Unit 3 Discovering Useful Structures（现在完成时被动语态）ppt课件-（2019）新人教版高中英语必修第二册(1).pptx

1、Unit 3The InternetDiscovering Useful Structures1. analyze the forms and features of the present perfect passive voice. 1. find out the differences in meaning and function between the active and passive forms.2. master the functions of the present perfect passive voice in the context and use it in re

2、al situations.Find all the sentences using “have/has done” or “have/has been done” on page 281. Much has been writeen about the wonders of the World Wide Web.2. There are countless articles telling us how the Internet has made our lives more convenient.3.But the Internet has done much more for peopl

3、e than simply make lfie more convenient.4.Peoples lives have been changed by online communities and social networks.5. Many people have been helped by the 6. Her company has become quite successful.7. Jan has started taking online classes tolearn more about how to use the Internet to make society be

4、tter.8.Jans life has been greatly improved by the Internet.Jans life has been greatly improved by the Internet. The Internet has greatly improved Janes life.Much has been written about the wonders of the World Wide Web. People have written much about the wonders of the World Wide Webhave/has donebe

5、donehas/have been done have/has doneactive active voicevoicepassive voice has been improvedhas improved has been written have writtenpresent(now)futurepast Present Perfect Tense 现在完成时现在完成时(book P30 T1)(book P30 T1)Verb formPassivePassiveActiveActive have/has + have/has + v-edv-edhave/has have/has be

6、enbeen + + v-edv-ed(1)主语主语 + have/ has + V-过去分词过去分词(done)助动词助动词,无无意义意义 一：现在完成时的一：现在完成时的结构结构Winter has already come(came,come)，will it still be far in spring ?注：主语若是注：主语若是第三人称单数第三人称单数助助动词用动词用 hasYou _have_ planted all the trees.I _have_ planted all the trees.He/she _has_ planted all the trees.They _h

7、ave_ planted all the trees. 练习：区别练习：区别have 和和 has的用法的用法 主语若是第三人称单数助主语若是第三人称单数助动词用动词用 has一、含义：1、表示动作发生在过去、表示动作发生在过去, 到现在到现在已经已经完成或对现在产生的影完成或对现在产生的影响响。2、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。二、构成：肯定式：肯定式：have/has been done否定式：否定式：have/has not been done一般疑问句：一般疑问句：Have/Has +主语主语+ been done?特殊疑问句：特殊疑问句：疑问词疑问词+

8、have/has +主语主语+been done?三、解题步骤1.找时找时 2.圈主圈主 3.定谓定谓Summary1. The problem has been discussed for 2 days.2. Many new buildings have been built in the past few years.3. Two novels have been written by him so far. 4. The computer has been used every day since I bought it.5. The dirty clothes have alread

9、y been cleaned.三、现在完成时被动语态用法三、现在完成时被动语态用法 （一）找出表示时间状语的词语并总结用法。（一）找出表示时间状语的词语并总结用法。表示一个被动的动作或状态表示一个被动的动作或状态从过从过去开去开始一始一直持直持续到现在续到现在，常连用的时间状语有：，常连用的时间状语有：for+段时间，段时间，since +时间状语时间状语(从句从句)，these days, so far, up to now, in the last/ past few years等等,总结如下总结如下. 常与现在完成时连用的时间状语：already 已经(肯定句) yet 已经（否定句或者

10、疑问句）recently/lately 最近 since then 从那时起ever since 自那以来 ever 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 years在过去的几年里（二）（二）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。即学即练： The bike_(not repair) yet. I _ already_(introduce) t

11、o 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。1.Great changes _(take) place in my hometown in the past ten years.has not been repaired havebeen introduced have taken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：

12、have/ has (not) been done。一.单句语法填空1Their new house _(decorate) for two months and they will settle in 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 _ (

13、take)place in my hometown in the past ten years.5. She _ (return) this book to the library already.has has been decoratedbeen decoratedhave have been advertisedbeen advertisedhave been selected have been selected have have takentakenhas returnedhas returned(P30 T2) Change the sentences into the pres

14、ent passive voice.Example: Theyve bulit 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 t

15、he 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 pressed the button yet to copy the file?5. Has anyo

16、ne 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? The Internet

17、 is bringing great changes to modern life. Complete the text with the correct forms of the words in brackets. The world_ (turn upside down)since the invention of the Internet and the introducton of personal computers into nearly every home. The twin inventions of the personal computer and the Intern

18、et_ (consider) to be among the two most important events of the last century. Shopping_ ( completely change). Rather than going out to stores weekly or even daily more and more people order things from clothes to toys to foods online and have them delivered directly to their homes. Social communicat

19、ion_ (take over) by the Internet In the past, letters, phone calls, and face-to-face meetings were necessary to build up relationships, but now online communication is often the only social interaction that some people have all day! Games, music, movies and so on_(heavily influence)by the Intemet. New kinds of crimes are happening on the Intemet, too, so cyber security has to be constantly updatedhas been turned upside downhave been considered has been completely changedhas been taken overhave been heavily influenced