Unit 2 Wonders of nature 语法专项 形容词,副词比较级和最高级 课件(共29张PPT) 2025-2026学年沪外教版七年级英语下册

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Unit 2 Wonders of nature 语法专项 形容词,副词比较级和最高级 课件(共29张PPT) 2025-2026学年沪外教版七年级英语下册

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(共29张PPT)
教学课件
沪外教英语七年级下册
Unit2 语法专项—— 形容词/副词比较级和最高级
全解精讲+分层练习
学习目标
1. 掌握形容词、副词比较级和最高级的核心定义
2. 牢记规则变化和不规则变化的所有形式
3. 熟练运用两种等级的基本结构和特殊结构
4. 能准确完成各类习题,规避常见易错点
语法引入· 比较级和最高级
1. 本单元语法用于描述事物之间的程度差异
2. 贴合“自然奇观”话题,比如描述山脉、沙漠、河流
3. 核心分类:比较级(两者比较)、最高级(三者及以上)
4. 简单区分:比较级说“更……”,最高级说“最……”
5. 举例:The Sahara is large(原级)→ larger(比较级)→ largest(最高级)
核心定义详解
1. 比较级(Comparatives)
用于两者之间的比较,表达“更……”的含义
常用搭配:than(比),连接被比较的两个对象
2. 最高级(Superlatives)
用于三者及以上的比较,表达“最……”的含义
关键注意:形容词最高级前必须加the,副词可省略
规则变化·单音节词(一)
1. 一般情况:直接加 -er(比较级)、-est(最高级)
例:cool → cooler(更凉爽的)→ coolest(最凉爽的)
例:high → higher(更高的)→ highest(最高的)
2. 以e结尾:直接加 -r(比较级)、-st(最高级)
例:large → larger(更大的)→ largest(最大的)
例:nice → nicer(更好的)→ nicest(最好的)
规则变化·单音节词(二)
1. 辅音+y结尾:先变y为i,再加 -er、-est
例:dry → drier(更干燥的)→ driest(最干燥的)
例:busy → busier(更忙的)→ busiest(最忙的)
2. 重读闭音节(元音+辅音结尾):双写末尾辅音,再加 -er、-est
例:big → bigger(更大的)→ biggest(最大的)
例:hot → hotter(更热的)→ hottest(最热的)
规则变化·多音节词及副词
1. 多音节词(2个及以上音节,如beautiful)
比较级:在词前加 more(更……)
最高级:在词前加 most(最……)
例:beautiful → more beautiful → most beautiful
2. 以-ly结尾的副词:同样加 more、most
例:easily → more easily → most easily
例:slowly → more slowly → most slowly
规则变化汇总表
单词类型 变化规则 比较级示例 最高级示例
单音节词(一般) 加 -er/-est cool → cooler cool → coolest
单音节词(以e结尾) 加 -r/-st large → larger large → largest
单音节词(辅音+y) 变y为i加 -er/-est dry → drier dry → driest
多音节词/ly副词 加 more/most amazing → more amazing amazing → most amazing
不规则变化(必背)
原级 比较级 最高级 简单用法
good/well better best 表示“更好”“最好”
bad/ill worse worst 表示“更差”“最差”
many/much more most 表示“更多”“最多”
不规则变化拓展
1. little → less(更少的)→ least(最少的)
例:There is less water in the desert than in the river.(沙漠里的水比河里少。)
2. far → farther/further → farthest/furthest
farther:侧重“距离更远”(如山脉距离)
further:侧重“程度更深”(如了解更多)
用法1·两者比较(比较级核心结构)
核心结构:A + be动词/实义动词 + 比较级 + than + B
A和B是被比较的两个对象,必须性质一致
例句1(形容词):The Li River is clearer than the Yellow River.(漓江比黄河更清澈。)
例句2(副词):He runs faster than his brother.(他比他弟弟跑得更快。)
4. 注意:than后可接代词(如me, him)或名词短语
用法1·比较级拓展技巧
1. 比较级前可加程度副词:much, even, a little
例:The Grand Canyon is much more amazing than I thought.(科罗拉多大峡谷比我想的更令人惊叹。)
2. 避免重复:than后可省略与前面相同的成分
例:This river is longer than that one.(省略longer)
3. 易错点:than不能遗漏,比较对象不能混淆
用法2·三者及以上比较(最高级核心结构)
核心结构:A + be动词/实义动词 + the + 最高级 + 比较范围(in/of...)
1. 比较范围:用in(在……里面)或of(在……之中)引出
例句1(形容词):The Pacific Ocean is the largest ocean in the world.(太平洋是世界上最大的海洋。)
例句2(副词):She sings the most beautifully in our class.
注意:副词最高级前的the可省略,形容词不能省
用法2·最高级拓展结构
高频拓展:one of the + 最高级 + 复数名词(最……之一)
结构解析:one of 表示“其中之一”,后面接复数名词
2例句1:Zhangye Geopark is one of the most beautiful geoparks in China.(张掖地质公园是中国最美的地质公园之一。)
例句2:Mount Huang is one of the highest mountains in Asia.
易错点:最高级后必须接复数名词
用法3·特殊结构(一)
结构1:比较级 + and + 比较级 → 表示“越来越……”
用法:描述事物逐渐变化的过程
示例:The wind is getting colder and colder.(风变得越来越冷。)
示例:The scenery becomes more and more beautiful.(风景变得越来越美。)
注意:多音节词需重复more,不能直接加and
用法3·特殊结构(二)
结构2:The + 比较级, the + 比较级 → 表示“越……,越……”
用法:前后两个分句相互关联,程度同步变化
例句1:The higher you climb, the more wonderful the view is.(你爬得越高,看到的风景越美。)
例句2:The more you practice, the better you will do.
