Unit4 Section A（4a-4d)课件 2025-2026学年人教版八年级英语下册

该初中英语课件聚焦形容词和副词比较级、最高级的构成规则与用法，及较大数字表达。通过“谁是班上最有趣的人”等游戏互动和句子圈画活动导入，从具体语境感知到规则归纳，搭建“感知—分析—应用”的学习支架。 其亮点是以自然奇观为主题语境，融合语言能力与思维品质培养。通过河流长度对比等实例归纳比较级“than”、最高级“one of the+最高级”等用法，搭配不规则变化表和语法知识导图系统梳理。分层作业提升学习能力，学生能在真实情境中运用语法，教师可借助多样化活动提高教学效率。

Let’s enjoy some natural wonders of the world. Section A 4a—4d Unit 4 The Wonders of Nature 通过听读例句、分析结构等方式，获取并正确认读形容词和副词比较级、最高级的构成规则（规则变化、不规则变化）及核心用法相关词汇与句式（如bigger, the biggest, more amazing等），感知比较级与最高级的语法特征；（学习理解） 01 通过完成句式填空、改写句子、编写比较类问题等练习，获取比较级与最高级在描述事物特征、动作程度时的关键用法，归纳并内化“比较级+than”“one of the+最高级+可数名词复数”等常用表达；（应用实践） 02 通过讨论、问答互动等活动，理解比较级与最高级在实际交际中描述事物差异、进行对比的意义，能够主动运用该语法结构描述身边的人或事物，并认同准确运用比较句式能让表达更丰富的语言理念。 （迁移创新） 03 学习目标 friendly sing well hard-working popular thin talented smart funny A: Who is the funniest in your class? B: … A: Who is the thinnest in your class? B: I think … I want to know you! Let’s play a game! 4a Read the sentences. Circle the adjectives which compare things. Underline the adverbs which compare actions.. the Yangtze River 长江 6300 km the Amazon River 亚马逊河 6440 km the Nile 尼罗河 6670 km long longer longest The Amazon River is longer than the Yangtze River. The Nile is longer than the Amazon River. The Nile is the longest of all. 概念理解 比较级：_____者比较。 最高级：_____者或_____者以上比较。 两 三 三 Presentation 1.比较级和最高级的基本概念 概念：用来修饰名词的形容词或者修饰动词的副词，会因为修饰程度不同而有所“比较”，可分为原级，比较级（更......）与最高级（最......）。 Presentation 3.比较级的用法 形容词或副词的比较级+than The Changjiang River is longer than it.长江比它长。 Bill runs faster than any other boy in his class.比尔跑得比班上其他任何男孩都快。 “比较级+and+比较级(单音节词和部分双音节词)”或“more and more+原级(多音节词和部分双音节词)”表示“越来越……”。 Summer is coming. It's getting hotter and hotter.夏天就要来了。天越来越热了。 “the +比较级...，the+比较级..”表示“越……,就越……”。 The more you read, the more you know.你阅读得越多,知道的就越多。 Presentation 3.比较级的用法 the + 比较级 + of the two (+ 名词复数) 表示“两者中较……的那个”。 Mike is the taller of the two boys. 迈克是两个男孩中较高的那个。 Which/Who... + 比较级, A or B? 表示“ A和B哪个/谁更……？” Which city is larger, Beijing or Shanghai? 北京和上海，哪个城市更大？ A + be + 倍数 + 形容词比较级 + than + B 表示“A是B的……倍……”。 Our school is three times bigger than yours. 我们学校是你们学校的三倍大。 Presentation 4.最高级的用法 (the+)最高级(+名词)+in/of 短语， 意为“……中最……的”。 I think spring is the best time of a year. 我认为春天是一年中最好的时节。 Tom works (the) hardest in Class3. 在三班汤姆学习最努力。。 one of the +形容词最高级+可数名词复数+in/of 短语，意为“……中最……的……之一”。 Hangzhou is one of the most beautiful cities in the world. 杭州是世界上最美的城市之一。 the +序数词+形容词最高级+可数名词单数+in/of 短语, 意为“在…中是第几……的……” As we all know, the Yellow River is the second longest river in China. 众所周知,黄河是中国第二长河。 “Which/Who...(the+)最高级，A,B or C?” 意为“哪个/谁是最......,A,B还是C？”。 Who sings best in your class, Lily, Tom or Jack? 你们班谁唱得最好，莉莉，汤姆还是杰克？ This is my worst performance. She is Lucy’s best friend. Reminder: 如果最高级前有形容词性物主代词或名词所有格等修饰语时则不再用定冠词the。 2.最高级的常用结构 （1）the + 形容词或副词最高级 + in / of 短语 ……中最……的 Tom is the tallest in his class. Tom runs (the) fastest of all the students. Practice （2）序数词与最高级结合 The Yangtze River is the third longest river in the world. （3）one of the + 形容词或副词最高级 +名词复数 表示“最……之一” Beijing is one of the largest cities in the world. （4）特殊疑问句中的最高级 Which animal jumps the highest, the lion, the monkey, or the tree frog? Who is the kindest person in your family? （5）比较级表达最高级的含义 Julia is taller than any other girl in her class. =Julia is the tallest girl in her class. Practice Practice 用所给词的适当形式填空 1.The Yellow River is _________ (long) than the Huaihe River. 