Unit3 Discovering useful structures课件-2022-2023学年高中英语人教版（2019）必修第二册

UNIT 3 THE INTERNET Discovering useful structures The Internet is becoming the town square for the global village of tomorrow. -Bill Gates 现在完成时 have/has + v-ed 表示说话时已经完成的动作,而且这个动作的结果对现在仍有影响; 表示动作发生在过去,但一直持续到现在,并且有可能继续持续下去。 Do you know the structures and meanings of the present perfect tense and passive voice? 复习被动语态的构成:(五种时态的被动语态) 时态 主动态 被动态 一般现在时 一般过去时 一般将来时 现在完成时 现在进行时 am/is/are done do/does did was/were done will do will be done have/has done have/has been done am/is/are doing am/is/are being done 现在完成时的被动语态 Read the pairs of sentences. Underline and compare the different verb forms. Activity 1 Talk about something that has been done Jan’s 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 Jan’s life. People have written much about the wonders of the World Wide Web. How do we form the present perfect passive voice? Fill in the blank. have/has been + v -ed Change the sentences into the present perfect passive voice. They’ve built a kind of new PC with more functions. A kind of new PC has been built with more functions. n. 功能;作用 vi. 起作用;运转 主动语态变被动语态的原则 “三变” 原句主语 by的宾语 宾语 主语 谓语由主动 被动 Change the sentences into the present perfect passive voice. Activity 2 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 online database? → EXAMPLE They’ve built a kind of new PC with more functions. → A kind of new PC has been built with more functions. 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? (1)主语 + have/ has + V-过去分词(done) 助动词,无意义 一:现在完成时的结构 Winter has already come(came,come), will it still b