Unit3 The Internet Discovering Useful Structures 课件(共17张PPT)人教版(2019)第二册

(课件网) Discovering Useful Structures: Talk about something that has been done Unit 3 The Internet Review What is the passive voice？ 语态 主动 被动 “不好了，班主任批人了” “谁要被班主任批了？” 强调动作执行者 强调动作承受者 Presentation The present perfect passive voice 语态用来表示主语与谓语之间的关系，它是动词的一种形式。英语中有两种语态：主动语态和被动语态。主动语态表示主语是动作的执行者，而被动语态表示主语是动作的承受者。 思考：什么时候用被动语态 不知道动作的执行者 没有必要指出动作的执行者 强调动作的承受者 Review What is present perfect tense （1）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; （2）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。 1.Definition 定义 past present（now） future Review What is present perfect tense 2.Structure 结构 Types Structure 肯定句 主语+ have/has + 动词过去分词 + 宾语 否定句 主语+ have/has + not + 动词过去分词 + 宾语 一般疑问句 Have/Has + 主语 +动词过去分词 + 宾语？ 特殊疑问句 特殊疑问词或词组 + 一般疑问句(have/has + 主语 + 过去分词 + 其他）？ Presentation The present perfect passive voice Read the pairs of sentences. Underline and compare the different verb forms. 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. Verb form Active Passive have/has + done have/has + been + done Presentation The present perfect passive voice 类型 现在完成时之被动语态句式 例句 肯定句 主语＋have/has been done... The research has been done successfully. 否定句 主语＋have/has not been done... The author’s new story has not been published. 一般 疑问句 Have/Has＋主语＋been done...？ Has his washing machine been repaired 特殊 疑问句 疑问词＋have/has＋ 主语＋been done… Who has been invited Practice The present perfect passive voice 1. The letter _____ (post) already. 2. Many houses _____ (build) for the poor so far. 3. The machine _____ (repair) for two hours but it still doesn’t work. 4. Paper money _____ (use) for over 50 years. has been used has been repaired have been built has been posted Presentation The present perfect passive voice 1. 思考：现在完成时的被动语态有什么意义？ 主语和谓语是被动的关系： 表示动作从过去一直持续到现在，有可能还会继续进行 动作已经完成，强调对现在造成的影响或结果 2. 主动变被动的原则 三变 原句主语→by的宾语 宾语→主语 谓语形式由主动→被动 三不变 原句意思不变 原句时态不变 原句主谓宾以外成分不变 Practice The present perfect passive voice Change the sentences below into the present perfect passive voice. 1. I have downloaded the software to help my phone battery last longer. The software has been downloaded to help my phone battery last longer. 2. Someone has lost an identity card. An identity card has been lost. They’ve built a kind of new PC with more functions A kind of new PC has been built with more functions. Example: Practice The pres ... ...