Unit 3 The world of science Using language课件-2022-2023学年高一英语外研版（2019）必修第三册

B3U3 The world of science Period 3 Using language --Present perfect passive Activity 1:Look and answer Look at the sentences from the reading passage and answer the questions.(P38-1) Ql.What has happened to“you”in sentence(a)? Someone has asked "you"about the title of your book before. a.I guess you have been asked about the title of your book before. b.New inventions like 3D printers have been used to make replacement hearts and bone parts. Q2.Who has used new inventions to make replacement hearts and bone parts in sentence(b)? People have used 3D printers to make replacement hearts and bone parts. Activity 1:Look and answer Look at the sentences from the reading passage and answer the questions. Q3.What is the difference between the two groups of sentences? Group 1 passive form with the subjects a.I guess you have been asked about the title of your book before. b.New inventions like 3D printers have been used to make replacement hearts and bone parts. Group 2 active f The author chooses to use the passive c.I guess som form instead of the active form to k before. d.People have emphasise what has been done,rather replacemer than who or what does the action. Q4.Why does the author choose to use the passive form instead of the active form in the reading passage? Present perfect passive 以下情况一般使用被动语态 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. (已经为儿童编写这类图书了。) 2.强调动作的承受者，而不强调动作的执行者。 All these products have been tested. (这些产品都经过测试了。) Present perfect passive 3.动作的执行者很模糊。 n opened。 （这封信被人拆开了。） 4.有时为了礼貌的需要，避免说出动作的执行者。 y have been told many times not to make noises。 （已经有人多次跟他们说别那么大声了。） Activity 2:Read and Rewrite Rewrite the underlined parts using the present perfect passive.(P38-2) Within the next 80 years,our lives may be changed beyond recognition by 3D printing.It has already affected many things in our lives,right down to the food we eat.For instance,some restaurants in London have served 3D-printed hamburgers to customers. But perhaps the most si