易错点:两个the都不能省略,后面均接比较级
易错点汇总(一)
1. 重复修饰错误:比较级前不能加more(单音节词)
错:more higher 对:higher
2. 最高级漏the:形容词最高级前必须加the
错:largest desert 对:the largest desert
3. 不规则变化混淆:good的比较级不是more good,是better
4. 比较对象不一致:不能拿“山脉”和“河流的长度”比较
易错点汇总(二)
1. 辅音+y结尾变化错误:直接加er/est,未变y为i
错:busy → busyer 对:busy → busier
2. 重读闭音节未双写:元音+辅音结尾,未双写末尾辅音
错:big → biger 对:big → bigger
3. 比较范围错误:最高级用than,比较级用in/of
错:the best than others 对:the best of all
习题一· 根据提示,写出下列单词的比较级和最高级
1. warm → ____________ → ____________
2. nice → ____________ → ____________
3. happy → ____________ → ____________
4. thin → ____________ → ____________
5. wonderful → ________________ → _________________
6. well → ____________ → ____________
7. much → ____________ → ____________
warmer
warmest
nicer
nicest
happier
happiest
thinner
thinnest
more wonderful
most wonderful
better
best
more
most
习题二· 用所给词的适当形式填空(比较级/最高级)
1. The Sahara Desert is ____________ (dry) than any other desert in the world.
2. This is ________________ (beautiful) natural wonder I have ever visited.
3. Mount Everest is ____________ (high) mountain on Earth.
4. The Li River is ____________ (clear) than the Yangtze River.
5. She sings ____________ (well) than her sister.
6. This park is ____________ (easy) to reach than that one.
drier
the most beautiful
the highest
clearer
better
easier
习题三·用所给词的适当形式填空,结合程度副词和特殊结构
1. The Grand Canyon is ____________ (much/amazing) than I expected.
2. The weather becomes ____________ (cold) and ____________ (cold) in winter.
3. ____________ (many) you learn about nature, ____________ you will feel love for it.
4. This is one of ____________ (most/wonderful) views in Zhangye Geopark.
5. He runs ____________ (even/fast) than his best friend.
The more
the more
the most wonderful
even faster
much more amazing
colder
colder
习题四·找出错误并改正,说明错误原因(简要)
1. The Yellow River is the second longer river in China.
2. This lake is more deeper than the one near our school.
3. She is the most better student in our class.
4. The more we practice, the most confident we will be.
5. The Sahara is largest desert in the world.
longer → longest(解析:“第几最……”用最高级)
去掉more(解析:deeper是单音节比较级,无需more修饰)
most better → best(解析:good的最高级是best,不能用most修饰)
most → more(解析:“The+比较级,the+比较级”结构)
largest前加the(解析:形容词最高级前必须加the)
习题五·根据中文意思,用比较级或最高级完成句子
1. 大堡礁比世界上任何其他珊瑚礁都大。
The Great Barrier Reef is ____________ than any other coral reef in the world.
2. 这是我见过的最令人惊叹的自然奇观。
This is ________________ natural wonder I have ever seen.
3. 他游泳比他哥哥好。
He swims ____________ than his brother.
bigger
the most amazing
better
题六·完成句子
1. 雨后,岩石的颜色变得越来越鲜艳。
After the rain, the colours of the rocks become ____________ and __________________.
2. 你了解的自然奇观越多,就越热爱我们的地球。
____________ you know about natural wonders, ____________ you will love our earth.
3. 张掖地质公园是中国最著名的地质公园之一。
Zhangye Geopark is one of ____________________ geoparks in China.
more colourful
the most famous
The more
the more
more
习题七·单项选择
从A、B、C、D中选择最佳答案,侧重用法辨析
1. —Which is ____________, the Li River or the Pearl River —The Li River.
A. clear B. clearer C. clearest D. more clear
2. This is ____________ interesting book I have ever read.
A. the most B. more C. most D. the more
3. —How is the weather today —It’s ____________ than yesterday.
A. warm B. warmer C. warmest D. more warm
B
A
B
4. The ____________ you climb, the more beautiful the view is.
A. high B. higher C. highest D. more high
5. She sings ____________ in our class. Everyone likes her voice.
A. the most beautifully B. more beautifully C. most beautiful D. the more beautiful
6. There is ____________ water in the lake than in the river.
A. little B. less C. least D. more little
7. He is one of ____________ students in our grade.
A. good B. better C. best D. the best
B
A
B
D
习题八·根据要求,将下列句子改为比较级或最高级形式
1. The river is long.(改为比较级 )
The river is ____________ than that one.
2. This mountain is high.(改为最高级 )
This mountain is ________________________ in the world.
3. She dances well.(改为比较级 )
She dances ____________ than her sister.
4. This park is beautiful.(改为最高级 )
This park is _______________________ in the city.
longer
the highest mountain
better
the most beautiful park
课堂总结(一)·核心知识点
1. 定义:比较级(两者,更……+than),最高级(三者及以上,最……+the+范围)
2. 变化:规则变化(按词形分类)、不规则变化(5组必背)
3. 核心结构:两者比较、三者比较、两个特殊结构
4. 关键注意:形容词最高级加the,副词可省略;比较对象要一致
教学课件
Unit2 语法专项—— 形容词/副词比较级和最高级
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