Unit2 Grammar in Use 课件 2026-2027学年九年级上册仁爱科普版英语

该初中英语课件围绕“Greener Planet, Better Home”主题，聚焦前缀re-的变化规则及现在完成时中for与since的用法。课堂导入通过环保情境对比原句（如“use again”与“reuse”），引导学生观察发现re-表“再次”等含义，构建从具体实例到规则总结的学习支架。 其亮点在于以情境化活动培养语言能力，如通过图片观察、动词组合填空掌握re-用法，借助对话、表格对比区分for（时间段）与since（时间点）。结合环保主题作业（设计再生海报、撰写经历）渗透文化意识，同伴合作检测提升学习能力。学生能在实践中提升语言应用与环保责任感，教师可获得结构化教学资源与评价方式。

Unit 2 Greener Planet, Better Home Grammar in Use 国家中小学课程资源 通过本课的学习，学生能够: 1. 借助看、读、说的活动，来发现The prefix re-的变化规 则和用法。 2. 运用所学的语言知识，理解和掌握for和since在现在完成 时中的区别和用法，并能在现实生活中熟练应用； 3. 通过同伴合作、交流互评的方式，来检测对本节课知识 点的掌握情况。 Learning Objectives Grammar in Use The prefix re- We should use the waste bottles again to water the plants. We should reuse the waste bottles to water the plants. Lead in What should we do to make a green world? They have planted many young trees to green their hometown. They replant many young trees to green their hometown. Lead in Activity 1 Look at the picture and read the sentence. 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. Activity 1 Look at the picture and read the sentence.Pay attention to the words in bold. Our community has renewed calls for cleaning up the waste along the river. Activity 1 Look at the picture and read the sentence.Pay attention to the words in bold. re- v. Look at the words and what can you find? prefix re- : 表示“再次”“重复”或“回、向后”的含义，其拼写会根据后续词根的首字母发生变化，以确保发音流畅。 re-use re-cycle re-new prefix re- 变化规则及用法详解： 1. 基本拼写规则 ·re- + 以元音或 h开头的词根时，常加连字符或双写首字母（少数情况下）以避免发音混淆： re-enter（重新进入）（避免发音类似 reen-ter）re-elect（重新选举）re-address（重新处理） ·re- + 以 辅音开头的词根时，直接合并，无连字符： rebuild（重建）reconsider（重新考虑）recycle（回收）2. 语义变化 ·重复动作：rewrite（重写）replay（重播） ·返回原状态/位置：return（返回）recall（召回/回忆） 3. 发音注意 ·重音通常在 re- 之后的音节：reˈnew（更新）reˈplace（替换） *但部分词重音在 re- 上，语义可能不同：ˈrecord（v. 记录） vs. reˈcord（v. 重新记录）4. 易混淆词辨析 recover（恢复） vs. re-cover（重新覆盖） 5. 特殊规则 词根本身以 e 开头时，可能省略一个 eg. re + educate → reeducate（再教育） Activity 2 Make new words with the prefix re- and then fill in the blanks . 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. re ＋ take visit write build revisit retake rebuild rewrite Make new words with the prefix re- and then fill in the blanks . 1.The company decided to __________ its headquarters. 2.I had to __________the homework because of some mistakes. 3.Please __________ the last song. 4.Let me __________ your memory with some facts. re ＋ do play locate fresh relocate redo replay refresh Activity 3 Read the text and fill in the blanks with the given words. 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. recreate reuse reduce rethink rethink reuse reduce recreate present perfect tense(II) 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 waste sorting since I listened to the speech. Grammar in Use Read the conversation again and answer the following questions. 1. Has Kankang learned a lot about sorting waste since he listened to the speech? Yes, he has . 2. How long has Xiao Ya kept sorting waste? Xiao Ya has kept sorting waste for five days. Activity 2 Complete the table and learn how to use for and since. for since ＋ a period of time __________ two weeks ago __________ two weeks ＋ a point in time(in the past) 1.We haven't seen any waste in the river __________ several months. 2.－How long has your city sorted 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 waste? (3 years ago) _______________________________________________. 2.How long has Lingling been in the tree planting activity? (one year) _______________________________________________. 3.Have you ever recycled to protect the environment? If so, how long have you recycled like this? _______________________________________________. Since three years ago For one year Yes, I have. I have been recycled to protect our environment for two years/since 2011.... Read the text and fill in the blanks with have,has, for or since. My name is Lucy. I __________ been learning piano __________ I was 6 years old. That means I have played the piano __________ 12 years now! My teacher, Mrs. Smith, __________ taught me __________ 2019. She says I __________ made great progress __________ the past two years. have since for has since have for Practice We learn: 1. 借助看、读、说的活动，来发现The prefix re-的变化规则和用法； 2. 理解for和since在现在完成时中的区别和用法：for+时间段，since+过 去的时间点； We can: 1. 运用所学语言知识，理解并掌握前缀re-的变化规则及用法； 2. 在理解的基础上，掌握for和since在现在完成时中的区别和用法，并能 在现实生活中熟练应用； 2. 通过同伴合作、交流互评的方式，来检测对本节课知识点的掌握情况。 Summary 用5个“re-”词汇设计一张循环再生主题环保海报 eg.reuse, reduce, recycle, rethink, replant and so on； 根据提示写一段话，不少于100词（至少使用3次for/since)； 提示：描述你的环保行动经历，开头已给出： I have volunteered in an environmental organization since two years ago... Homework You should You may Thank you! $