Unit 5 Revealing Nature 语法(过去完成时)导学案-2026-2027学年外研版高中英语选择性必修第一册

本讲义聚焦高中英语过去完成时核心语法点，系统梳理“过去的过去”本质定义、“had+过去分词”基本结构（肯定、否定、疑问句式），详解四大核心用法（动作先后、持续到过去、未实现愿望、固定句式）及与一般过去时、现在完成时的辨析，构建从概念到应用的完整知识支架。 该资料以“口诀+表格+情境例句”强化理解，如“一先一后，先had done，后did”口诀、易混标志词对比表及自然调研主题例句，提升语言能力与思维品质。分层练习（填空、改写、汉译英）覆盖不同技能，课中助教师高效授课，课后助学生巩固时态运用，查漏补缺。

Unit5 Revealing Nature语法讲解与练习 语法:过去完成时详细讲解 1. 核心定义 核心本质：过去完成时 = 过去的过去 结构：had + 过去分词 (done) 动作发生在「某个过去动作/过去时间点」之前，也就是：先发生的动作用过去完成时，后发生的动作用一般过去时。 口诀：一先一后，先 had done，后 did 2. 基本结构（必背） 肯定句：主语+ had +过去分词（done） 否定句：主语+ had not（hadn’t）+过去分词（done） 一般疑问句：Had +主语+过去分词（done）？ 特殊疑问句：特殊疑问词+ had +主语+过去分词（done）？ 3. 四大核心用法 用法一：表示过去某动作前已完成的动作（最常考） 强调动作有先后：先发生动作用过去完成时，后发生动作用一般过去时。 例句1：I had finished my field research before it rained. 译文：下雨之前，我已经完成了野外调研。 例句2：When the scientist arrived, the insects had disappeared. 译文：科学家到达时，昆虫已经消失不见了。 用法二：表示动作持续到过去某时 动作从过去某一时间开始，一直持续到过去另一时间，常搭配 for +时间段，since +过去时间点。 例句1：He had studied biological science for five years before he graduated. 译文：毕业前，他已经学习了五年生物科学。 例句2：The team had worked on the nature project since 2020. 译文：自2020年起，这个团队就一直在研究这个自然课题。 用法三：表示过去未曾实现的愿望、打算 常用动词：hope, plan, intend, expect, wish, mean，表“本打算/本希望但未实现”。 例句1：I had hoped to observe more wildlife, but the weather was bad. 译文：我本希望观察更多野生动物，但天气状况很差。 例句2：They had planned to finish the survey earlier. 译文：他们原本计划更早完成这次调研。 用法四：固定句式与宾语从句用法 1. 主句为一般过去时（said/thought/knew/found），从句动作先于主句，从句用过去完成时； 2. 固定句型：By the end of + 过去时间，主句必用过去完成时。 例句1：Scientists found that the plant had adapted to the harsh environment. 译文：科学家发现这种植物已经适应了恶劣的环境。 例句2：By the end of last month, we had collected plenty of nature data. 译文：到上个月底，我们已经收集了大量的自然数据。 4. 高频时间标志词（一眼判断题型） A. by +过去时间点 by 2008，by last year，by the end of last term，by the end of 2020 By the end of last term, we had learned 2000 words. 到上学期末为止，我们已经学了 2000 个单词。 B. before +过去时间/过去事件 He had left before I arrived. 在我到之前，他就已经走了。 C.when /before/after 引导时间状语从句 After he had finished his work, he went home. 在他完成工作之后，他回家了。（先完成，再回家） The train had left when we got to the station. 我们到车站的时候，火车已经开走了。（火车先走，我们后到） D.宾语从句：said /told/thought /knew等过去转述动词后面 主句动词是一般过去时，从句动作发生在主句说话之前，从句用过去完成时。 标志动词：said, thought, told, knew, realized, found, reported He said that he had seen the film. 他说他看过这部电影。（看电影在 “说” 之前） ❗易错坑：从句有明确过去时间状语，不用过去完成时，用一般过去时 He said he saw the movie in 2022.（有 in 2022，直接 did） E.易混辨析 标志短语 时态 by the end of + 过去时间 had done ✔过去完成 by the end of + 现在时间 have done ✔现在完成 by the end of + 将来时间 will have done ✔将来完成 It is the first time that have done It was the first time that had done hardly…when / no sooner…than 前 had done，后 did 5. 重难点时态辨析 （1）过去完成时 vs 一般过去时 一般过去时：只陈述过去发生的事实，无先后对比； 过去完成时：强调过去的过去，必须有过去时间作参照、体现动作先后。 对比例句 1. He left the lab.（单纯陈述过去事实） 2. He had left the lab before his teacher came.（老师来之前就离开了，有先后） （2）过去完成时 vs 现在完成时 现在完成时：以现在为参照，动作过去发生、影响现在； 过去完成时：以过去为参照，动作发生在过去之前，和现在无关联。 6. 核心易错点总结 1). 过去完成时不能单独使用，必须有过去时间/过去动作作参照； 2). 有before/after引导的时间状语从句，动作先后明确，可通用一般过去时，不强制用过去完成时； 3). by the end of + 过去时间 → 必用过去完成时； 4). 表“本打算未实现”，只能用 had planned/had hoped。 配套练习题 Ⅰ.用所给词的正确形式填空 提示：根据过去完成时用法、时态先后、时间标志词填写正确形式 1. By the end of last year, the researchers ________ (discover) many new plant species. 2. When I arrived at the forest, the birds ________ (fly) away. 3. He told me that he ________ (finish) his nature observation report. 