Unit 5 Grammar 课件 2025-2026学年外研版八年级英语下册

该初中英语课件聚焦8BU5宾语从句（1），核心讲解that和whether/if引导的宾语从句。课堂通过琥珀中恐龙尾巴、太阳系冥王星等科学案例导入，从阅读材料提炼语法结构，经练习、小组讨论到写作任务，构建“输入-理解-应用”的学习支架，帮助学生掌握用法。 其亮点是融合真实语境与语法教学，含“八戒帮你秒懂”视频资源直观讲解，结合恐龙羽毛、冥王星定义等科学案例，培养语言能力和思维品质。采用发现式学习，学生在分析科学现象中运用宾语从句，提升表达与逻辑思维，教师可借助完整流程和多样活动提高教学效率。

Object clause 宾语从句 (1) 8BU5 Grammar 2026.5 For a long time, people believed that dinosaurs looked like ___________. But the ____________________ tail of a dinosaur in a piece of amber has proved that it is _______. Amber can show us how life on earth _________________________. For example, a piece of amber from Northern Europe _______ a flower. This species ____________ grows in this area. But the amber proves that _________________________________. Amber also helps discover ____________________. The 13 ants _________________________changed old beliefs about the ________ of ants. Amber is seen as a window _______________. However, it’s still not _________________. If we __________________ into research, this key can be used to _____________________________. Review. huge lizards feather-covered/feathered has changed over time wrong holds no longer it did (grew there) 35 million years ago in a piece of amber from Africa unknown species history on the past fully understood put more effort unlock more secrets of nature 宾语从句：放在动词后面作宾语的句子 宾语从句 宾语从句 Read and summarize. a. For hundreds of years, people believed the saying. 主语 谓语 宾语 (b) They can tell us whether dinosaurs had feathers, but that's not all. (a) For hundreds of years, people believed that dinosaurs looked like huge lizards. 主语 b. They can tell us the answer. 谓语 主语 谓语 直接宾语 间接宾语 主语 谓语 间接宾语 引 导 词 引 导 词 1 Imagine a dinosaur in an ancient forest. It is running around, looking for its next meal. With an angry cry, it opens its mouth, raises its beautiful feather-covered arms, and... 2 Wait, feathers on a dinosaur? For hundreds of years, people believed that dinosaurs looked like huge lizards. Just look at all those dinosaurs in books, films and TV shows! However, thanks to a piece of amber, scientists now know that this idea is wrong. In the amber from Southeast Asia, they found the tail of a dinosaur -- with feathers. 3 These beautiful golden stones quietly keep pieces of the past. They can tell us whether dinosaurs had feathers, but that's not all. They also help us understand that life on earth has always changed. A piece of amber from Northern Europe, for example, holds a flower. This species no longer grows in this area. But the find proves that it did 35 million years ago. In the future, amber may also help us discover if other species have changed over time. 4 Thanks to amber, more than 300 unknown species have been discovered. In a piece of amber from Africa, scientists found 13 ants. Research shows that they are a completely new species. Scientists used to believe that ants came from the northern half of the earth. The discovery of this African species has changed old beliefs about the history of ants. Who knows whether this piece of amber will tell us more secrets? 5 As a window on the past, amber has been much studied. However, it's still not fully understood. We should put more effort into research. Then we can use this key to unlock more secrets of nature. 表示肯定或陈述内容时，用that引导宾语从句。 表示“是否”这种不确定的概念时，用if或whether引导宾语从句。 