Unit 1 The Mass Media Grammar and usage 课件-2023-2024学年高中英语译林版（2020）选择性必修第二册

B5U1 The mass media Grammar and Usage Learning objectives By the end of this section, you will be able to: 1. understand the usage of the past perfect tense; 2. identify the verb form of the past perfect tense; 3. use the right forms of the past perfect tense to correct the mistakes and complete an article; 4. apply the past perfect tense in new situations. Part 1 Leading in Past perfect Look at the sentences and answer the questions. In sentence (a), which action happened first, “suspected” or “evolved from a common ancestor”? In sentence (a), “evolved from a common ancestor” happened first. 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. Exploring the rules In sentence (b), which action happened first, “refused to believe” or “evolved from lower forms of life”? In sentence (b), “evolved from lower forms of life” happened first. 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. Past perfect Look at the sentences and answer the questions. Exploring the rules It indicates the action happened before a certain past action. 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. Past perfect Look at the sentences and answer the questions. Exploring the rules Complete the paragraphs with the information from the given sentences. The sentences are in the order in which they happened. 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