U3 Period 3. Discovering Useful Structuresppt课件 -（2019）新人教版高中英语高一必修第二册.ppt

1、Discovering Useful Structures-present perfect active voice-present perfect passive voiceUnit 3 The InternetFind 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 th

2、e Internet has made our lives more convenient.3.But the Internet has done much more 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 club.6. Her company has become quite successful.7. J

3、an has started taking online classes tolearn more about how to use the Internet to make society better.8.Jans life has been greatly improved by the Internet.1. Her company has become quite successful.2. There are countless articles telling us how the Internet has made our lives more convenient.3.But

4、 the Internet has done much more for people than simply make lfie more convenient.4.Jan has started taking online classes tolearn more about how to use the Internet to make society better.5. Many people have been helped by the club.6. Much has been writeen about the wonders of the World Wide Web.7.

5、Peoples lives have been changed by online communities and social networks.8.Jans life has been greatly improved by the Internet.现在完成时( The Present Perfect Tense)是过去的动作或状态持续到现在并且已经完成，对现在造成的影响，可能持续发生下去。在英语时态中，时指动作发生的时间，态指动作的样子和状态。构成:主语+助动词(have/has) +动词的过去分词:(have/has been/ done)肯定句:主语+have/has+done(p

6、.p)(V-ed).否定句:主语+have/has not (havent/hasnt) +done(p.p)(V-ed).一般疑问句:Have/Has+主语+done(p.p)(V-ed).?肯定回答:Yes,I/they/we/you have.或Yes,she/he/人名 has.否定回答:No,I/they/we/you havent.或No，she/he/人名 hasnt.特殊疑问句:特殊疑问词+一般疑问句(have/has+主语+过去分词+其他)现在完成时的被动语态主动语态表示主语为动作的执行者；被动语态表示主语为动作的承受者。现在完成时的被动语态强调过去的动作对现在造成的影响或结

7、果主语为动作的承受者，表示“已经被”现在完成时的被动语态的肯定式为:have/ has +been +doneThe experiment has been done successfully. 现在完成时的被动语态的否定式为:have/ has +not +been +doneToms novel has not been published.现在完成时的被动语态的一般疑问句have /has提到主语的前面Has his bike been repaired? 现在完成时的被动语态的特殊疑问句为:疑问词+have /has +been +done? Who has been invited?

8、1、用于不知道动作执行者是谁时 His bike has been stolen. （不清楚是被谁偷的）2、用于动作执行者是泛指或不言自明时Not a book in the library has been taken away. （没人拿书，泛指）3、用于可以说出动作执行者但动作承受者是谈话中心或特别需要强调时 My watch has been repaired. （表修好了是谈话的主旨，是谁修好无关紧要。不必提及）4、用于出于委婉、礼貌而避免提及自己或对方时Enough has been said here on this question. （意思是说：大家不要再说了）5、用于文章标

9、题、广告、新闻等中（常用省略助动词be的被动语态）Road Blocked. 道路已被堵塞（新闻报道，省略了助动词has been）6、用于动作的执行者不是人时 The house has been washed away by the storm. 那栋房子已被暴风雨冲走了。7、用于商务书信中书信起草人是以公司名义时 Your letter has been received. 来信已收到。1. The softeware has been downloaded to help my phone battery last longer.2. An identity card has been

10、 lost.3. Has the Wi-Fi password been confirmed4. Has the button been pressed yet to copy the file?5. Has a/any comment been made about the online database? The Internet is bringing great changes to modern life. Complete the text with the correct forms of the words in brackets. The world_ (turn upsid

11、e 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 the two most important events of the last century. Shopping_ ( completely change). Rather than going out

12、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 relationshi

13、ps, 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

14、been considered has been completely changedhas been taken overhave been heavily influencedLook at the way the piture has been paintedListen to the way the song has been writtenLook at the way the film has been madeNow think about what you could create.Look at the way the needy have been helpedLook at the way the river has been cleanedLook at the way the tree has been planedNow think how tmake the world a better place