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课件网) Unit 5 Unit 5 Revealing nature Past perfect To understand the function of the past perfect. To learn the use of the past perfect. To know something about Lonesome George. Look at the sentences from the reading passage and answer the questions. 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 Darwin suspected that the finches had evolved from a common ancestor, ... Many people refused to believe that living things, including humans, had evolved from lower forms of life. In sentence (a), which action happened first, “suspected” or “evolved from a common ancestor” In sentence (a), “evolved form a common ancestor” happened first. 2. 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. Darwin suspected that the finches , ... b. Many people refused to believe that living things, including humans, had evolved from a common ancestor had evolved from lower forms of life. 3. What does the structure had done indicate It indicates the action happened before a certain past action. Darwin suspected that the finches had evolved from a common ancestor, ... Many people refused to believe that living things, including humans, had evolved from lower forms of life. Now look for more sentences with the past perfect tense in the reading passage, and summarise its use in your own words. 1. It was a young man who had left medical school without completing his degree. 2. What’s more, 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 American, his room on the ship was crowded 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 seems 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. We use the Past Perfect Tense to say that something had already happened before another past action or specific time in the past. present past past perfect time the action which occurs previously in time is expressed in the past perfect tense the action which occurs later is expressed in the past tense 肯定式为“had +过去分词” 否定式为“had not +过去分词” 助动词 过去完成时 构成 思考：had在结构中的功能是什么？ 1. 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：过去的过去。 用法 eg Before we got to the train station, the train had already left. (我们到达火车站之前，火车就已经离开了。) 常用时间状语：be then, by the end of, by the time. eg By the end ... ...
