Unit 3 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 Structure The Present Perfect Passive Voice Learning object: To learn the structure of the present perfect passive voice. To learn the usage of the present perfect passive voice. 第二届高中、中职学科教师微课大赛 Watch a video 以上句子中所使用的时态和语态是 。 现在完成时的被动语态 An enemy has been slained.一名敌人被击杀。 An ally has been slained.我方队友被击杀。 You have been slained.你被击杀了。 Verb form Active Passive have / has + been + v-ed The structure of the present perfect passive voice have /has + v-ed 主动 被动 have / has + been + v-ed Much has been written about the wonders of the World Wide Web. People have written much about the wonders of the World Wide Web. Read and compare The first one is passive form, while the second one is active. 1 Read the pairs of sentences. Underline and compare the different verb forms. has been v-ed has v-ed Can you find more examples of present perfect passive voice on P28? Much ______________(write) about the wonders of World Wide Web. People’s lives __________________（change）by online communities and social networks. Many people ____________________ (help) by the club. 4. Jan’s life _________________________ (improve) by the Internet. has/have +been done has been greatly improved have been helped has been changed has been written 第二届高中、中职学科教师微课大赛 The Present Perfect Tense Conclusion Structures Examples Active Voice Passive Voice S + have/has + Past Participle (V3) + O S + have/has been + PP (V3) + (by + O) She has just read a book. A book has just been read (by her). 用法 1. 现在完成时的被动语态同它的主动语态一样，强调过去的动作对现在造成的影响或结果，主语和谓语之间为被动关系，通常与already, yet, just, never, recently等副词连用。例：The machine has already been repaired. 2. 表示一个被动的动作或状态开始于过去，持续到现在，并可能持续下去，常与for或since引导的时间状语连用，或用于“How long...?”句型中。 例：Financial problems of the company have been discussed for nearly two hours. How long has this film been shown? 3. 用在时间或条件状语从句中，表示将来某时已完成的动作，即用现在完成时的被动语态代替将来完成时的被动语态。 例：You shouldn’t leave school before you