Unit4单元语法课件 2025-2026学年人教版英语八年级下册

该初中英语课件聚焦比较级、最高级及大数字表达，通过“温故知新”环节以中文例句衔接旧知，再以分类表格、句型总结搭建学习支架，系统呈现变形规则、核心句型及自然奇观相关大数字应用。 其亮点在于结合自然奇观创设真实语境，通过三类变形表格、易错点辨析培养思维品质，用珠穆朗玛峰比较句、三大河流最高级句提升语言能力。练习设计循序渐进，学生能高效掌握语法并用于实际表达，教师可直接利用结构化内容提升教学效果。

Grammar: Comparative and superlative adjectives / adverbs (review) Large numbers 温故知新 我哥哥比我高。 My brother is taller than me. 这本书比那本书更有趣。 This book is more interesting than that one. 她是我们班最聪明的学生。 She is the smartest student in our class. 这是我见过最美的公园。 This is the most beautiful park I have ever seen. 你练习得越多，英语就会说得越好。 The more you practice, the better you will speak English. 这座城市正变得越来越现代化。 This city is becoming more and more modern. 这座城市正变得越来越现代化。 He is one of the most famous singers in China. 这台电脑比那台贵一倍。 This computer is twice as expensive as that one. 形容词/副词比较级与最高级变形 第一类：直接加 -er/-est（单音节 & 部分双音节） 原级 比较级 最高级 规则说明 tall taller tallest 直接加-er/-est large larger largest 以-e结尾，加-r/-st big bigger biggest 重读闭音节，双写末尾辅音 heavy heavier heaviest 以辅音+y结尾，变y为i加-er/-est narrow narrower narrowest 以-ow结尾，直接加 第二类：前加 more/most（多音节 & 部分双音节） 原级 比较级 最高级 音节数 beautiful more beautiful most beautiful 3音节 carefully more carefully most carefully 3音节 famous more famous most famous 2音节（常用more） boring more boring most boring 2音节（常用more） 第三类：不规则变化 原级 比较级 最高级 记忆要点 good/well better best "好"的不规则 bad/badly worse worst "坏"的不规则 far farther/further farthest/furthest 距离/程度两用 many/much more most 数量比较 little less least 少量比较 old older/elder oldest/eldest 年龄/长幼两套  易错点辨析 farther vs further： farther：实际距离更远（The hotel is farther than I thought.） further：程度更深（We need further discussion.） older vs elder： older：用于比较年龄（My brother is older than me.） elder：用于家庭成员长幼（my elder sister） high → ______ → ______ big → ______ → ______ happy → ______ → ______ thin → ______ → ______ early → ______ → ______ beautiful → ______ → ______ carefully → ______ → ______ important → ______ → ______ 写出比较级和最高级 good/well → ______ → ______ bad/badly → ______ → ______ many/much → ______ → ______ little → ______ → ______ far → ______ → ______ higher → highest bigger → biggest happier → happiest thinner → thinnest earlier → earliest more beautiful → most beautiful more carefully → most carefully more important → most important better → best worse → worst  more → most less → least farther/further → farthest/furthest 句型结构全解 比较级的5大核心句型 ① 基础比较：A + be/动词 + 比较级 + than + B The Sahara is larger than the Gobi Desert. He runs faster than his brother. ② 程度修饰：much/far/a lot/a little/slightly + 比较级 Mount Qomolangma is much higher than Mount Tai. This river is a little longer than that one. ③ 越来越...：比较级 + and + 比较级 The weather is getting hotter and hotter. She runs faster and faster. ④ 越...就越...：The + 比较级..., the + 比较级... The higher you climb, the colder it gets. The more you practice, the better you'll be. ⑤ 倍数比较：... times + 比较级 + than... The new building is three times taller than the old one. This lake is twice as deep as that lake. 用比较级或最高级完成句子： The Yangtze River is ______ (long) than the Yellow River. Mount Qomolangma is ______ (high) mountain in the world. This problem is ______ (difficult) than that one. She sings ______ (beautifully) of all the students. Today is ______ (cold) than yesterday. 