Unit+3+Discovering+Useful+Structures+课件【备课精研+知识精讲】 高中英语人教版（2019）必修第二册

Unit 3The InternetPeriod 3Discovering Useful StructuresNew wordsbatteryWi-FiNew wordsbuttonfileTheyve built a kind of new PC with more functions.New wordsNew wordsHave you confirmed the Wi-Fi password?confirm sb in sthNew wordsHave you pressed the button yet to copy the file?pressure n.1.Before use,the _ must be charged.2.We have developed a new type of software with many _(function).3.I called the airport _(confirm)my flight reservation a week before I left for Beijing.4.In recent years，stress has been regarded as a cause of a whole range of medical problems，from high blood _(press)to mental illness.2016上海卷5.I selected a _(文件)and _(按)the delete key.batteryfunctions to confirmpressurefilepressedLets learnRead the pairs of sentences.Underline and compare the different verb forms.Jans life has been greatly improved 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.How do we form the present perfect passive voice?Fill the blank.Lets learnVerb formActivePassivehave/has+v-ed_have/has been+v-edChange the sentences into the present perfect passive voice.EXAMPLETheyve 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 you confirmed the Wi-Fi password?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?4.Have you pressed the button yet to copy the file?5.Has anyone made a comment about the online database?Has the button been pressed yet to copy the file?Has a/any comment been made about the online database?Find out the differences in meaning and function between the active and passive forms.The object in an active sentence 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.the present perfect passive voiceWe use it when something has been done by someone at sometime up to now.We are not interested in the actor/doer(行动者).Subject and its verb should be in a agreement.“及物动词+副词”“及物动词+介词”以及“及物动词+副词+介词”构成的短语动词可用于被动结构。许多“不及物动词+介词”以及“不及物动词+副词+介词”构成的短语动词相当于及物动词，也可以有宾语，也可用于被动结构。Complete the notice with the correct forms of the verbs in brackets.Dear Parents,We hope you will welcome this news.Almost 100 computers _(give)to us by a local computer company since the end of last year.A decision _(make)to begin a computer teaching experiment at our school.We _(help)in our teaching by a lot of information from the Internet.Also,a new computer room _(set up)in our school.We hope you will be happy with this exciting new development in our school.No.8 Senior High School