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课件网) Unit 3 Discovering Useful Structure Present Perfect Passive Voice 完成时时态 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) 现在完成时 主动： 被动： 1) 动作或状态从过去开始,一直持续到现在, 常与下列时间状语连用: so far, up to now, up till now, by now, recently, lately, in recent years; (ever) since+一般过去时, in / during / over the past / last... years/months/days/weeks, over the years 1.His first novel has received good reviews since it came out last month. 2) 动作或状态发生在过去,但对现在有影响或结果 2.I got caught in the rain and my suit has been damaged. have/has done have/has been done 现在完成时 主动： 被动： 3) 固定句型:It / This / That is the first (second, third…) time that… +现在完成时，表示“第几次做某事” 3.This is the first time we have seen a film in the cinema together as a family. have/has done have/has been done 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。 练习 1.Every means _____(try) to protect pandas over the past 10 years. 2.Many kinds of apps _____(create) to attract young people to play games so far. 3.Many words _____(add) to the language since it was published. has been tried have been created have been added 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 过去完成时 主动： 被动： 1)过去的过去。常与过去完成时连用的时间状语有by/before+一般过去时 By the time Jack returned from home from England, his son had graduated from college. 2) 固定句型: It/This was the first/second/third... time that sb. had done sth..到过去某一时间某人第几次做某事 It was the first time that he had left his native land. had done had been done 练习 1. The young man, when questioned why he _____(break) the law, just looked at the policeman and said nothing.2. No sooner _____ Mo Yan _____ (step) on the stage than the audience broke into thunderous applause.3. —Did you have difficulty finding Ann's house —Not really. She _____ (give) us clear directions and we were able to find it easily.4. It is the first time he _____ (visit) this city.5. I _____ (intend) to call you, but was prevented from something unexpected. 练习 6. Hardly had he begun to speak when the audience _____ (interrupt) him7. Though I _____ (explain) the text three times, the boy still couldn’t understand it ... ...
