Unit4语法讲解及习题：形容词_副词比较级与最高级（复习）+ 大数表达- 2025-2026学年人教版八年级英语下册

人教英语八下Unit4语法讲解及习题 形容词/副词比较级与最高级（复习）+ 大数表达 一、语法概念与用法详解 1. 形容词/副词比较级与最高级 比较级和最高级用于描述人或事物在程度上的差异，本单元结合自然奇观主题，重点复习其规则变化与不规则变化。 核心用法 形式 含义 常用句式 原级 描述人/事物本身的特征 as + 原级 + as（和……一样） not as/so + 原级 + as（不如……） 比较级 两者之间的比较 A + be/动词 + 比较级 + than + B the + 比较级 + of the two（两者中更……的一个） 最高级 三者及以上的比较 the + 最高级 + 范围（in/of短语） one of the + 最高级 + 复数名词（最……之一） 变化规则 类型 规则 例词 单音节词 一般直接加 -er / -est high → higher → highest deep → deeper → deepest 以 -e 结尾 直接加 -r / -st large → larger → largest 以重读闭音节结尾（辅+元+辅） 双写尾字母加 -er / -est big → bigger → biggest hot → hotter → hottest 以辅音字母 + y 结尾 变 y 为 i 加 -er / -est easy → easier → easiest happy → happier → happiest 多音节词 前面加 more / most amazing → more amazing → most amazing carefully → more carefully → most carefully 不规则变化 无固定规则，需记忆 far → farther/further → farthest/furthest good/well → better → best bad/badly → worse → worst 例句 原级：Some blind animals can “see” as well as others.（一些盲动物的“视力”和其他动物一样好。） 比较级：Mount Qomolangma is still growing taller.（珠穆朗玛峰仍在变高。） 最高级：It is the biggest desert in the world.（它是世界上最大的沙漠。） 2. 大数表达 本单元涉及自然奇观的面积、长度等数据，需掌握英语中万、百万、十亿等大数的读写。 核心规则 三位数及以内：百位与十位间用 and 连接（英式），美式可省略。 5,895 → five thousand, eight hundred and ninety-five 四位数及以上：从右向左每三位为一组，依次为 thousand（千）、million（百万）、billion（十亿）。 9,000,000 → nine million 11,000 → eleven thousand 6,300 → six thousand, three hundred 读法注意：每组数字按三位数读法，后接单位；单位 thousand/million/billion 不用复数。 二、练习题 基础巩固 写出下列单词的比较级与最高级 1. high → ____________ → ____________ 2. deep → ____________ → ____________ 3. far → ____________ → ____________ 4. amazing → ____________ → ____________ 5. loud → ____________ → ____________ 用英文写出下列数字 6. 5,895 → ________________________________________________ 7. 25,768 → ________________________________________________ 8. 4,000 → ________________________________________________ 9. 337,000 → ________________________________________________ 10. 9,000,000 → ________________________________________________ 能力提升 单项选择 11. The Sahara Desert is ____________ desert in the world. A. big B. bigger C. biggest D. the biggest 12. The Mariana Trench is ____________ than any other trench in the ocean. A. deep B. deeper C. deepest D. the deepest 13. Some animals can see ____________ as humans. A. as well B. as good C. so well D. so good 14. The Yangtze River is ____________ river in China. A. long B. longer C. longest D. the longest 15. This waterfall is ____________ than that one. A. amazing B. more amazing C. most amazing D. the most amazing 16. He ran ____________ of all the runners. A. far B. farther C. farthest D. the farthest 17. The lake is 1,000 metres ____________ than the other one. A. deep B. deeper C. deepest D. the deepest 18. It is one of ____________ waterfalls in the world. A. famous B. more famous C. most famous D. the most famous 19. The noise of the waterfall is getting ____________. A. loud B. louder C. loudest D. the loudest 20. This canyon is 4,000 miles ____________. A. long B. longer C. longest D. the longest 21. The mountain is 5,895 metres ____________. A. high B. higher C. highest D. the highest 22. The desert is about 9,000,000 square kilometres ____________. A. large B. larger C. largest D. the largest 拓展挑战 句型转换 23. The Sahara Desert is big.（改为最高级） The Sahara Desert is ____________ ____________ ____________ in the world. 24. The Mariana Trench is deep.（改为比较级，与其他海沟对比） The Mariana Trench is ____________ ____________ any other trench in the ocean. 25. This waterfall is amazing.（改为最高级，用“one of”结构） This is one of ____________ ____________ ____________ in the world. 26. The Yangtze River is long.（改为最高级，范围“in China”） The Yangtze River is ____________ ____________ ____________ in China. 27. Some animals can see well.（改为原级比较，与人类对比） Some animals can see ____________ ____________ ____________ humans. 五、语篇填空（28-35题） My friends and I visited Victoria Falls in Africa last year. Visiting one of the world’s 28. ____________ (large) waterfalls was a magical experience. As we went 29. ____________ (close) to the falls, the noise of the water slowly grew 30. ____________ (loud) and 31. ____________ (loud). Then, right before our eyes, the waterfall appeared. It went on for as 32. ____________ (far) 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 33. ____________ (amazing) but also the 34. ____________ (scary) experience of our trip! The falls are about 1,708 metres 35. ____________ (wide) and 108 metres 36. ____________ (high). 三、答案与解析 基础巩固 1. higher; highest 2. deeper; deepest 3. farther/further; farthest/furthest 4. more amazing; most amazing 5. louder; loudest 6. five thousand, eight hundred and ninety-five 7. twenty-five thousand, seven hundred and sixty-eight 8. four thousand 9. three hundred and thirty-seven thousand 10. nine million 能力提升 11. D（世界范围内的最高级，用 the biggest） 12. B（与其他海沟对比，用比较级 deeper） 13. A（原级比较 as well as，修饰动词 see 用副词 well） 14. D（中国范围内的最高级，用 the longest） 15. B（两者对比，多音节词比较级用 more amazing） 16. D（所有跑步者中最远，用最高级 the farthest） 17. B（两者深度对比，用比较级 deeper） 18. D（one of the + 最高级 + 复数名词 结构） 19. B（get louder 表示“变得更响”，用比较级） 20. A（描述长度用原级 long） 21. A（描述高度用原级 high） 22. A（描述面积用原级 large） 拓展挑战 句型转换 23. the biggest desert 24. deeper than 25. the most amazing waterfalls 26. the longest river 27. as well as 语篇填空 28. largest（“世界上最大的瀑布之一”，用最高级） 29. closer（“走近瀑布”，用比较级表动作趋势） 30. louder 31. louder（“越来越响”，用 comparative + and + comparative 结构） 32. far（“as far as” 固定搭配，表“远至”） 33. most amazing 34. scariest（“最令人惊叹但也最吓人的经历”，用最高级） 35. wide; 36. high（描述宽度和高度用原级） ( 1 ) 学科网（北京）股份有限公司 $