Unit 1 Section A (4a~4d) 课件 2026-2027学年英语人教版九年级上册

这是一份Unit 1 Section A (4a~4d) 课件 2026-2027学年英语人教版九年级上册，共20页。
Unit 1The Changing WorldSection A (4a~4d)能掌握一般过去时的用法能掌握现在完成时的用法What tense are they?一、核心语法总览二、一般过去时表示过去某个时间发生的动作、存在的状态，或过去习惯性、反复性的动作。动作已彻底结束，与现在时间无任何关联。结构公式·●肯定句：主语+动词过去式+其他/ 主语+was/were+其他●否定句：主+didn't+动原+其他/ 主+was/were+not+其他●疑问句：Did+主语+动原+其他？/ Was/Were+主语+...？标志性时间状语（必背）：1.具体过去时间点：yesterday（昨天）、last night/ week/ month（昨晚/上周/上月）、in 2010（在2010年）...2.“时间段+ago”：two days ago（两天前）、five years ago（五年前）...3.过去特定场景：just now(刚才）、the day before yesterday（前天）...三、现在完成时核心是“过去与现在的联系”，有两大核心用法：1. 影响/结果：过去发生的动作完成后，对现在造成了影响或留下了结果；2. 持续状态：动作从过去开始，一直持续到现在（可能继续持续）。结构公式:●肯定句：主语+have/has+动词过去分词●否定句：主语+haven’t/hasn't+过去分词●疑问句：Have/Has+主语+过去分词?标志性时间状语（必背）：见到以下词汇/短语，优先使用现在完成时：1.模糊时间副词：already（已经）、yet（还/已经）、ever（曾经）、never(从不)、just（刚刚）2.时间段状语：for+时间段（如for 10 years）、since+时间点/过去时句子（如since 2018、since I was 5)、since+时间段+ago3.强调“到目前为止”: so far、in recent years、over the last 20 years(在过去的20年里)四、核心对比一般过去时：过去的事，说清楚什么时候发生的，说完就和现在没关系了。现在完成时：和现在有关的事，不说具体什么时候发生的，重点在现在的状态 / 结果。一句话口诀：一般过去时：说的是往事，有具体时间，随风而去（不管现在）。 现在完成时：说的是现状，无具体时间，留有余痕（影响当下）。易混易错点突破易错点1：标志词混淆×错误：I have seen him yesterday.（“yesterday”是具体过去时间，不能用现在完成时）√正确：I saw him yesterday.易错点2：非延续动词与延续性动词现在完成时中，非延续性动词（如buy，die，leave，open）不能直接与for/since连用，需转换为延续性状态易错点3：when与howlong的提问区别when提问具体时间，用一般过去时： When didyou open the door? ——I opened it just now.howlong提问持续时长，用现在完成时： How long have you kept this book? ——For two weeks.1. used to do sth：过去常常，现在不做了否定式：didn’t use to do /used not to do（口语更常用 didn’t use to）疑问式：Did you use to...? / Used you to...?关键区别：和 be used to doing 完全无关，to 是不定式符号，后面必须接动词原形例：He used to smoke, but he quit last year.（他过去抽烟，去年戒了。）辨析 used to do、used to doing、use sth to do sth、be used to do sth2. be/get used to doing：习惯于…核心坑点：to 是介词！ 后面必须接 doing / 名词，不能接动词原形！例：I am used to the cold weather.（我习惯了寒冷的天气。）/ He is used to working at night.（他习惯了熬夜工作。）注意：get used to 更强调 “逐渐习惯” 的过程，be used to 强调 “已经习惯” 的状态。3. Sb.+ use sth to do sth：主动使用某物做某事主语是人，动作是主动发出的，强调 “使用者” 和 “用途” 的关系例：She uses her phone to take photos.（她用手机拍照。）4. Sth.+ be used to do sth：被动语态，某物被用来做某事是 use sth to do 的被动形式，主语是物，表某物的固有用途可以和 be used for doing sth 互换：Knives are used to cut things. = Knives are used for cutting things.注意别和 be used to doing 搞混：The pen is used to write.（笔被用来写字。→ 被动语态，表用途）I am used to writing with this pen.（我习惯用这支笔写字。→ 主动，表习惯）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.Havebeendon’t knowopenopenedwentDidlikehavevisiteddidseereadlistenedwill bringIn 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?wasbemadehave takenhas builttakewerehave improvedTalk about the changes in your hometown with simple past tense and present perfect tense.Think deeply: What brings about these changes in our lives?◆一般过去时◆现在完成时单项选择。1. My hometown ________ a lot since ten years ago.A. changed B. changes C. has changed D. will change2. I ________ live in the countryside, but now I live in the city.A. am used to B. used to C. use to D. was used to3. —Have you visited the new park in your hometown ________?—Yes, I have.A. already  B. yet C. just D. ever4. Great changes ________ in my hometown last year.A. took place B. have taken place C. take place D. will take place5. My hometown ________ be poor, but now it is very rich.A. used to    B. is used to C. was used to  D. use toCBBAAHomework✍ ✍ Write ten sentences with simple past tense and present perfect tense. Finish the exercises.