Unit 2 Lesson 5 Grammar in Use 课件 2026-2027学年仁爱科普版英语九年级上册

该初中英语课件围绕“Greener Planet, Better Home”主题，聚焦前缀re-构词规则及现在完成时中since和for的用法。课堂导入通过“词根·词缀·记单词”列举rebuild等词，结合对话情境呈现语法点，从具体词汇、句子到规则总结，搭建循序渐进的学习支架。 其亮点在于将环保主题与语言知识融合，通过任务型活动（如re-前缀单词填空、现在完成时对话分析）和结构化总结（用法分类表格）提升学生语言能力。对比探究since/for用法培养思维品质，词根词缀法助力学习能力发展，学生能提升语言运用与自主学习能力，教师可获得清晰教学路径与丰富活动资源。

Unit 2 Greener Planet, Better Home Grammar in Use 1 Learning aims 能在现在完成时中正确使用since和for 能掌握前缀re-的构词规则及意义 2 Lead in What’s the meaning of prefix re-? 3 Activity 1 Know how to use the prefix re- 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. 4 Summarize 一、基本含义 项目 内容 来源 拉丁语，意为"再次、重新、回来" 核心意义 表示 "再一次"、"重新"、"回到原来的状态或位置" 用法 加在动词或名词前面，构成新词 二、主要用法分类 用法 1：表示"再一次"（again） 表示重复做某个动作。 单词 拆解 中文释义 reuse re + use（使用） 重新使用，再次使用 rewrite re + write（写） 重写，改写 reread re + read（读） 重读，再读一遍 replay re + play（播放/玩） 重播；重新比赛 retell re + tell（讲述） 复述，再讲一遍 reopen re + open（打开） 重新打开 例句： Please rewrite your homework. It has too many mistakes. 用法 2：表示"重新、恢复"（back to original state） 表示回到原来的状态、位置或情况。 单词 拆解 中文释义 return re + turn（转） 返回，归还（转回去） rebuild re + build（建造） 重建，重修 recover re + cover（覆盖） 恢复；找回（重新覆盖/拿回） recycle re + cycle（循环） 回收利用（重新进入循环） replace re + place（放置） 放回；取代（重新放置） 例句： They plan to rebuild the old bridge. 用法 3：表示"反向、往回"（backward） 表示动作方向往回。 单词 拆解 中文释义 reply re + ply（折叠） 回复，回答（折叠回去，引申为回应） react re + act（行动） 反应，回应（回过去行动） recall re + call（呼叫） 回想起；召回（呼叫回来） 例句： I can't recall her name. 我想不起她的名字。 Make new words with the prefix re- and then fill in the blanks. re take visit write build + 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 rebuilt rewrite Exercise 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 Activity 2 Present perfect tense (II) Read the conversation and pay attention to the words in bold. Hi, Kangkang! Did you take part in the speech about waste sorting last Saturday? Yes, I did. I have learned a lot about sorting the waste since I listened to the speech. Me too. I have kept sorting out all the waste at home for five days. Now I am really good at it. Present perfect tense+for+一段时间 Present perfect tense+since+过去时间点 先看对话里的这两个句子： I have learned a lot about sorting the waste since I listened to the speech. I have kept sorting out all the waste at home for five days. 请你观察并回答下面几个问题（在心里想答案）： 句1中，since 后面跟的是什么？是一个词，还是一个句子？ 句2中，for 后面跟的是什么？是一个词，还是一个短语？ 两个动作（learn / keep）是发生在过去，还是现在？ 它们现在有没有结束？ 语法探究 对比探究（找规律） 我们把两个句子拆开看： 句子/词 时间词 后面接的内容 表示什么 since I listened to the speech since 一个过去的时间点（“我听演讲的时候”） 动作从“那个过去时刻”开始 for five days for 一段时间的长度（“五天”） 动作持续了“这么长一段时间” since也可以直接接过去的时间点，比如since2019 规律总结 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 Exercise 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) ___________________________________________________ 2. How long has Lingling been in the tree planting activity? (one year) ___________________________________________________ 3. Have you ever recycled to protect our environment? If so, how long have you been like this? ___________________________________________________ Li Wei has kept sorting the waste since 3 years ago. Lingling has been in the tree planting for one year. Yes. I have been like this for three years/since three years ago. Homework 1 Write five sentences with present perfect tense. 2 Preview the next period. 16 Lavf56.15.100 $