Unit 3 Discovering Useful Structures 课件-2022-2023学年高中英语人教版（2019）必修第二册

现在完成时被动语态 Present Perfect Passive Voice present(now) future past ① 不明确的过去时间开始的情况一直持续到现在 ② 不明确的过去时间的行为在现在的结果 The Present Perfect Tense I have lived in China for 5 years. 我在中国住了5年。（从5年前到现在，并且现在还在中国） 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） 不明确的过去时间开始的情况一直持续到现在 不明确的过去时间的行为在现在的结果 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) 时间状语 just; already; ever; never; yet; so far; by now 不明确的时间 一段时间 for 3 days; since 3 days ago 包括说话时间的 时间 this morning, this week, this month, this year 肯定式 主语+have/has+过去分词+其它 否定式 主语+have/has+not+过去分词+其它 一般问句 Have/Has+主语+过去分词+其它 特殊疑问句 疑问词+have/has+主语+过去分词+其它 现在完成时的基本结构 助动词 在主语后 助动词 在主语前 一般现在时 am / is / are + done 现在进行时 am / is / are + being + done 现在时的被动语态 现在完成时 have / has + been + done 自从2019年以来，新冠病毒一直困扰着人们的生活。 The Corona virus has disturbed people's lives since 2019. 这台电视已经修理三个小时了。 This machine has been repaired for three hours. 过去发生的动 作一直延续到 现在并有可能 还要继续下去 未完成用法 他已经做完作业了。 He has already finished his homework. 这台机器已经被修理了，所以你可以带回去了。 This machine has been repaired，so you can take it away. 过去发生的动 作在现在的结 果——对现在 产生影响 完成用法 常用“for+时间段”、“since+时间点”、“in the last/over+时间段”、all these years等状语 练习 We have already invited the singer. The singer has already been invited. The singer has not been invited yet. Has the singer been invited? Who has been invited? 被动 否定 一般疑问 对宾语提问 Exercises 1. First as a PC and then as a laptop, I ______________ (use) in offices and homes since the 1970s. 2. Over time my memory _____________ (develop) so much that I never forget anything I _____________ (told). 3. Since the 1970s many new applications ______________ (find) for me. 4. I have also ________ (put) into robots and used to make mobile phones as well as ______ (help) with medical operations. has developed have been told have been used have been found been put helped 一 般 进 行 完 成 现在 过去 将来 am/is/are done am/is/are being done hav