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课件网) Unit 5 Revealing nature Past perfect 1. It was a young man who _____ medical school without completing his degree. What’s more, he _____ a letter from his father predicting that he would be “a disgrace to yourself and all your family”. had left had recently received 2. After Darwin _____ some time in South America, his room on the ship was crowded with samples of the plants and animals he _____. had spent had collected 3. At that time, people believed that all species _____ on Earth at the same time, and _____ since. had appeared had not changed 4. It seemed their beaks _____ according to what food was available on that particular island. had evolved Look at the sentences from the reading passage and answer the questions. 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” 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), 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 had evolved from a common ancestor, ... Many people refused to believe that living things, including humans, 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 Past Past perfect 过去完成时 had done 一般过去时 did 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，即“过去的过去”。 过去完成时的基本用法： a.我们到达火车站之前，火车就已经离开了。 Before we got to the train station, the train _____. b.我还没来得及说谢谢，他就跑开了。 Before I could say “thank you”, he _____. had run away had already left past perfect 2) 表示从过去某一时间开始，一直延续到过去的另一个时间的动 作，常用的时间状语有 by then, by the end of, by the time。 a.到上学期期末为止，我们已经学习了2000个英语单词了。 By the end of last term, we _____ 2000 English words. b.到那时为止，他们已经在那里住了十年了。 They _____ there for ten years by then. had lived had learnt past perfect 3) 表示愿望、打算等的动词，如 hope, want, expect, think, mean, suppose, intend, plan 等后接从句时，一般用过去完成时表示本 打算实现而未实现的愿望和计划。 a.我本打算去机场接他，但是我有个重要的会议要参加。 I _____ to meet him at the ... ...