2.Mount Tai is the _________ (high) of the two mountains in Shandong. 3.The sea is getting more and more _________ (beautiful) with environmental protection. 4.This lake is the _________ (deep) in our province. 5.Which is _________ (long), the Amazon River or the Nile River? 6.This river is three metres __________ (wide) than that one. 7.Hainan Island is the second __________(large) island in China. 8.The sunset over the ocean is one of the _______________ (amazing) sceneries in the world. longer higher beautiful deepest longer wider largest most amazing 不规则变化 good －better－best well－better－best bad－worse－worst many, much－more－most far－farther－farthest (距离远) far－further－furthest (程度深) old－elder－eldest (长幼) old－older－oldest (年龄) Practice Practice 1.big __________ _________ 2. high __________ __________ 3. low __________ __________ 4. deep __________ __________ 5. easy __________ __________ 6. far __________ __________ 7. happy __________ _______ 8. loud __________ __________ 9. great __________ __________ 10. close __________ __________ 11. amazing_______________ ________________ 12. interesting______________ ________________ 13. well __________ __________ 14. little __________ __________ 写出下列单词的比较级和最高级 bigger biggest higher highest lower lowest deeper deepest easier easiest farther farthest happier happiest louder loudest greater greatest closer closest more amazing most amazing more interesting most interesting better best less least Practice 1.—Which is ______ natural wonder in the world, the Grand Canyon, the Sahara Desert or the Great Barrier Reef? —I think the Grand Canyon is. A. great B. greater C. the greatest D. more great 2.The Yangtze River is one of ______ rivers in the world. A. long B. longer C. the longest D. most long 3.The forest is becoming ______ because more trees are planted every year. A. greener and greener B. green and green C. more and more green D. greenest 4.This waterfall is ______ of the three in this area. A. the most beautiful B. more beautiful C. beautifuler D. beautifulest 单项选择 C C A A Can you say a number bigger than 10? one hundred 100 two hundred and seventy-eight 278 four hundred and fifty-one 451 7274 ? Practice 较大数字的表达与读法 1. 从数字的右端向左数，每三位数加一个逗号。 2. 从右向左，第一个逗号处读thousand(千)，第二个逗 号处读million(百万)，第三个逗号处读billion(十亿)。 3. 读的时候通常在hundred后加and，如果百位数为0， 则在thousand后加and。 大于一千的基数词的表达法 Practice 4.英语中没有直接表示“万”和“亿”的单位词，而要用thousand 和million来表达，如“一万”用“ten thousand”、“一亿”用“one hundred million”。 2,674→two thousand six hundred and seventy-four 164,213,430→ one hundred and sixty-four million, two hundred and thirteen thousand, four hundred and thirty 18,357,089→ eighteen million, three hundred and fifty-seven thousand, and eighty-nine 5,204,000,000→five billion two hundred and four million Practice Practice 写出或读出下列数字。 2,674 → ______________________________________________ 164,213,430 → ________________________________________ _________________________________________ 18,357,089 → _________________________________________ __________________________________________ twenty-eight thousand, six hundred and fifty-six ___________ forty million, four hundred and twenty-four thousand _______ two thousand six hundred and seventy-four one hundred and sixty-four million, two hundred and thirteen thousand, four hundred and thirty eighteen million, three hundred and fifty-seven thousand, and eighty-nine 28,656 40,424,000 1.Mount Kilimanjaro is________ (five thousand, eight hundred and ninety-five) metres high. 2.