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课件网) Unit 3 The Internet Period 3 Discovering Useful Structures What is present perfect tense present(now) future past 现在完成时 have/has done（过去分词） 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。 I have lived in China for 5 years. 我在中国住了5年。（从5年前到现在，现在还在中国） I lived in China for 5 years. 我在中国住了5年。（过去住在中国，现在不在中国） 过去的动作一直持续到现在 过去的动作对现在产生影响 Someone has broken the window. (窗户现在是坏的) I have already lost the key. (我现在没有钥匙) I haven't read the book yet. (不了解书的内容) 1) 表过去开始的被动动作一直持续到现在，常连用的时间状语有：for+段时间，since+时间状语(从句)，these days, so far, up to now, in the last/ past few years等。 eg This class have been taught by Mr. Brown for two years. His Chinese has been improved a lot since he came to China. Rowling’s novels have been translated into many foreign languages so far. 2) 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。 eg The bike has not been repaired yet. I have already been introduced to 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。 现在完成时： have/has done 1.过去的动作一直持续到现在 I have lived in China for 5 years. 我在中国住了5年。（从5年前到现在，现在还在中国） 2.过去的动作对现在产生影响 Someone has broken the window. (窗户现在是坏的) I have already lost the key. (我现在没有钥匙) I haven't read the book yet. (不了解书的内容) Look at the sentences, pay attention to the red part. 1.Over time I have been changed a lot. 2.The party has been planned since the new year. 现在完成时被动语态：have /has been +done 肯定式： have/has been done... 否定式： have/has not been done... 一般问句： Have/Has+主语+been done 特殊疑问句： 疑问词+have/has+主语+been done 现在完成被动语态的基本结构 The singer has been invited (by Tom) . The singer has not been invited (by Tom) . Has the singer been invited (by Tom) Who has been invited (by Tom) 否定 一般疑问 对宾语提问 Change the sentences into the present perfect passive voice. EXAMPLE They’ve 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 si ... ...
