Unit5 Section A Grammar Focus语法课件 2025-2026学年人教版英语八年级下册

该初中英语课件聚焦过去进行时语法，通过台风登陆实时播报及自然灾害场景中人物动作（如学生上课、妈妈做饭等）导入，引导学生观察动作时间特点，进而学习定义、公式，再通过四大使用场景（具体时刻、持续时间等）和对比辨析（when vs. while、与一般过去时）构建知识支架。 其亮点在于情境化与结构化结合，以“自然灾害影响”为主题，将语法融入真实语境（如台风时的动作描述）提升语言能力；通过场景分类、对比表格引导分析动作时间关系，培养思维品质；多样化练习（填空、对话补全等）帮助掌握策略，提升学习能力。教师可依托情境激发兴趣，学生在运用中深化语法理解，提升表达准确性。

Grammar: Past continuous tense 学生们正在上课。 Students were having lessons. 妈妈正在厨房做饭。 Mother was cooking in the kitchen. 爸爸正在开车回家。 Father was driving home. 救援队正在搜救。 Rescue teams were searching for survivors. 思考问题：这些句子都描述了什么类型的时间？动作有什么特点？ When the storm came Students were having lessons. Mother was cooking in the kitchen. Father was driving home. Rescue teams were searching for survivors. 过去进行时表示在过去某一特定时间点或某一段时间内正在进行或持续发生的动作。 核心公式：was/were + 动词-ing形式 否定句：was/were + not + 动词-ing形式 疑问句：Was/Were + 主语 + 动词-ing形式 四大使用场景 场景1：过去某一具体时刻正在进行的动作 标志词：at 8 yesterday, at that moment, at this time last week 实例： At 9 p.m. last night, I was watching a movie. （昨晚9点，我正在看电影。） What were you doing at this time yesterday? （昨天这个时候你在做什么？） 练习：根据时间描述动作 When the rain started (昨天下雨时), I ____________ (walk) home. At 9 last night (昨晚9点), my family ____________ (watch) a movie. was walking was watching 场景2：过去某一段时间内持续进行的动作 标志词：from 7 to 9, all morning, the whole afternoon 实例： She was practicing the piano from 2 to 4 yesterday. （昨天2点到4点，她一直在练钢琴。） They were cleaning the house all morning. （他们整个上午都在打扫房子。） 练习：根据时间描述动作 1.During the snowstorm, people （stay）indoors. 2.While the flood waters were rising, volunteers （help）the elderly. were staying were helping 场景3：作为背景的长动作（+ when短动作） 结构：长动作（进行时） + when + 短动作（一般过去时） 实例： I was walking in the park when I saw an old friend. （我正在公园散步时，看到了一位老朋友。） They were having dinner when the phone rang. （他们正在吃晚饭时，电话响了。） 练习：根据时间描述动作 I （read）a book when the phone rang. was reading 场景4：两个同时进行的过去动作 结构：While + 进行时，进行时 实例： While mom was cooking, dad was setting the table. （妈妈在做饭时，爸爸在摆餐具。） While some students were reading, others were taking notes. （一些学生在阅读时，另一些在做笔记。） 练习：根据时间描述动作 While the typhoon （approach）, people （ board）up their windows. was approaching were boarding when vs. while 核心区别： 连词 从句动词时态 含义侧重 示例 when 一般过去时 （短动作） 时间点 When he arrived, we were eating. （他到达时） when 过去进行时 （长动作） 时间段 When I was studying, he called. （我学习期间） while 过去进行时 （长动作） 同时段 While I was studying, he was sleeping. （我学习期间他睡觉） 强调两个同时进行的持续动作 → 用 while While I was walking home, it was raining heavily. 强调在某个持续过程中发生瞬间事件 → 用 when + 进行时 When I was walking home, I saw an accident. 强调瞬间事件发生时正在做什么 → 用 when + 一般过去时 When the alarm sounded, we were evacuating. 最佳表达选择 __________ I was walking in the park, I met an old friend. The phone rang _____________ I was taking a shower. ___________ the fire alarm sounded, everyone rushed to the exits. My mother was cooking dinner ____________ my father was reading the newspaper. ____________ the typhoon hit the coastal area, many trees were blown down. When vs. While 填空专项练习 While /When While /When When while  While /When 与一般过去时的关键区别 时态 动作特点 时间焦点 示例 过去进行时 持续、进行中 未完成 过程 “正在做” I was writing a letter at 8. （8点时我正在写信。） 一般过去时 完成、结束 已发生 结果 “做了” I wrote a letter last night. （昨晚我写了一封信。） 对比分析： I was reading a book when he came in. （他进来时，我正在读书。→ 强调读书正在进行） I read a book last night. （昨晚我读了一本书。