Unit3形容词副词的比较级、as...as表同级比较语法详解+专项练习-2025-2026学年人教版英语八年级上册

该初中英语Unit3语法复习讲义通过表格对比与分类梳理构建了形容词/副词比较级及as...as结构的知识体系，将概念界定、构成规则（分单/双/多音节词及不规则变化）、用法句式（基础对比、修饰词、固定结构）等要点按“概念-构成-用法-考点”逻辑递进，并用表格清晰呈现规则变化示例与不规则变化对照表。 讲义亮点在于“分层进阶”的练习设计，基础题夯实比较级构成与基本用法（如写出“happy”的比较级），提升题通过句型转换（如将“Emma is taller than Ella”改为同义句）培养语言运用与逻辑转换能力，核心考点拆解直指易错点（如重读闭音节双写规则），助力学生精准突破。不同难度练习适配分层需求，教师可据此实施针对性复习，有效提升学生语言能力与学习策略。

Unit3语法详解+专项练习 形容词/副词的比较级、as...as表同级比较 1. 概念界定 · 比较级：用于两者之间的比较，描述一方在性质、程度、数量等方面比另一方“更……”，分为形容词比较级和副词比较级，本单元二者均为核心内容。 · as...as结构：用于两者之间的同级比较，描述双方在某方面“一样……”，否定式not as/so...as表“不如……”。 2. 形容词/副词比较级的构成 比较级构成分规则变化和不规则变化，其中规则变化需根据单词音节、词尾特征判断变形方式。 （1）规则变化 变化类型 变化规则 形容词示例 副词示例 （部分副词由形容词+ly构成） 单音节词 直接加-er tall→taller, short→shorter fast→faster, hard→harder 以e结尾加-r nice→nicer, late→later late→later, fine→finer 重读闭音节（辅+元+辅）双写尾字母加-er big→bigger, slim→slimmer thin→thinner, hot→hotter 辅音+y结尾变y为i加-er happy→happier, easy→easier early→earlier, busy→busier 双音节词 部分双音节词加-er（多为以y/ow/le结尾） pretty→prettier, narrow→narrower slow→slower, simple→simpler 多数双音节词/多音节词前加more careful→more careful, colourful→more colourful carefully→more carefully, quickly→more quickly 副词（特殊） 部分副词本身是比较级形式（如well→better, badly→worse） — well→better, badly→worse （2）不规则变化（需熟记） 原级 比较级 词性 教材例句 good/well better 形/副 Ella dances better than Emma. bad/badly worse 形/副 He sings worse than his sister. many/much more 形/代 There are more activities this year. little less 形/代 He has less time than me. far farther/further 形/副 She lives farther than I do. 3. 比较级的用法 （1）基本句式：A + 谓语 + 比较级 + than + B 表示“A比B更……”，than后可接名词、代词、句子，若前后比较对象一致，可用that/those替代避免重复。 · 形容词比较级：Emma is taller than Ella.（艾玛比艾拉高。） · 副词比较级：Emma sings louder than her.（艾玛唱歌比她大声。） · 替代重复对象：Her hair is shorter than Ella’s (hair).（她的头发比艾拉的短。） （2）比较级的修饰词 可在比较级前加much/a lot/far（……得多）、a little/a bit（一点）、even（甚至）等，加强比较程度。 示例： · This book is much more interesting than that one.（这本书比那本有趣得多。） · He runs a little faster than me.（他跑得比我快一点。） （3）“比较级+and+比较级”结构 表示“越来越……”，单音节词用此结构，多音节词用more and more + 原级。 · 单音节：The weather is getting warmer and warmer.（天气越来越暖和。） · 多音节：She is becoming more and more beautiful.（她变得越来越漂亮。） （4）“the+比较级，the+比较级”结构 表示“越……，越……”。 示例：The harder you work, the better grades you will get.（你学习越努力，成绩就越好。） 4. as...as 表同级比较 （1）肯定式：A + 谓语 + as + 原级 + as + B 表示“A和B一样……”，as之间必须用形容词/副词原级，不可用比较级。 · 形容词：She is as slim as me.（她和我一样苗条。） · 副词：I work as hard as her.（我和她工作一样努力。） （2）否定式：A + 谓语 + not + as/so + 原级 + as + B 表示“A不如B……”，not as...as和not so...as可互换，so更口语化。 示例： · Julie is not as slim as you.（朱莉不如你苗条。） · He doesn’t swim so fast as Sally.（他游泳不如萨莉快。） （3）修饰词 可在as...as前加almost/nearly/quite等，表“几乎/相当和……一样”。 示例：This dress is almost as beautiful as that one.（这条裙子几乎和那条一样漂亮。） 5. 核心考点拆解 （1）比较级构成的易错点 · 重读闭音节双写尾字母：需满足“辅+元+辅”且重读，如big→bigger，但play→player（非重读闭音节，不双写）； · 辅音+y结尾变形：happy→happier，但boy→boyer（错误，元音+y结尾直接加er）； · 多音节词比较级：必须加more，不可加-er，如colourful→more colourful（而非colourfuler）。 （2）than后的代词形式 than后接人称代词时，可用主格或宾格，口语中宾格更常用；若后接从句，用主格。 · 口语：He is taller than me. · 正式/从句：He is taller than I (am). （3）as...as的核心禁忌 as之间必须用原级，不可用比较级/最高级，如as taller as（错误）→as tall as（正确）。 （4）形容词与副词比较级的区分 · 形容词比较级修饰名词或作表语：She is happier than before.（表语）/ a bigger house（定语）； · 副词比较级修饰动词/形容词/其他副词：She sings more loudly than him.（修饰动词sing）。 专项练习题 （1）基础题：写出下列单词的比较级 1. tall → 2. fast → 3. nice → 4. big → 5. happy → 6. easy → 7. careful → 8. quickly → 9. good/well → 10. bad/badly → 11. much/many → 12. thin → 13. late → 14. beautiful → 15. far → （2）基础题：用所给词的适当形式填空 1. Emma is ________ (tall) than Ella, but Ella is ________ (smart) than Emma. 2. This year there are ________ (many) activities than last year. 3. She dances ________ (well) than her sister, but she sings ________ (badly) than her. 4. I get up ________ (early) than my mother every day. 5. Is Julie ________ (slim) than you? No, she is as ________ (slim) as me. 6. The weather in Guangzhou is ________ (warm) than that in Vancouver in January. 