Unit 4 Section A Grammar Focus课件 2025-2026学年人教版英语八年级下册

Section A Grammar Focus Unit 5 Nature’s Temper Learning goals 1. 观察并归纳过去进行时的结构（was/were + doing）及其基本用法，理解其表示过去某一时刻或时间段正在进行的动作。 2. 理解并区分 when 和 while 在引导时间状语从句时的不同用法（when 后接短暂性动作或同时性动作，while 后接持续性动作）。 3. 能正确运用过去进行时描述过去某个时刻正在发生的事情。能用 when 和 while 连接两个同时发生的动作，并能根据语境选择合适的连词。 4. 能完成课本 4a–4c 的语法练习，并在情境中准确使用目标语法。 过去进行时的句型 肯定句 主语+be (was/were)+现在分词+其他 E.g. She was playing the piano when the bell rang. When I came home, they were cooking in the kitchen. 否定句 主语+be(was/were)+not+现在分词+其他 E.g. He wasn’t reading when I came home. When he knocked at the door, we weren’t doing our homework. 一般疑问句 Be (Was/Were)+主语+现在分词+其他? E.g. A: Were you cooking at that time? A: Was he singing then? B: Yes, he was. / No, he wasn’t. B: Yes, I was. / No, I wasn’t. 特殊疑问句 疑问词+be (was/were)+主语+现在分词+其他? E.g. A: What was he doing when I called you? B: He was studying at the library. A: What were you doing when the teacher came in? B: We were discussing the homework. 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，at the time当时， at the time of..在...的时候 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) TV. 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 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. were staying 场景3：两个动作同时进行 while + 过去进行时，主句用过去进行时 核心逻辑：在一个动作进行的过程中，另一个动作也正在发生。  While my dad was watching TV, my mon was cooking dinner.    练习：根据时间描述动作 -  While you were sleeping, I _________ (do) my homework. was doing 、 while引导的时间状语从句 while Summary while只表示一段时间； while引导的时间状语从句中的动词必须是延续性动词； 强调从句和主句的动作同时发生，两句都用过去进行时，多用while引导从句。 While he was reading in the library, the rainstorm came. They were singing while we were dancing. 场景4：一个动作打断另一个动作 过去进行时 + when + 一般过去时 （最常考） 核心逻辑：一个持续的长动作（过去进行时），被一个短暂的突发动作（一般过去时）打断。   We were driving home when the strong winds started.  They were reading in the library when the rainstorm came.  练习：根据时间描述动作 -    When my neighbour ________ (call), my family were having dinner.  called 、 when引导的时间状语从句 when When we were singing, she came in. It was snowing when we arrived at the station. Summary when既指时间点，又指时间段； when引导的时间状语从句中的动词可以是瞬间性动词，也可以是延续性动词； when引导的时间状语从句常用一般过去时，也可以用过去进行时。 连词when/while 辨析 记忆口诀： when后“可长可短”（过去进行时、一般现在时都可以） while后“只能长”（只能用过去进行时）,当两个动作都是“长动作”（过去进行时），用while 易错题（when/while 辨析） 选择正确的连词填空。 1. ______ I was walking in the park, I saw a cat. 2. He was listening to music ______ his mother came in. 3. ______ the storm started, we were eating dinner. 4. My sister was doing her homework ______ my brother was playing games. 5. ______ she was cooking, the phone rang. Practce 4b Combine each pair of sentences using when or while. 1. I did my homework. The typhoon landed on the coast. I was doing my homework when the typhoon landed on the coast. 2. The power went out. My father and I made dinner. My father and I were making dinner when the power went out. 3. Kate wrote a letter. Her brother called to warn her of the storm. Kate was writing a letter when her brother called to warn her of the storm. 4. My parents packed the supplies. I moved our things off the floor. My parents were packing the supplies while I was moving our things off the floor. 5. I slept soundly. It rained cats and dogs. I was sleeping soundly while it was raining cats and dogs. rain cats and dogs 是一个常用的英语俚语，意为 “下着倾盆大雨”。 was While were When were 4d Imagine that you are a reporter. Interview a member of Jenny's family and find out what he or she was doing around the time of the tornado. A: What were you doing when the tornado hit? B: My family and I were hiding in a safe room. A: What were you doing while you were waiting there? B: Oh, while I ... Sample A: What were you doing when the tornado hit? B: My family and I were hiding in a safe room. A: What were you doing while you were waiting there? B: Oh, I was holding my little sister to keep her calm, while my dad was telling us stories. A: What happened when you came out? B: When we walked outside, we saw our neighbours. They were cleaning up the broken branches in their yard while we were checking our own house. Everyone was helping each other. $