→ 强调读书这个事实） 时态填空 Last Saturday was a busy day. In the morning, I (1) ______ (help) my mom clean the house. While I (2) ______ (sweep) the floor, my phone (3) ______ (ring). It was my friend Lisa. She (4) ______ (ask) if I wanted to go shopping with her. In the afternoon, we (5) ______ (go) to the mall. While we (6) ______ (look) at clothes, we (7) ______ (meet) our English teacher, Mr. Wang. He (8) ______ (buy) a book at that time. We (9) ______ (chat) with him for a few minutes, then (10) ______ (continue) shopping. helped was sweeping rang asked  went were looking met was buying chatted continued 综合练习 动词形式转换 将括号中的动词改为过去进行时的正确形式： Yesterday at 3 p.m., I ______ (study) for the test when the power went out. While my mother ______ (cook) dinner, my father ______ (watch) the news about the typhoon. The students ______ (practice) the earthquake drill when the real quake started. What ______ you ______ (do) at 8 last night? I ______ (call) you but no one answered. It ______ (rain) heavily while we ______ (drive) to the shelter. was studying was cooking was watching were practicing were doing was calling was raining were driving 句子转换 A. 将两个简单句合并为一句，使用when或while： 1.I was reading a book. The earthquake started. → ______ 2.They were evacuating the building. The fire spread quickly. → ______ 3.The phone rang. She was taking a shower. → ______ When the earthquake started, I was reading a book. While they were evacuating the building, the fire spread quickly.  The phone rang while she was taking a shower. B. 将下列句子改为否定句和疑问句： 1.肯定句：The children were playing outside when the storm came. 否定句：______ 一般疑问句：______ 2.肯定句：We were preparing emergency supplies at that time. 否定句：______ 特殊疑问句：What ____________ at that time? 句子转换 The children were not playing outside when the storm came. Were the children playing outside when the storm came? We were not preparing emergency supplies at that time. were you doing （ ）1.What ______ you ______ at 8 last night? A. are; doing B. were; doing C. did; do D. do; do （ ）2.I ______ TV when the phone rang. A. watched B. was watching C. am watching D. watch （ ）3.While my mother ______ dinner, my father ______ the news. A. cooks; watches B. was cooking; was watching C. cooked; watched D. is cooking; is watching （ ）4.They ______ in the library from 2 to 4 yesterday afternoon. A. study B. studied C. were studying D. are studying （ ）5.______ the earthquake started, people ______ out of the buildings. A. When; run B. While; were running C. When; were running D. While; run 单项选择 B B B C C （ ）6.The children ______ outside when the storm came. A. played B. were playing C. are playing D. play （ ）7.What ______ your brother ______ while you ______ your homework? A. was; doing; were doing B. did; do; were doing C. is; doing; are doing D. does; do; do （ ）8.I ______ a shower when you called me. A. took B. was taking C. take D. am taking （ ）9.At this time yesterday, we ______ a meeting. A. have B. had C. were having D. are having （ ）10.While the firefighters ______ the fire, the police ______ people. A. fight; help B. were fighting; were helping C. fought; helped D. are fighting; are helping 单项选择 B A B C B 背景： 两个同学在回忆上周地震时的经历。 Xiao Mei: Can you believe it's been a week since the earthquake? Wang Lei: I know! I'll never forget that day. (1) ___________________________?（提示：询问对方当时在做什么） Xiao Mei: I was in the school library. (2) ______________________________ when all the books started falling off the shelves.（提示：描述自己正在进行的动作） Wang Lei: That must have been scary! I was luckier - I was on the sports field. (3) _________________________________.（提示：描述自己和同学们正在进行的活动） Xiao Mei: What did you do when the shaking started? Wang Lei: At first, (4) _____________________________________________. But then our teacher shouted for us to stay away from the buildings.（提示：我们一开始的反应是什么） Xiao Mei: How long did it take before you could contact your family? Wang Lei: About an hour. (5) _____________________________________________ when my phone finally had signal. （提示：我当时正在做什么，当手机有信号时） 补全对话 What were you doing when it hit?  I was looking for a history book We were having a basketball match. we didn't understand what was happening and just stood there.  I was waiting with my classmates in the playground 感谢聆听 批评指导 Thanks for listening $