7. He runs ________ (fast) than Tom, but Jack swims as ________ (fast) as Sally. 8. This book is ________ (interesting) than that one, and it’s ________ (expensive) too. 9. She is becoming ________ (beautiful) and ________ (beautiful). 10. ________ (hard) you study, ________ (good) your English will be. （3）基础题：用as...as或比较级完成句子 1. 汤姆和山姆一样聪明。 Tom is as ________ as Sam. 2. 广州的人口比温哥华多。 The population of Guangzhou is ________ than that of Vancouver. 3. 她不如她哥哥认真。 She isn’t as ________ as her brother. 4. 杰克游泳不如萨莉快。 Jack doesn’t swim as ________ as Sally. 5. 今年的活动比去年更丰富多彩。 This year’s activities are ________ ________ than last year’s. 6. 艾玛起床比我早。 Emma gets up ________ than me. 7. 七月的温哥华比广州凉爽。 Vancouver is ________ than Guangzhou in July. 8. 他工作和我一样努力。 He works as ________ as me. （4）提升题：选择最佳选项补全句子/对话 1. Ella dances ________ than Emma, but Emma sings ________ than her. A. good; loud B. better; louder C. well; loudly 2. — Is Julie slimmer than you? — No, she isn’t. She is as slim ________ me. A. as B. than C. like 3. The population of Vancouver is ________ than that of Guangzhou. A. small B. smaller C. smallest 4. This movie is ________ more interesting than that one. A. much B. many C. lot 5. ________ you practice, ________ you will play the piano. A. The more; the better B. More; better C. The most; the best 6. He doesn’t run ________ fast ________ his friend. A. so; as B. as; than C. more; than 7. She is becoming ________ and more beautiful. A. happy B. happier C. more happy 8. My sister is ________ careful than me, so she makes fewer mistakes. A. more B. much C. very 9. — Who is ________, Tom or Sam? — I think Tom is as smart as Sam. A. smart B. smarter C. smartest 10. It rains ________ in Guangzhou than in Vancouver every year. A. much B. more C. most （5）提升题：句型转换（8题） 1. Emma is taller than Ella.（改为同义句） → Ella is ________ than Emma. 2. She sings loudly. He sings more loudly.（合并为一句） → He sings ________ ________ than her. 3. Julie is as slim as me.（改为否定句） → Julie is ________ ________ ________ as me. 4. This book is interesting. That book is more interesting.（合并为一句） → That book is ________ ________ than this one. 5. He works hard. I work hard too.（用as...as改写） → He works ________ ________ ________ me. 6. The box is big. The bag is bigger.（用than改写） → The bag is ________ ________ the box. 7. She is 16 years old. I am 14 years old.（用older than改写） → She is ________ ________ me. 8. He runs fast. She runs faster.（用not as...as改写） → He ________ ________ ________ ________ as her. 三、参考答案 （1）基础题：写出下列单词的比较级 1. taller 2. faster 3. nicer 4. bigger 5. happier 6. easier 7. more careful 8. more quickly 9. better 10. worse 11. more 12. thinner 13. later 14. more beautiful 15. farther/further （2）基础题：用所给词的适当形式填空 1. taller; smarter 2. more 3. better; worse 4. earlier 5. slimmer; slim 6. warmer 7. faster; fast 8. more interesting; more expensive 9. more; more beautiful 10. The harder; the better （3）基础题：用as...as或比较级完成句子 1. smart 2. larger 3. serious 4. fast 5. more colourful 6. earlier 7. cooler 8. hard （4）提升题：选择最佳选项补全句子/对话 1. B 2. A 3. B 4. A 5. A 6. A 7. B 8. A 9. B 10. B （5）提升题：句型转换 1. shorter 2. more loudly 3. not as/so slim 4. more interesting 5. as hard as 6. bigger than 7. two years older than 8. doesn’t run as/so fast ( 1 ) 学科网（北京）股份有限公司 $