Unit 5 Understanding ideas Grammar 课件 2025-2026学年外研版英语八年级下册

Understanding ideas Grammar Unit 5 Looking into nature Learn the basic structures and uses of object clauses with that, if and whether.(学习理解) 01 Use the grammar rules of object clauses to complete the exercises. (应用实践) 02 Write a short passage about nature discovery with the learned object clauses. (迁移创新) 03 Learning Objectives By the end of the class, students will be able to: Lead in What grammar can you notice? I guess Peter Pan was right. So I think I'll fly away. I know that I’ll be fine. 'Cause I know Peter Pan was right. 宾语从句 Presentation Let’s review 简单句句型 主语+谓语+宾语 名词、代词、动词的-ing形式或to do形式都可以作宾语, Presentation 找出下面句子的宾语 名词 I like apples. I can't find it. She finished doing her homework. He wants to go home. I hope that it will snow this winter. I believe that we shall become good friends. 代词 动词的-ing to do 句子 Object Clause 宾语从句 Presentation 宾语从句 定义 放在动词后面作宾语的句子,我们称为宾语从句。 考点 引导词 语序 时态 重点 that引导的宾语从句 whether/if引导的宾语从句 Read the sentences from the reading passage and summarise the grammar rules. 5 For hundreds of years, people believed that dinosaurs looked like big lizards. (b) They can tell us whether dinosaurs had feathers, but that’s not all. What can you find? Presentation that/whether引导的宾语从句 Object Clause Now find more sentences with these structures in the reading passage. Presentation People believed that dinosaurs looked like huge lizards. Scientists now know that this idea is wrong. They also help us understand that life on earth has always changed. But the find proves that it did 35 million years ago. Research shows that they are a completely new species. Scientists used to believe that ants came from the northern half of … Analyze the sentence structure 主句(主语+谓语) + 引导词 + 从句(主语+谓语+其他) Presentation that引导的宾语从句 核心规则 当宾语从句的谓语动词表示肯定的概念,用来陈述一个事实、观点或情况(也就是陈述句)时,一般用that引导。 1.从句是陈述句:用来告诉别人 “是什么”“怎么样”。 3.常见主句动词:know, believe, understand, prove, show, think, say, hope 等。 2.that 无实际意义:只起连接作用,只具有语法功能,目的是使读者清楚后面的句子是作前面动词的宾语的,多数情况下that可以省略。 Exercises 一、单选题 1. I know _ he is a good student. A. that B. if C. whether 2. She thinks _ this book is very interesting. A. if B. that C. whether 二、汉译英 1.我相信他会来参加聚会。 2.老师告诉我们地球绕着太阳转。 Have a try I believe that he will come to the party. The teacher told us that the earth goes around the sun. Presentation They can tell us whether dinosaurs had feathers. Who knows whether this piece of amber will tell us more secrets? Amber may also help us discover if other species have changed over. Analyze the sentence structure 主句(主语+谓语) + 引导词 + 从句(主语+谓语+其他) 当主句的谓语动词(如 ask, wonder, know, tell, want to know 等)后面需要接一个 “是” 或 “否” 的问题时,我们用 whether 或 if 来引导这个宾语从句。 Presentation whether 和 if 的主要区别 在大多数情况下,whether 和 if 可以互换使用。但在以下几种特定情况下,通常只能用 whether,而不能用 if。 情况 例句 1. 与 or not 直接连用 I don't know whether or not he will come. 2. 介词之后 It depends on whether he has time. 3. 不定式 (to do) 之前 She hasn't decided whether to go or stay. Exercises 一、单选题 1. She hasn't decided _ to go to Beijing or Shanghai. A. if B. whether C. that 2. He asked me _ I was happy with my new job. A. if B. that C. what 3. I wonder _ it will rain tomorrow. A. that B. if C. what 二、汉译英 1.我想知道他是否喜欢这个礼物。 2.她问我是否已经完成了作业。 Have a try I want to know if/whether he likes this gift. She asked me if/whether I had finished my homework. Presentation 宾语从句语序 I know that he is a student. I don't know if/whether he is a student. +引导词 主句 + 宾语从句 陈述句语序:主语+动原+其他. 无论宾语从句原来是陈述句、一般疑问句还是特殊疑问句,一旦作为宾语从句,其语序必须是 “主语 + 谓语” 的陈述语序。 Exercises 1. She asked me _. A. if I am busy B. if was I busy C. if I was busy 2. They want to know _. whether will it rain tomorrow B. whether it will rain tomorrow C. whether it rains tomorrow 3. The teacher told us _. A. that the earth goes around the sun B. that does the earth go around the sun C. that the earth went around the sun 4. I don't know _. A. if she likes swimming B. if likes she swimming C. if she like swimming Have a try Presentation 宾语从句时态 He said that he was happy. She thought that he was reading. 