Read and learn. Watch and learn. Let’s check and summarize the structure of object clause. 主语 + 谓语 +引导词 + 从句（陈述式） Connect the sentences with that, if or whether. Scientists aren’t sure if / whether there is life in outer space. John told his parents that he wanted to be a scientist and study plants. Emily wants to know if / whether Mr Brown is interested in insects or birds. A. Seven. B. Eight. C. Nine. 1. How many planets are there in the solar system? 2. Which of the following is not a planet in the solar system? A.Uranus. B.Neptune. C.Pluto. 天王星 海王星 冥王星 Do you know? 水星 金星 地球 火星 木星 土星 天王星 海王星 Complete the messages with that, if or whether. if / whether that if / whether that that if / whether 冥王星被踢出八大行星，简单直白讲清楚 2006年天文学界重新定义行星标准，必须同时满足3条： 1. 绕太阳公转 ✅ 冥王星满足 2. 质量足够大，引力把自己拉成圆球 ✅ 满足 3. 清空轨道附近区域（轨道不能有一大堆小天体）❌ 不满足 核心原因 冥王星在柯伊伯带，周围全是小行星、冰块天体，轨道不干净，和地球、木星完全不一样。 而且它太小，比月球还轻，引力管不住周边天体。 Do you know? 1. What is Daniel’s question on the message board? Daniel saw that the museum missed Pluto in the model of the solar system. He wants to know if / whether this is a mistake. 2. Why isn’t Pluto one of the planets in the solar system? In 2006, scientists agreed that a true planet: (1) moves around the sun; (2) is round (or nearly round); (3) can clear things in its way. 3. What can you learn from the messages? People's understanding of nature keeps changing. 4. What discoveries of nature do you know? Read and answer. √ √ Pluto doesn’t meet the third point. Read the notice. People's understanding of nature keeps changing. Group work. Decide on one discovery and answer the questions. 1. What is the discovery? 2. Who made the discovery? 3. What’s amazing about it? 4. What can you learn from it? 1. What is the discovery? For hundreds of years, people believed that...; The discovery of... has changed old beliefs about...; By..., ... found / realised / saw that...; Research shows that... 2. Who made the discovery? By..., ... found / realised / saw that...; ... made an amazing discovery. 3. What’s amazing about it? It’s amazing that...; What’s amazing is that...; It proves that...; Research shows that...; ... unlock the secrets of nature. 4. What can you learn from it? It teaches us that...; I can learn that...; We should put more effort into... Group work. Decide on one discovery and answer the questions. Write your passage. Sample Let’s check in pairs. Then share in class. Evaluation criteria: • Introduce what the discovery is and who made it. • Describe what is amazing about it. • Explain what can be learnt from it. • Use the words and expressions from the reading passage and the Useful expressions. • Use object clauses correctly. 1. Aurora 北极光 发现：北极天空出现彩色光带。 误解：古人以为是神灵之火、鬼魂跳舞。 科学家发现：太阳风与地球磁场碰撞。 神奇：黑夜中发光，颜色梦幻。 学到：神秘现象多是自然科学。 2.Tumbleweed 会 “走路” 的种子 发现：风滚草干枯后会滚动。 误解：被当成神奇怪物。 科学家：为了传播种子，适应环境。 神奇：没有脚却能移动。 学到：生命为生存会改变自己。 3. Swallow 燕子低飞 发现：下雨前燕子飞得很低。 误解：人们以为是巧合。 科学家：昆虫低空飞，燕子跟着捕食。 神奇：动物能预测天气。 学到：大自然有隐藏规律。 4. Bat 蝙蝠夜间飞行 发现：蝙蝠黑夜也能飞不撞墙。 误解：被认为有魔法或夜视眼。 科学家：靠回声定位（超声波）。 神奇：不用眼睛也能 “看见”。 学到：科学能解开奇怪现象。 5. Mimos 含羞草 发现：一碰叶子就闭合。 误解：以为是有感情的神奇植物。 科学家：植物的自我保护反应。 神奇：像动物一样敏感。 学到：植物也有智慧和适应力。 6. Mirage 海市蜃楼 发现：沙漠中出现虚幻城市、湖水。 误解：以为是仙境、魔法。 科学家：光的折射形成的幻象。 神奇：看起来真实却不存在。 学到：眼睛会骗人，科学才可靠。 From misunderstanding to understanding Science is a journey, not a final answer. 2026.5 科学是一场旅程，不是最终答案。 $