Unit 5 Revealing nature Grammar 课件-2023-2024学年高二英语外研版（2019）选择性必修第一册

外研选择性必修 第一册 Unit 5 Period 2 Grammar 1 2 To know the usage of past perfect tense To use past perfect tense correctly 学习目标 目标一：To know the usage of past perfect tense Activity 1: Look at the sentences from the reading passage and answer the question. 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), 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? In sentence (a), “evolved from a common ancestor” happened first. In sentence (b), “evolved from lower forms of life” happened first. It indicates the action happened before a certain past action. Now look for more sentences with the past perfect tense in the reading passage, and summarise their uses in your own words. 1. It was a young man who had left medical school without completing his degree. 2. ... he had recently received a letter from his father predicting that he would be “a disgrace to yourself and all your family. 3. After Darwin had spent some time in South America, his room on the ship was crowed with samples of the plants and animals he had collected. 4. At that time, people believed that all species had appeared on Earth at the same time, and had not changed since. 5. It seemed their beaks had evolved according to what food was available on that particular island. 6. Over time, it had slowly evolved into many new species. Activity 2: Read the following groups of sentences and summarise the usage of past perfect tense. Group 1： a.Before we got to the train station, the train had already left. b.Before I could say “thank you”, he had run away. Summary:表示在过去的某一时间或某一动作之前完成的动作或存在的状态，即“______________________”。 过去的过去 Group 2: a.By the end of last term, we had learnt 2,000 Eng