Unit 1 Section A (4a-4c) 课件 2026-2027学年人教版九年级英语上册

这是一份Unit 1 Section A (4a-4c) 课件 2026-2027学年人教版九年级英语上册，共14页。
过去式过去式过去式过去分词过去分词过去分词大约20年前，他成为了你祖父的一位好朋友。他们已经很多年没见过彼此了！我们过去常常要走很远的路去看医生。我们村刚建了一家新医院。很多人过去在大城市工作。现在，他们中的更多人已经回到这里生活和工作。主语 + have / has + done1.主语+be(were,was)2.主语 + 动词过去式一般过去时现在完成时1.主语 + be (am, is, are)2.主语 + 动词原形/单三一般现在时【主语 + used to+动词原形】过去习惯/状态（现在已改变）GrammarTIMEGrammarUsed toYes, he did./No,he didn’t.She used to have curly hair.used to do表示过去习惯性的动作或经常性的状态，现在已经不存在。She is used to getting up early.be/get used to doing习惯于做某事（可用于现在、过去、将来等多种时态）The knife is used to cut fruit.be used to do被用来做某事（是被动语态, 用于多种时态）Grammar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how long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.how long提问持续时长，用现在完成时： How long have you kept this book? ——For two weeks.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 ______ (see) there?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 there tomorrow.Have beendidn’t know open opened went Do like have visited did see read listened will bring 对过去不知道某事的陈述关于科学和中国文化的书籍有声读物have been to… 去过某地（现在已经回来）询问现在的感受read 的过去式还是 readIn 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 hours. As a result, the lives of local people __________________ (improve). They are much richer and happier than they once ________ (be).was be made have taken has built take have improved were make it + adj. + to do sth.使做某事…强调对现在的影响who has helped make life better? Parents? Teachers? Workers? Thinkinghard work of many people and the support of the government.1.In Guizhou, My parents have worked hard to give me a good education.The workers have built a new park for us.2.In our hometown,ThinkingNew roads may destroy old forests. Changes can bring problems too.Not All Changes Are GoodWe should balance development with health.What should we do?Fast food restaurants – convenient but unhealthy. We should ...Summary