Unit 3 The world of science Period 2 Using language 课件-2020-2021学年下学期高一英语同步精品课堂(外研版新教材必修第三册)

外研版英语 必修第三册 Unit 3 The world of science Period 2 Using language 1 Using language Present perfect passive Review Compare the following pairs of sentences and identify the basic sentence patterns of the present perfect and the present perfect passive. a I guess someone has asked you about the title of your book before. I guess you have been asked about the title of your book before. b People have used new inventions to make replacement hearts. New inventions have been used to make replacement hearts. Definition and Structures Active and passive structures of the present perfect tense. Definition This tense indicates the action that takes place in the past and continues to the present or affects the present Present perfect active voice Subject+ have/has done+... Present perfect passive voice Subject+ have/has been done+... Practice Rewrite the underlined sentences using the present perfect passive. ① It has already affected many things in our lives. ② Some restaurants i