Unit1 Section A Grammar(4a～4c)课件 2026-2027学年人教版初中英语学九年级上册

该初中英语课件聚焦一般过去时与现在完成时的语法教学，通过"Lead in"环节的例句识别活动引入时态概念，再以表格形式系统归纳一般过去时的时间状语、变化规则及核心用法，随后过渡到现在完成时的时间词、结构规律与核心用法，构建从识别到归纳的学习支架。 其亮点在于采用对比分析与情境应用相结合的教学方法，通过"一般过去时vs现在完成时"表格明确时态差异，结合家乡变化对话、短文填空等练习，培养学生的语言能力与思维品质，帮助学生在实际语境中掌握语法知识，教师可借助系统的归纳与练习设计提升教学效率。

Section A Grammar (4a~4c) The Changing World Unit 1 Learning aims 能掌握一般过去时的用法 能掌握现在完成时的用法 2 Lead in He became a good friend of yourgrandfather about 20 years ago. They haven’t seen each other for ages! We used to have to travel far to see a doctor. Our village has just built a new hospital. Many people used to work in big cities. Now, more of them have come back to live and work here. What tense are they? Activity 1 Learn to use simple past tense Sentence Time He became a good friend of yourgrandfather about 20 years ago. We used to have to travel far to see a doctor. Many people used to work in big cities. Look and find out the time words. about 20 years ago 20年前 used to 曾经 used to 曾经 4 一般过去时的标志词（时间状语） 类型 例子 明确过去时间 上下文暗示（无时间词，但明显过去） 过去习惯结构 yesterday, last night/week/year, in 1990, an hour ago when I was young, before, just now used to + 动词原形 一般过去时表示过去发生的动作或状态，通常有明确的过去时间状语，谓语动词用过去式。 过去式归纳变化规则 规则变化（占大多数） 类型 变化规则 原型→过去式 一般动词 以 e 结尾 辅音 + y 结尾 重读闭音节、末尾一个辅音字母 直接 + ed 直接 + d 变 y 为 i + ed 双写末尾字母 + ed play → played use → used study → studied stop → stopped 不规则 单独记忆 go → went, have → had 归纳一般过去时的核心用法 用法 说明 例句 表示过去某个时间发生的动作 He became a friend 20 years ago. 动作已结束， 与现在无关 She was a teacher before. 表示过去存在的状态 状态已改变 表示过去经常或习惯性的动作 常与 used to 或 often, always 等连用 We used to travel far to see a doctor. Activity 2 Use present perfect tense 发现与观察（从例句中找规律） 例句 时间词 动作发生的时间 强调的重点 They haven’t seen each other for ages! Our village has just built a new hospital. Now, more of them have come back to live and work here. for ages just Now（现在） 过去到现在 最近（刚发生） 过去 → 现在 状态持续到现在 对现在的影响（现在有医院了） 过去的动作导致现在的状态（回来了） 归纳现在完成时的核心用法 用法 说明 例句 Our village has just built a new hospital. They haven’t seen each other for ages! Now, more of them have come back to live and work here. 表示过去发生的动作对现在有影响 表示过去开始的动作或状态持续到现在 表示过去的经历或经验 动作已完成，结果或影响现在仍存在 可能还会持续下去 不强调具体时间，只问“有没有过” 从例句中找出常见信号词： 信号词 含义 例句 for + 一段时间 持续了多久 for ages, for 3 years since + 过去时间点 从…开始 since 2010, since last week just 刚刚 has just built already 已经 I have already eaten. ever / never 曾经 / 从未 Have you ever seen it? yet 还没（用于否定/疑问） He hasn’t come yet. so far / up to now 到目前为止 So far, so good. 结构规律（发现公式） 从例句中提取结构： 肯定句：have / has + 过去分词 → They have come back. → Our village has built a hospital. 否定句：have / has + not + 过去分词 → They haven’t seen each other. 疑问句：Have / Has + 主语 + 过去分词？ → Has he come back? 对比发现：一般过去时 vs 现在完成时 对比维度 一般过去时 现在完成时 时间状语 yesterday, ago, last year, in 1990 for, since, just, already, ever, never, yet 强调重点 只讲过去发生的事 强调与现在的联系 例句 I saw him yesterday. I have seen him before. （我知道他长什么样） 能否与现在相关？ 不相关 密切相关 Exercise A: __________ you ___________ (be) to the new library yet? B: No, I __________ (not know) there was a new library. When did it __________ (open)? A: It __________ (open) last Friday.I __________ (go) there with my grandpa on Saturday night. B: __________ you __________ (like) it? A: Of course! It’s the most high-tech library I ________ ever ________ (visit). B: Oh, what __________ you __________ there? (see) A: There are sections with books about science and Chinese culture, as well as a huge section with children’s books. I also __________ (read) some digital books on the computer. My grandpa __________ (listen) to some audio books because he can’t see well. B: Cool! I __________ (bring) my little brother tomorrow. Complete the conversation with the correct forms of the verbs in brackets. Have been don’t know open opened went Did like have visited did see read listened will bring In the past, it ________ (be) difficult to travel in Guizhou. In many places, there used to ________ (be) no bridges to cross over mountains and rivers, and most roads were just dirt tracks. This ________ (make) it difficult for locals to bring products to the market or to develop industry. Now great changes ________ (take) place. The government ________ (build) thousands of kilometres of highways, railways, and wide roads. It has also built many high bridges over mountains and rivers. A journey that used to ________ (take) a day now takes only a few_____________ (improve). They are much richer and happier than they once hours. As a result, the lives of local people________ (be). Complete the passage with the correct forms of the verbs in brackets. Why are local people richer and happier than before? was be made have taken has built take were have improved Talk about the changes in your hometown with simple past tense and present perfect tense. Think deeply: What brings about these changes in our lives? Summary ◆一般过去时 ◆现在完成时 16 Homework 1. Write ten sentences with simple past tense and present perfect tense. 2. Finish the exercises. 17 $