Unit 5 Looking into nature Grammar课件-2025-2026学年外研版英语八年级下册

该初中英语课件聚焦宾语从句语法，核心知识点包括that、if/whether引导的用法及时态规则。课堂导入通过识别名词、代词等不同类型宾语引出宾语从句概念，结合阅读文章例句总结规则，再以更多实例巩固，搭建从基础识别到规则应用的学习支架。 其亮点在于融合语言能力与思维品质培养，通过对比that与if/whether的用法差异（如whether与or not连用等情况）引导学生分析辨析，结合自然主题设计“自然秘密报告”写作任务，要求使用至少2个宾语从句。采用“识别-总结-应用”的教学方法，学生能在真实语境中提升语言运用能力，教师可借助清晰的步骤和丰富实例提高教学效率。

Unit 5 Looking into nature Grammar In this lesson, you will: 1. master the usage of the objective clauses with that, if or whether. 2. use object clauses correctly when writing a short passage about nature exploration. ① I need a pen. ② John helped her. ③ Children stopped talking. ④ I do not want to cry. ⑤ He knew (that) he should study hard. 名词 代词 V-ing形式 动词的 to do形式 句子 在主从复合句中充当宾语的句子称为宾语从句。 宾语表示动作行为的对象，常跟在及物动词或介词之后。 试着找出下列句子中的宾语。 (a) 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. Read the sentences from the reading passage and summarise the grammar rules. that 引导的宾语从句 whether 引导的宾语从句 Now find more sentences with these structures in the reading passage. However, thanks to a piece of amber, scientists now know that this idea is wrong. They also help us understand that life on earth has always changed. In the future, amber may also help us discover if other species have changed over time. Research shows that they are a completely new species. Who knows whether this piece of amber will tell us more secrets? Grammar Rules 在复合句中作宾语的从句叫宾语从句, 它通常位于主句谓语动词（及物动词）或介词之后。基本形式为：主句的主语+主句的谓语+引导词+宾语从句。 e.g. I believe that we can achieve the goal. e.g. Can you tell me how I can get to the nearest subway station? e.g. I wonder if/whether Grace has finished her homwork. 根据引导词的不同，宾语从句可分为以下三种： 1. 由that引导的宾语从句； 2. 由if/whether引导的宾语从句； 3. 由疑问词引导的宾语从句： what, which, who, whom, whose (疑问代词) when, where, how, why (疑问副词) 宾语从句 2) I believe that April is the hottest month in Thailand. 1) I know that the Water Festival is really fun. 主语 谓语 主语+谓语动词+that引导的宾语从句 (一) that引导的宾语从句 1. 结构： 并非所有动词后面都可接that引导的宾语从句。常接that引导的宾语从句的谓语动词有：believe, expect, explain, feel, hear, hope, imagine, prefer, promise, report, say, see, tell, think, understand, warn, wish 等。 (陈述语序) that无任何词义，只起连接作用，在非正式文体中可以省略 2. whether/if 引导的宾语从句 当宾语从句的语义相当于一个一般疑问句时, 常用if / whether 引导, 表示 “是否” 。if / whether在句中不充当句子成分, 但不 能省略。宾语从句要用陈述句语序。 e.g. I wonder if / whether you want to attend the meeting. She didn’t say if her aunt was still with them. I don’t know whether you like flowers. 以下情况只能用whether： 与or not 连用时，只能用whether。 e.g. I’m wondering whether I should go to the party or not. 在介词后只能用whether。 e.g. They are talking about whether the boy can win the game again. 与动词不定式连用时，只能用whether。 e.g. I can’t decide whether to buy the shoes. ① I think (that) he'll return in an hour. ② He said (that) he missed us very much. ③ Mary asked me whether/if I could help her. ④ We knew (that) summer is after spring. 宾语从句的时态取决于主句的时态: 1. 主句使用现在时，从句可使用任何时态； 2. 主句使用过去时态，从句使用相关的过去时态。 3. 当宾语从句是客观真理或不可改变的自然现象时，宾语从句须用一般现在时。 (三) 宾语从句的时态 Scientists aren’t sure John told his parents Mr Brown is interested in insects or birds. if / whether there is life in outer space. that he wanted to be a scientist and study plants. if / whether Emily wants to know 一般疑问句，表示“是否”，用if或whether引导 肯定句，表示肯定或陈述内容，用that引导 一般疑问句，表示“是否”，用if或whether引导 一般过去时 Complete the messages with that, if or whether. MESSAGE BOARD Hello, I went to your museum today. You missed Pluto in the model of the solar system. There were only eight planets in it. I don't know ¹___________this is a mistake. if/whether Dear Daniel, In the past, people thought 2__________there were nine planets. However, questions were raised about 3_________ Pluto was a planet. In 2006, scientists agreed 4__________ that whether that a true planet: 1. moves around the sun 2.is round (or nearly round) 3. can clear things in its way Pluto doesn't meet the third point. Therefore, we now believe 5_________ there are eight true planets in the solar system. That's why Pluto isn't part of the model. Please let me know 6_________ you need more information. that if/whether that if whether 1. The report says ______ this amber formed in a warm forest long ago. 2. We don’t know _________ the old ant could climb trees or not. 3. They are talking about __________ they can find more amber near the hill. 4. I believe ______ our team will win the game. 5. She wonders _________ the dinosaur feather in the amber is kept well. that whether whether that if/whether You are Nature Secret Reporters. Work in pairs. Write a 4-5 sentence report about natural secrets in amber. You should use at least 2 object clauses with that/if/whether. Steps: Talk with your partner. (What secret did amber tell first? What other secrets were found in amber? What do scientists wonder about future amber?) Write your report together(4-5 sentences). Check your work. (Do you include two object clauses with that/if/whether?) Be a Nature Secret Reporter! Good news for nature lovers! Today, we’ve learned about the amazing secrets in amber. Scientists have proved that dinosaurs once had feathers—a surprising fact found in Southeast Asian amber. Also, a piece of European amber showed that a flower species once grew there 35 million years ago. These secrets help us understand nature better! We wonder whether more unknown species will be discovered in amber in the future. Work in pairs. Look at the notice and write a short passage about exploring nature. Use the words and expressions from the reading passage and the Useful expressions to help you. P72 Useful expressions 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... Sample Must do: Polish your passage about exploring nature Choose to do: Review the usage of object clauses with that, if or whether, then make a mind map. Homework $