Unit 3 Lesson 5 Grammar in Use课件2026-2027学年仁爱科普版英语九年级上册

该初中英语课件聚焦前缀re-构成动词及现在完成时中for/since的用法，通过观察图片句子导入，先总结re-表“再/重新”“返回”的含义及常见词，再结合环保语境练习应用，后过渡到for/since的区别学习，形成由观察到总结再到应用的学习支架。 其亮点在于以环保主题为载体，将语法学习与实际语境结合，通过Activity 3填空、对话练习等活动，提升学生语言能力（运用re-动词和for/since描述环保行为）和思维品质（分析for/since的用法区别）。采用“观察-总结-应用”模式，学生能在实践中掌握语法，增强环保意识，教师可借助清晰结构高效开展教学。

Unit 3 A Green Earth, a Better Home Grammar in Use 学习目标 1 能理解并运用前缀 re- 构成新动词, 掌握其核心含义。 2 能掌握并正确运用现在完成时中 for 和 since 的用法区别。 3 能在语境中正确使用前缀 re- 构成的动词和 for/since 结构 描述环保行为和经历。 新课讲授 Grammar Ⅰ The prefix re- Observing Activity 1 Look at the pictures and read the sentences. Pay attention to the words in bold. It's a good idea to reuse plastic bags as waste bags. Scientists have found a new way to recycle waste paper into new paper products. Our community has renewed calls for cleaning up the waste along the river. 以 re- 开头的动词用法 re- 前缀有两类用法：一是附在动词前构成新动词，表示“再；又；重新”，侧重动作再次发生；二是表示“返回；回应”，侧重回到原先状态。常见词有： ★ reuse（再利用）—— 再次使用 ★ rewrite（重写）—— 重新书写 ★ retell（复述）—— 再次讲述 ★ return（返回）—— 回到原处 ★ review（复习；回顾）—— 再看一遍 ★ repair（修理）—— 使恢复完好 e.g. We should reuse plastic bags. e.g. Please rewrite your composition. e.g. He will return home next week. e.g. I review lessons every evening. Summarizing Applying Activity 2 Make new words with the suffix -en and fill in the blanks with their correct forms. take visit write build re ＋ retake 重新采取 revisit 重新参观 rewrite 重写 rebuild 重建 retake revisit rewrite rebuild 1. We will ________ the insect museum to learn more about ants. 2. Whenever there is pollution again, we need to ________ the action to stop it. 3. After the earthquake, people ________ the city with the help from all over the world. 4. We can help ________ the world history by saving every drop of water. revisit retake rebuild rewrite Activity 3 Read the text and fill in the blanks with the given words. recreate reuse reduce rethink Many people use plastic bags to carry their things and throw the bags away. Perhaps, we should ________ about this and find a better way to use them. One of the ways is to ________ them. After we bring our things home in a plastic bag, we can save it and use it again for something else. This is a great way to ________ the number of new plastic bags. By reusing plastic bags, we can cut down pollution and ________ a greener world. rethink reuse reduce recreate Grammar Ⅱ Present perfect tense (Ⅱ) Observing Activity 1 Pair work. Read the conversation. Pay attention to the present perfect tense of verbs. Hi, Kangkang! Did you take part in the speech about waste sorting last Saturday? Me too. I have kept sorting out all the waste at home for five days. Now I am really good at it. Yes, I did. I have learned a lot about sorting the waste since I listened to the speech. Summarizing Present Perfect Tense (Ⅱ) 现在完成时 基本用法 核心区别 for 和 since 核心概念 在现在完成时的“未完成用法”中，since 和 for 是两个最重要的时间状语标志词。它们都表示“持续”，但用法不同： since：表示动作从过去的某个时间点开始，一直持续到现在。 for：表示动作持续了多长时间。 [核心含义] since：“自从……以来”/ for：“长达……（时间）” e.g. I have lived here since 2010. （我从2010年起就住在这里。）→ 从2010年开始持续到现在 e.g. I have lived here for ten years. （我住在这里十年了。）→ 持续了十年 基本结构 since 的用法 结构： have/has + 过去分词 + since + 时间点 e.g. She has worked here since 2018.（她从2018年起就在这里工作。） e.g. I have known him since I was a child.（我从小就认识他。） e.g. We have lived in Beijing since 2015.（我们从2015年起就住在北京。） for 的用法 结构： have/has + 过去分词 + for + 时间段 e.g. I have lived here for ten years.（我住在这里十年了。） e.g. She has studied English for five years.（她学英语五年了。） e.g. We have waited for you for two hours.（我们等了你两个小时。） since 与 for 的核心区别 对比项 since for 含义 “自从……”（表示起点） “长达……”（表示时长） 后接内容 时间点 / 一般过去时的从句 时间段 提问方式 How long...? How long...? 示例 since 2010, since I was born for two years, for a week since 后可以接一个时间状语从句，从句用一般过去时。 结构： 主句（现在完成时）+ since + 从句（一般过去时） e.g. I have lived here since I was born. （我自出生起就住在这里。） e.g. She has worked in this company since she graduated from college. （她自从大学毕业就在这家公司工作。） e.g. Great changes have taken place since he left. （自从他离开后，发生了巨大的变化。） e.g. We have known each other since we were children. （我们从小就认识。） Applying Activity 2 Complete the table and learn how to use for and since. for + a period of time _________ two weeks since + a point in time (in the past) _________ two weeks ago 1. We haven't seen any waste in the river _________ several months. 2. — How long has your city sorted the waste? — _________ 2020. 3. I have been in an environmental group _________ the new term began. for since for Since since Activity 3 Look at the pictures and answer the questions with for or since. 1. How long has Li Wei kept sorting the waste? (3 years ago) _______________________________________ _______________________________________ He has kept sorting the waste since 3 years ago. 2. How long has Lingling been in the tree planting activity? (one year) _______________________________________ _______________________________________ She has been in the tree planting activity for one year. 3. Have you ever recycled to protect our environment? If so, how long have you been like this? _______________________________________ _______________________________________ Yes, I have. I have recycled for two years. / I have recycled since I was in primary school. I can 理解并运用前缀 re- 构成新动词, 掌握其核心含义。 掌握并正确运用现在完成时中 for 和 since 的用法区别。 在语境中正确使用前缀 re- 构成的动词和 for/since 结构 描述环保行为和经历。 Reflecting ✍ 用前缀 re- 将5个动词变为新词， 并用每个词造一个句子。 ✍ 用现在完成时和 for/since 写5句 话，描述你参加过的环保活动。 Homework $