Unit 5 Revealing nature Using language Grammar课件-2023-2024学年高中英语外研版（2019）选择性必修第一册

Unit 5 Using language 高中新外延选择性必修一 past perfect Using language Learning objectives To discover and master the concept, characteristics and usage of “past perfect tense”. Be able to use it flexibly in real contexts. 1 In sentence (a), which action happened first, “suspected” or “evolved from a common ancestor”? 2 In sentence (b), which action happened first, “refused to believe” or “evolved from lower forms of life”? 3 What does the structure had done indicate? Look at the sentences from the reading passage and answer the questions. a Darwin suspected that the finches had evolved from a common ancestor, … b Many people refused to believe that living things, including humans, had evolved from lower forms of life. 1 In sentence (a), “evolved from a ... ancestor” happened first. 2 In sentence (b), “evolved from lower... life” happened first. It indicates the action happened before a certain past action. 1 It was a young man who had left medical school without completing his degree. (Para 1) 2 He had recently received a letter from his father. (Para 1) 3 After Darwin had spent some time in South America, his room on the ship was crowded with samples of the plants and animals he had collected. (Para 2) 4 At that time, people believed that all species had appeared on Earth at the same time, and had not changed since. (Para 3) 5 It seemed their beaks had evolved according to what food was available on that particular island. (Para 4) Find more sentences with the past perfect tense in the text. Complete the paragraphs with the information from the given sentences. 1 a Natural disasters led to food shortages in the 1960s. b Yuan Longping began to do research on hybrid rice. c Yuan Longping developed a better type of rice. Yuan Longping 1 _to do research on hybrid rice because natural disasters 2 _ food shortages in the 1960s. In the end, he 3 _ a better type of rice. began had led to developed Complete the paragraphs with the information from the given sentences. 2 a Gregor M