Unit 3 The World of Science Using language Present perfect passive 课件-2022-2023学年高中英语外研版（2019）必修第三册

. . Unit 3: The world of science Using Language: Present perfect passive At the end of the class, you’ll be able to: 1. Learn to identify Present perfect passive. 2. Understand the basic knowledge about Present perfect passive . 3. Write sentences using the passive. Lead-in 3D Laser Printer virtual reality wearable tech Lead-in . Richard’s new book The New Age of Invention (publish). Nowdays, important advances (make) in medicine and environmental science thanks to increasing computer power. New inventions like 3D printers use to make replacement hearts and bone parts. As for the time machine, Richard thinks nothing like this _______________(invent) yet . . Fill in the blanks according to the interview. has been invented have been used have been made has just been published Lead-in What is their common structure ? . Are you familiar with these sounds? Lead-in You have been slain. An ally has been slain. slay--slew/ slayed--slain/slayed 击杀 Present perfect passive 现在完成时的被动语态 done . What is the tense made up of? have/has been done have/has done be Present perfect Passive voice Present perfect passive Identify the tense . Understand the tense 1. Someone has asked “you” about the title of your book before. 2. People have used 3D printers to make replacement hearts and bone parts. Present perfect passive . Understand the tense 3. What is the difference between the two groups of sentences? 4. Why does the author choose to use the passive form instead of the active form in the reading passage? passive form active form To emphasise what has been done, rather than who or what does the action. Present perfect passive Understand the tense When to use the Present perfect passive? 1. 不知道或者没有必要说明动作的执行者是谁； Such books have been written for children. 2. 强调动作的承受者，而不是动作的执行者； All the products have been tested. 3. 动作的执行者很模糊; The letter has been opened. 4. 有时候为了礼貌