河北省泊頭市聞知高級中學(xué)新人教（2019）必修二Unit3 The Internet DiscoveringUseful Structures(19張ppt)

1、Unit 3The InternetDiscovering Useful StructuresTeaching objectives:analyze the forms and features of the present perfect passive voice. find out the differences in meaning and function between the active and passive forms.master the functions of the present perfect passive voice in the context and u

2、se it in real 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 mor

3、e for people 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

4、 society better.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 Web Read

5、 the pairs of sentences. Underline and compare the different verb forms.have/has donebe donehas/have been done have/has doneactive voicepassive voice has been improvedhas improved has been written have written1.The Present Perfect tense(現(xiàn)在完成時)present(now)futurepast Present Perfect Tense 現(xiàn)在完成時(book P

6、30 T1)Verb formPassiveActivehave/has + v-edhave/has been + v-ed(1)主語 + have/ has + V-過去分詞(done)助動詞,無意義 一：現(xiàn)在完成時的結(jié)構(gòu)Winter has already come(came,come)，will it still be far in spring ?注：主語若是第三人稱單數(shù)助動詞用 hasYou _have_ planted all the trees.I _have_ planted all the trees.He/she _has_ planted all the trees.T

7、hey _have_ planted all the trees. 練習(xí)：區(qū)別have 和 has的用法 主語若是第三人稱單數(shù)助動詞用 has一、含義：1、表示動作發(fā)生在過去, 到現(xiàn)在已經(jīng)完成或?qū)ΜF(xiàn)在產(chǎn)生的影響。2、動詞和被修飾主語構(gòu)成被動關(guān)系。二、構(gòu)成：肯定式：have/has been done否定式：have/has not been done一般疑問句：Have/Has +主語+ been done?特殊疑問句：疑問詞+have/has +主語+been done?三、解題步驟1.找時 2.圈主 3.定謂Summary1. The problem has been discussed

8、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 already been cleaned.三、現(xiàn)在完成時被動語態(tài)用法 （一）找出表示時間狀語的詞語并總結(jié)用法。表示一個被動的動作或狀態(tài)從過去開始一直持續(xù)到現(xiàn)在，常連用的時間狀語有：for+段時間，s

9、ince +時間狀語(從句)，these days, so far, up to now, in the last/ past few years等,總結(jié)如下. 常與現(xiàn)在完成時連用的時間狀語：already 已經(jīng)(肯定句) yet 已經(jīng)（否定句或者疑問句）recently/lately 最近 since then 從那時起ever since 自那以來 ever 曾經(jīng)so far 迄今為止 for a long time 很長一段時間by now 到現(xiàn)在為止 in recent years 在最近幾年里in/during/over the past/last years在過去的幾年里（二）表某

10、被動動作對現(xiàn)在造成的影響或結(jié)果，常與already, yet, just, ever, never, recently等連用。即學(xué)即練： The bike_(not repair) yet. I _ already_(introduce) to Mr. Smith.注意：有些動詞沒有被動語態(tài), 如不及物動詞happen, take place, break out等。Great changes _(take) place in my hometown in the past ten years.has not been repaired havebeen introduced have tak

11、en現(xiàn)在完成時被動語態(tài)的解題步驟1.找時：找與現(xiàn)在完成相對應(yīng)的時間狀語；2.圈主：主語與動詞構(gòu)成被動關(guān)系；3.定謂：確定謂動形式：have/ has (not) been done。一.單句語法填空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 peop

12、le 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 been decoratedhave been advertisedhave been selected have takenhas returned(P30 T2) Change the sentences into the present passive vo

13、ice.Example: Theyve bulit a kind of new PC with more functions. A kind of new PC has been built with more functions.I have downloaded the software to help my phone battery last longer.Someone has lost an identity card.Have you confirmed the Wi-Fi password?Have you pressed the button yet to copy the

14、file?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 anyone made a comment about the o

15、nline 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 is bringing great changes to

16、 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 Internet_ (consider) to be among th

17、e 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 communication_ (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, mus