基础句型填空 longer  the highest more difficult most beautifully colder 最高级的4大核心句型 ① 基础最高：the + 最高级 + in/of... It's the deepest trench in the ocean. She is the tallest of the three sisters. ② 序数词+最高级：the + 序数词 + 最高级 The Yellow River is the second longest river in China. This is the third largest desert in the world. ③ 否定最高：one of the + 最高级 + 复数名词 The Amazon is one of the longest rivers in the world. This is one of the most amazing places I've visited. ④ 最高级副词可省略the Who runs (the) fastest in your class? I like this story (the) best. 同级比较的3种表达 ① 肯定同级：as + 原级 + as Lake Baikal is as deep as 1,620 meters. He speaks English as fluently as a native speaker. ② 否定同级：not as/so + 原级 + as The Nile is not as long as the Amazon. She doesn't study as hard as her sister. ③ 倍数同级：... times + as + 原级 + as... This room is twice as large as that one. The new bridge is three times as long as the old one. The weather is getting ______ and ______ (hot). The city is growing ______ and ______ (modern). The children are becoming ______ and ______ (independent). ______ (much) you practice, ______ (good) your English will be. ______ (high) you climb, ______ (cold) it gets. This building is _______________ (three times/tall) that one. The new road is _______________ (twice/long) the old one. The Amazon is __________________ (long/river) in the world. 基础句型填空 hotter hotter more more modern. more more independent The more the better The higher  the colder three times taller than twice as long as one of the longest rivers 大数字表达 比较级的5大核心句型 个位 → 十位 → 百位 → 千位 → 百万 → 十亿 → 万亿 ones → tens → hundreds → thousands → millions → billions → trillions 核心规则详解 三位分割法 每三位一个逗号 1,000 → one thousand 1,000,000 → one million 1,000,000,000 → one billion 读法规则 ①：百位与十位间加"and"（英式） 325 → three hundred and twenty-five 1,416 → one thousand, four hundred and sixteen ②："teen" vs "ty" 辨析 13 thirteen / 30 thirty 14 fourteen / 40 forty 15 fifteen / 50 fifty 16 sixteen / 60 sixty 17 seventeen / 70 seventy 18 eighteen / 80 eighty 19 nineteen / 90 ninety ③：整数末尾零不读 9,000 → nine thousand 500,000 → five hundred thousand ④：小数点读作"point" 8,848.86 → eight thousand, eight hundred and forty-eight point eight six 3.14 → three point one four 8,848.86 meters（珠穆朗玛峰高度）_______________ 11,034 meters_______________ 9,200,000 km²（撒哈拉沙漠面积）_______________ 4,340 km²（青海湖面积）_______________ 5,464 km（黄河长度）_______________ 读出下列数字 eight thousand, eight hundred and forty-eight point eight six meters eleven thousand and thirty-four meters nine million, two hundred thousand square kilometers four thousand, three hundred and forty square kilometers five thousand, four hundred and sixty-four kilometers 比较级展示 珠穆朗玛峰 vs 乔戈里峰 珠穆朗玛峰：8,848.86 m 乔戈里峰：8,611 m 比较句： 1.（珠穆朗玛峰比乔戈里峰高得多。） 2.（攀登珠峰比攀登乔戈里峰更具挑战性。） Mount Qomolangma is much higher than K2. Climbing Mount Qomolangma is more challenging than climbing K2. 最高级展示 三大河流排名 尼罗河：6,671 km 亚马孙河：6,400 km 长江：6,300 km 最高句： 1.长江是中国最长的河流。 2.它是世界第三长河流。 3.它是亚洲最重要的水道之一。 The Yangtze River is the longest river in China. It is the third longest river in the world. It is one of the most important waterways in Asia. 比较级&最高级 大数字 Grammar 变化 句型 规则：-er/-est 或 more/most 不规则：good→better→best / bad→worse→worst 比较：A比B更... (than) 最高：...中最... (the...est in) 越...越... (The more..., the more...) 同级：和...一样 (as...as)/one of the 最高级 地理数据 读法 三位分：1,000 (thousand) and：百位十位间 小数点：point 感谢聆听 批评指导 Thanks for listening $