,has been started,has made,has been made,即学即练,1. I have asked her to help you.,将下列主动句变为被动句,2. They have found a good place to build a library in the city.,3. We have planted many trees on the hill in the last two years.,She has been asked by me to help you.,A good place has been found by them to build a library in the city.,Many trees have been planted by us on the hill in the last two years.,问题导学2(4),The letter (post) already.,Observe the following sentences and try to fill in the blanks.,has been posted,Many houses (build) for the poor so far.,have been built,点拨精讲2(4),用法1:被动动作发生在过去,已经完成, 对现在造成影响 或产生结果。(already, yet, so far, by now),问题导学2(4),The machine (repair) for two hours but it still doesnt work.,has been repaired,Paper money (use) for over 50 years.,has been used,点拨精讲2(4),用法2:被动动作发生在过去,持续到现在,并有可能继续 持续下去。(for+一段时间; since),Everyone will feel extremely delighted if he_(admit) to South China Normal University.,You shouldnt leave school before your homework_(finish).,has been admitted,has been finished,用法3:在时间/条件状语从句中表示可能 还没有发生的被动动作。,点拨精讲2(10),1. The machine has been repaired already.2. The machine is being repaired now. 3. The machine was repaired yesterday.,说明动作发生在过去,对现在有影响, “现在修好了”,说明动作正在进行,只说明动作发生在过去,4. The baby has been taken good care of.4. The baby has been taken good care.,Attention: 在被动结构中, 动词短语的介词或副词不可去掉,5. Great changes have been taken place since 1978.5. Great changes have taken place since 1978.,Attention: 不及物动词或词组无被动,即学即练,1.More than 5000 used bikes (collect) since the two brothers set up the organization.,2. He (employ) at this job since 1990.,3. His novel (translate) into 25 languages.,have been collected,has been employed,has been translated,课堂小结(1),现在完成时的被动语态,含义,结构,表示过去发生的被动动作现在已经完 成或仍将持续, 强调对现在的影响,have/has been done,形式,肯定式,否定式,疑问式,have/has been done,have/has not been done,Have/Has+主语+been done?,特殊疑问词+have/has+主语+been done?,用法,表示已经完成的被动动作,表示开始于过去并可能持续下去的被动动作,在时间状从,条件状从中,表示还未发生的被动动作,注意事项,区分have/has been done/ be being done/ be done,不及物动词或词组无被动,当堂检测(15),Great changes1._(take) place in my hometown in the past few decades. The public facilities(设施) 2._(improve) so far. Many 3._(road) have been widen. Besides, More attention has been given to the 4._(environment) protection, so many trees and flowers 5._(plant) now. The water in the rivers as well as the air 6._(become) clean again. 7._ many people say, 8._ seems that we are now living in a “big park”. 9._, things can get bad if we dont appreciate 10._we have now.,have taken,have been improved,roads,environmental,are being planted,has become,As,It,However,what,