主句: 一般过去时 宾语从句: 一般过去时 主句: 一般过去时 宾语从句: 过去进行时 主句是_,宾语从句可以是_。 过去时 相应的过去时态 Presentation 宾语从句的时态 I know that he lives in Beijing. We believe that he will win the game. She thinks that he has gone to school. 主句是_,宾语从句可以是_。 主句: 一般现在时 宾语从句: 一般现在时 主句: 一般现在时 宾语从句: 一般将来时 主句: 一般现在时 宾语从句: 现在完成时 现在时 任何适当时态 Presentation 宾语从句的时态 The teacher taught us that practice makes perfect. He asked me if light travels faster than sound. 主句: 一般过去时 宾语从句: 一般现在时 主句: 一般过去时 宾语从句: 一般现在时 主句是_,无论主句是什么时态,从句都用_。 一般现在时 客观真理、科学事实、格言或现在仍然存在的习惯时 Presentation 考点3:时态 Exercises 1. He said _. A. that he is a student B. that he was a student C. that he were a student 2. She asked me _. A. if I will go to the park B. if I would go to the park C. if I go to the park 3.They will tell you _. A. whether the meeting starts at 8 o'clock B. whether the meeting started at 8 o'clock C. whether the meeting would start at 8 o'clock Have a try Connect the sentences with that, if or whether. 6 1. Will scientists find the reason for dinosaurs dying out? I'm not sure. Emily wants to know if / whether Mr Brown is interested in insects or birds. John told his parents that he wanted to be a scientist and study plants. I’m not sure if / whether scientists will find the reason for dinosaurs dying out. Practice 2. "I want to be a scientist and study plants," John told his parents. 3. Is Mr Brown interested in insects or birds? Emily wants to know. 是否 陈述观点 是否 Complete the messages with that, if or whether. 7 Practice if / whether that whether that if / whether that Work in pairs. Look at the notice and write a short passage about exploring nature. 8 Production Work in pairs. Look at the notice and write a short passage about exploring nature. 8 Production Use the words and expressions from the reading passage and the Useful expressions to help you. 8 Production For hundreds of years, people believed that... ... made an amazing discovery. By.... ... found / realised / saw that... It proves that... It teaches us that... Research shows that... Useful expressions: Production Example A Discovery About Whale Sounds Some whales make long, low sounds when they swim. For hundreds of years, people thought that these sounds were just random noises. They also wondered if the whales were singing to each other. By watching and listening carefully, scientists made an amazing discovery. Research shows that these low sounds are a special “language” for whales. What’s amazing is that whales can send these sounds very far under the sea. They can talk to their partners even when they are thousands of kilometres apart. It proves that whales are much smarter than we once thought. This discovery teaches us that nature is full of secrets. We should keep exploring and watching carefully. Then we will find more wonderful truths about the world around us. Exercises 单选题。 I don’t know _ he will come tomorrow. _ he comes, please tell me. A. if; That B. whether; If C. that; Whether 2. The little boy asked _ mother would buy him a new bike. A. that B. if C. what 3. Scientists believe _ humans can live on Mars in the future. A. if B. that C. whether 4. I am not sure _ they can finish the work on time. A. that B. what C. if 5. He told me _ he had never been to Paris. A. if B. that C. whether Must do: 1.记忆本节课的单词和短语,重点句型; 2.完成课后的相关练习。 Choose to do: Task: Mini-talk – A Window on the Past 主题:琥珀之外的自然之窗 请你准备一段1-2分钟的英文微型演讲,向大家介绍一种帮助我们了解过去的自然物或自然现象,例如:琥珀、化石、年轮、冰芯、洞穴壁画等。 要求:使用至少2个宾语从句,引导词包括 that, if 或 whether。可以参考课文中的句型。 Homework Homework Thank you $