Unit 5 Section A（4a-4d)课件-2025-2026学年人教版八年级英语下册

Nature’s Temper Nature’s Temper Nature’s Temper Section A –What happens during a natural disaster? Unit 5 八年级下册英语人教版 第三课时 4a-4d Learning Objectives In this lesson you will: 1. understand the form and function of the past continuous tense. 2. differentiate the use of “when” and “while” in past continuous tense. 3. apply the past continuous tense orally and in writing. 1. I________ 16 years old this year. 2. I________ 15 years old last year. 3. How________ the weather today? 4. How________ the weather yesterday? 5. They________ good friends. 6. They________ good friends three years ago. am was is was are were Fill in the blanks with “be”. 3 3 写出过去式 grow grew tell take think get ring shop told took thought got rang shopped become run fall buy make cut sleep ran fell bought made cut became slept mean fly hear eat go leave meant flew heard ate went left What were you doing while it was snowing heavily? I was travelling on the train then. What were your family doing when the typhoon hit? My children and I were reading together. When my neighbour called, my family were having dinner. We were driving home when the strong winds started. While we were driving home, the strong winds started. It was raining hard while we were driving back. Read the sentences. Underline the verbs which show an ongoing action in the past. 4a Think and Discuss What are the differences between when and while when used in past continuous tense? What were you doing while it was snowing heavily? What were your family doing when the typhoon hit? When my neighbour called, my family were having dinner. While we were driving home, the strong winds started. It was raining hard while we were driving back. What was/were... doing at 6:00 last night? I/He/She was/ They were... 1. 概念：表示过去某一时刻或某段时间内正进行的动作。 2. 构成：was/were + 动词现在分词 3. 用法： A：表示某一时刻正进行的行为，与特定的过去 时间状语连用，常见的时间有：at 8 last night, at this time, at that time, at that moment 等。 过去进行时 2. 现在分词的构成 3. 1)一般动词在词尾加-ing，如： go→going 2)以不发音字母e结尾的动词， 先去掉e，再加-ing come→coming   make→making   write→writing 3)以重读闭音节结尾的动词，如果末尾以一个辅音字母结尾，应先双写这个字母，再加-ing，x和w结尾的除外。 get→getting     swim→swimming  show→showing 9 4)以字母y结尾的单词，直接加-ing。如： 5)以字母ie结尾的动词，变ie为y，再加-ing。 6)以元音字母加e结尾，或以e结尾，且e发音的动词，直接加-ing。  carrying playing studying    die→dying  lie →lying     see→seeing be→being 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. 过去进行时中when和while的区别 when可以表示时间点，也可以表示时间段，后面既可以+延续性动词，也可以+非延续性动词，时态既可以是一般过去时，也可以是过去进行时。 E.g. I was sleeping when the doorbell rang. When I was reading English words, my mother came in. while仅表示时间段，引导表示过去的时间状语从句时，从句的动词必须是延续性动词，时态用过去进行时。 E.g. He fell asleep while he was watching TV. The fire alarm went off while we were having a meeting. 主句（瞬间动作）+ while + 从句（持续动作） 当主句和从句都为过去进行时，只能用while引导，不能用when。 E.g. We were playing basketball while it was raining. I was reading while she was writing. 主句（持续动作） + while + 从句（持续动作） 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） 两个动作都是“长动作”（过去进行时），用while 1)过去进行时表示过去某一时刻或某一段时间正在进行的动作，而一般过去时则表示在过去某个时间发生过的动作或存在的状态。如： 过去进行时和一般过去时的区别 5. They were writing letters to their friends last night. 昨晚他们在写信给他们的朋友。 They wrote letters to their friends last night. 他们昨晚写了信给他们的朋友。 (没有说明信是否写完) (表达了他们已写好的意思，整个写的过程已完成) 2)当动作延续较长时间时或表示厌烦、赞美等感情色彩时，常用过去进行时表示。如： He was thinking more of others than of himself. 他考虑别人的比考虑自己的多。 The boy was always making trouble then. 那时，他总是惹麻烦。 (表示说话者赞扬的口气) (表示说话者厌烦的口气) 现在进行时 含义：表示现在正在进行的动作。 结构： is/am/are + doing 例句： I am having an English class. 过去进行时 含义：表示过去某个时刻正在进行的动作。 结构： was/were + doing 例句： I was having an English class at this time yesterday. — Why didn’t you open the door for me, Jim? — I clothes in the bathroom. I didn’t hear the knock. A. am washing B. have washed C. was washing D. washed 中考链接 ——吉姆，你为什么没有给我开门？ ——（当时）我在浴室洗衣服，没有听到门铃声。 过去的某个时间，要用过去进行时。 过去进行时和一般过去时的区别 一般过去时只表示一个完成的动作，而过去进行时表示过去某时正在进行的动作。也就是说，用一般过去时只是表示有过这件事；用过去进行时则强调了动作的连续性。 E.g. The children watched TV yesterday night.（只说明昨晚孩子们看过电视，但看了多长时间并不知道。） The children were watching TV yesterday evening.（不仅陈述昨晚孩子们看电视这一事实，更强调他们看电视的时间贯穿昨晚整个时间段。） 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. Combine each pair of sentences using when or while. 4b 4. My parents packed the supplies. I moved our things off the floor. 5. I slept soundly. It rained cats and dogs. While my parents were packing the supplies, I was moving our things off the floor. When I slept soundly, it was raining cats and dogs.  rain cats and dogs 下倾盆大雨 24 When Jenny looked up, thick black clouds were forming in the sky, and the rain beating against their roof. “Quick, this way,” said Dad. The family ran to the safe room at once. they were waiting, Jenny’s little sister started to cry. Dad gave her some chocolate and told her that they hiding from an angry lion. Soon, she was laughing again. At last, the storm passed. they stepped outside, they found the sun shining. People were asking one another if they were safe while some starting to clear the streets. Jenny smiled. The tornado was scary, but it also brought everyone closer together. was were While When  were 4c Complete the passage with was, were, when, or while. 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. 4d 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… 例如： 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 was waiting there, I started to cry. Then Dad gave me some chocolate and told me that we were hiding from an angry lion. Soon, I laughed again. 过去进行时的基本用法 过去进行时的基本句式 过去进行时 Summary 过去进行时和一般过去时的区别 was/were+动词-ing ①表示过去某一段时间内一直进行的动作，常与the whole day、all day yesterday等连用 ②表示过去某一时刻正在进行的动作，常与at 3 o’clock yesterday、aftenoon、at this time yesterday等连用 Exercise 请用 when 或 while 填空。 1. I was reading a book ______ the phone rang. 2. ______ I was reading a book, my sister was watching TV. 3. He fell asleep ______ he was listening to music. 4. ______ I arrived home, it started to rain heavily. 5. Please don’t talk so loudly ______ others are working. 6. What were you doing ______ the teacher came in? 7. ____________ I lived in the countryside, I learned a lot about farming. when While while When while when When/While Homework Use "when" and "while" to make three sentences each. 2. Describe things that Jenny’s family do during the typhoons. 3. Master the words in this lesson and preview next part. $