__________ (twenty-five thousand, seven hundred and sixty- eight) cubic metres of water pours down Inga Falls each second. 3.The East African Rift Valley is about 4,000 (______________) miles long. 4.The Taklimakan Desert has a total area of about 337,000 (____________________________________) square kilometres. 5, 895 three hundred and thirty-seven thousand 4b Write or spell out the numbers. 25, 768 four thousand 总面积为…… Practice My friends and I visited Victoria Falls in Africa last year. Visiting one of the world’s_________ waterfalls was a magical experience. As we went_________ to the falls, the noise of the water slowly grew louder and_________. Then, right before our eyes, the waterfall appeared. It went on for as_______ as the eye could see. Later, we sat in a special pool at the top of the falls. There, we felt the water rush past us and become a part of the waterfall. It was the scariest but also the______________ experience of our trip!  largest most amazing closer louder far  极目所尽 4c Complete the passage with the correct forms of the words in the box. large 　amazing　 far　 close 　loud 4d Write some questions to compare places. Then ask a partner your questions. What is the highest...? Which park is bigger, ... or ...? Practice 1) Mount Qomolangma is_________than any other mountain in the world. 2) The Sahara Desert is_____________ desert in the world. 4) The Nile is____________ river in the world. 6) — Did you know that China is one of___________ countries in the world? — Yes, I did. It’s_______ _______ than my country. higher the biggest Fill in the blanks. the longest the oldest much older Review the grammar after class. Practice Presentation thousand million 1.从数字的右端向左数，每三位数加一个逗号。 2.从右向左，第一个逗号处读thousand（千），第二个逗号处读million（百万），第三个逗号处读billion（十亿）。 3.读数时，通常在hundred后加and；若百位数为0，则在thousand后加and。 4.英语中无直接表示“万”和“亿”的单位词，需用thousand和million表达，如“一万”是ten thousand、“一亿”是one hundred million。 较大数字的表达与读法 9，365,278,689 billion 用所给词的适当形式填空。 Exercise 1.(2025·扬州中考) The international influence of Yangzhou is getting ________ than before. (strong) 2.(2025·德阳中考改编) Lin Tao runs ________(fast) than his classmates. He is the running star in his class. 3.(2025·达州中考) The Yangtze River is the ________(long) river in China. 4.(2025·白银中考) The more we communicate with our parents, the _______ (good) we'll understand each other. 5.(2025·成都中考改编) Miss Li always has a lot of work to do. For her, nothing is _______________(important) than a proper plan. 6.(宁波中考改编) For most of the students, June is always the ________(busy) month in a year. 7.Qian Xuesen, father of China's space program, is one of the ________(great) scientists in the world. stronger faster longest better more important busiest greatest 比较级和最高级的构成 语法知识导图 比较级+than the+比较级，the+比较级 比较级的用法 规则变化、不规则变化 形容词和副词的比较级与最高级 比较级+and+比较级 more and more+形容词/副词原级 Summary 语法知识导图 最高级的用法 形容词和副词的比较级与最高级 (the+)最高级+in/of/among短语 one of the+形容词最高级+可数名词复数+in/of 短语 “Which/Who…(+the)+最高级，A, B or C?” Summary Homework 基础作业 拓展作业 实践作业 总结梳理形容词和副词的比较级和最高级的语法知识并绘制思维导图。 制作一张“世界之最”英文小卡片，选一处自然景观，用数据、比较级、最高级等描述其特征。 上网查询更多关于自然奇观的介绍，用数据、比较级、最高级等描述比较2~3处自然景观，并制作成图文并茂的成果。 $