4. I ________ (never see) such a special insect before I took part in the field trip. 5. The scientist ________ (study) this ecosystem for 10 years before he retired. 6. We ________ (collect) enough samples before the rain began to fall. 7. She ________ (hope) to record more animal behaviors, but time was limited. 8. By the time sunrise came, they ________ (wait) for the wildlife for two hours. 9. The teacher found that we ________ (learn) the basic rules of nature protection. 10. He ________ (not observe) this phenomenon before he joined the team. 11. Before I read this book, I ________ (know) little about biological adaptation. 12. The team ________ (complete) the survey before the deadline came. 13. I ________ (plan) to take photos of rare plants, but I forgot my camera. 14. By the end of last month, we ________ (carry out) three field researches. 15. When the guide arrived, we ________ (clean) the observation site already. 16. She said she ________ (never visit) such a unique natural reserve. 17. The weather ________ (change) suddenly before we started our trip. 18. He ________ (work) as a nature researcher before he became a teacher. 19. We ________ (gain) much experience in observation before this task. 20. By the time he was 30, he ________ (publish) five papers on nature science. 21. They ________ (not find) any trace of the rare animal before dark. 22. I ________ (read) many related articles before I wrote my report. 23. The plant ________ (grow) slowly for months before it bloomed. 24. Scientists ________ (prove) the theory before the conference was held. 25. She ________ (expect) to make new discoveries, and she finally succeeded. Ⅱ.句子改写 要求：根据动作先后，改写句子，精准使用过去完成时，保证句意不变、语法规范 1. He finished his research. Then he shared his findings.（用过去完成时合并） _____________________________________________________________ 2. I did not know the animal’s habit before I watched it carefully.（升级过去完成时） _____________________________________________________________ 3. By the end of last winter, we learned many skills of field observation.（时态纠错升级） _____________________________________________________________ 4. She planned to join the nature survey, but she was ill.（用had planned） _____________________________________________________________ 5. The rain stopped. Then we started our outdoor research.（用before连接+过去完成时） _____________________________________________________________ 6. The scientist found the plants adapted to the local climate.（从句升级过去完成时） _____________________________________________________________ 7. He never saw such beautiful natural scenery before he came here.（升级过去完成时） _____________________________________________________________ 8. They worked in the lab for six years before they moved to the field.（升级时态） _____________________________________________________________ 9. I learned a lot about nature after I read the scientific book.（反向改写，先读书记过去完成时） _____________________________________________________________ 10. The team completed two projects before last summer came.（强化过去完成时） _____________________________________________________________ Ⅲ.汉译英 1. 天黑之前，队员们已经完成了野外数据收集。 _____________________________________________________________ 2. 在我参加这次自然调研之前，我从未见过这种稀有植物。 _____________________________________________________________ 3. 到上个月底，这位科学家已经发表了三篇自然科学论文。 _____________________________________________________________ 4. 他告诉我他已经研究这种生态系统很多年了。 _____________________________________________________________ 5. 下雨之前，我们已经离开了森林观测基地。 _____________________________________________________________ 6. 我本希望记录更多野生动物的活动，但时间不够。 _____________________________________________________________ 7. 当向导到达时，我们已经整理好了所有的样本。 _____________________________________________________________ 8. 在来到自然保护区之前，他对生物适应性知之甚少。 _____________________________________________________________ 9. 到他三十岁时，他已经发现了多种新的昆虫物种。 _____________________________________________________________ 10. 团队在会议开始前就已经验证了这个科学理论。 _____________________________________________________________ 11. 她原本计划参加户外观察活动，但突发疾病打乱了计划。 _____________________________________________________________ 12. 在阅读相关书籍后，我掌握了更多自然观察的技巧。 _____________________________________________________________ 13. 秋天来临之前，这种植物已经储存了足够的养分。 _____________________________________________________________ 14. 老师发现我们已经掌握了基础的自然研究方法。 _____________________________________________________________ 15. 在搬迁之前，他们已经在这片区域研究了整整十年。 _____________________________________________________________ Keys Ⅰ.用所给词的正确形式填空 1. had discovered 2. had flown 3. had finished 4. had never seen 5. had studied 6. had collected 7. had hoped 8. had waited 9. had learned 10. hadn’t observed 11. had known 12. had completed 13. had planned 14. had carried out 15. had cleaned 16. had never visited 17. had changed 18. had worked 19. had gained 20. had published 21. hadn’t found 22. had read 23. had grown 24. had proved 25. had expected Ⅱ.句子改写 1. He had finished his research before he shared his findings. 2. I had known little about the animal’s habit before I watched it carefully. 3. By the end of last winter, we had learned many skills of field observation. 4. She had planned to join the nature survey, but she was ill. 5. The rain had stopped before we started our outdoor research. 6. The scientist found that the plants had adapted to the local climate. 7. He had never seen such beautiful natural scenery before he came here. 8. They had worked in the lab for six years before they moved to the field. 9. I had read the scientific book before I learned a lot about nature. 10. The team had completed two projects before last summer came. Ⅲ.汉译英 1. Before it got dark, the team members had finished collecting field data. 2. Before I took part in this nature survey, I had never seen such rare plants. 3. By the end of last month, the scientist had published three papers on natural science. 4. He told me that he had studied this ecosystem for many years. 5. Before it rained, we had left the forest observation base. 6. I had hoped to record more wild animal activities, but I didn’t have enough time. 7. When the guide arrived, we had sorted out all the samples. 8. Before coming to the nature reserve, he had known little about biological adaptation. 9. By the time he was thirty, he had discovered many new insect species. 10. The team had proved this scientific theory before the meeting started. 11. She had planned to take part in the outdoor observation activity, but a sudden illness ruined her plan. 12. After I had read relevant books, I mastered more skills of nature observation. 13. The plant had stored enough nutrients before autumn came. 14. The teacher found that we had mastered basic nature research methods. 15. Before moving away, they had studied in this area for a whole decade. 2 / 2 学科网（北京）股份有限公司 $