Unit 4 The Wonders of Nature Section A Grammar (4a-4d)课件 2025-2026学年人教版英语八年级下册

Unit 4 The Wonders of Nature Section A (Grammar Focus-4d) 1. 复习并巩固形容词和副词的比较级、最高级用法，总结并积累用于描述自然景观和比较事物的不同； 2. 总结和梳理大数字的表达法，理解英文数字表达法的特点，并用来询问和描述地理之最（高度、长度、深度、面积等）信息，对大自然的神奇产生热爱与敬畏。 Learning objectives Engagement 1. Mount Kilimanjaro 乞力马扎罗山 2. Inger Falls 英加瀑布 3. Victory Falls 维多利亚瀑布 4. the East African Rift Valley 东非大裂谷 5. the Tacama Desert 塔克拉玛干沙漠 6. pour down 倾盆而下；倾泻而下 7. a magical experience 一次奇妙的体验 8. a total area of 总面积达…… 9. go on for 延续长达…… 10. at the top/bottom of 在……的顶部/底部 11. rush past 飞速掠过 12. far 远→比较级和最高级 →farther 更远→ farthest 最远 Preview new words and phrases 1. 复习巩固形容词和副词比较级和最高级的变化规则，完成表格 Exploration 类型 构成规则 原级(Positive) 比较级(Comparative) 最高级(Superlative) 一般情况(加)   tall     以不发音的e结尾(去)   nice     重读闭音节末尾只有一个辅音字母(双)   big     以辅音字母+y结尾(变)   busy     多音节和部分双音节（前置）   beautiful     不规则 / good/well     bad/badly     far     old     many/much     little   加-er或-est 加-r或-st 把y变为i再加-er或-est 双写这个辅音字母后再加-er或-est 在单词前加 more 构成比较级，加 most 构成最高级 taller tallest nicer nicest bigger biggest busier busiest more~ most ~ better more worse less older/elder farther/further best most worst least oldest/eldest farthest/furthest 速读4a 和以下短文，对子互译，勾画出含有形容词和副词比较级和最高级的句式, 合作并展示There are two amazing places on earth. The first place is much drier than most other places. It is one of the hottest places during the daytime. The days there are usually sunnier than in most places, but the nights can be colder than you think. Plants are not as common as in other places because water is one of the most difficult things to find here. It is also bigger than any other desert in the world. The second place is greener than almost anywhere else. The rain falls the heaviest in this place. The trees grow taller and thicker than the ones in cities. The air there is much fresher than in other places. It is bigger than any other rainforest in the world. 常见的比较级句式： Task 1: 探究形容词、副词常见句式结构 Exploration 速读4a 和以下短文，对子互译，勾画出含有形容词和副词比较级和最高级的句式, 合作并展示There are two amazing places on earth. The first place is much drier than most other places. It is one of the hottest places during the daytime. The days there are usually sunnier than in most places, but the nights can be colder than you think. Plants are not as common as in other places because water is one of the most difficult things to find here. It is also bigger than any other desert in the world. The second place is greener than almost anywhere else. The rain falls the heaviest in this place. The trees grow taller and thicker than the ones in cities. The air there is much fresher than in other places. It is bigger than any other rainforest in the world. Explanation 常见的最高级句式： Task : 探究形容词、副词常见句式结构 形容词和副词的比较等级 （1）原级的用法和句式 This river is as long as that river. The mountain looks as high as the sky. Pine tress(松树) are not as/so tall as redwood tress. Explanation 两者的同级比较用“as+形容词或副词的_______+as”，其否定形式为“not +形容词或副词的_____+as”。 原级 原级 as/so 7 形容词和副词的比较等级 （2）比较级的句式和用法 ①“A+谓语动词+_______+________+B”两者之间的比较，表示一个比另一个更…… Redwood tress are taller than Pine tress(松树) . ②“_______+and+ ________”表示事物本身程度的逐渐变化，意为“______________”。 The noise of the water is louder and louder. Mount Huangshan is becoming more and more beautiful. Explanation 比较级 比较级 比较级 than 越来越…… 8 形容词和副词的比较等级 （2）比较级的句式和用法 ③“the+比较级 ..., ____________ ...”表示一方的程度随着另一方的变化而 变化，意为“越……，____________”。 The higher we climb, the more beautiful the scenery we see. The closer we get to the waterfall, the louder the sound becomes. ④“Which/Who+系动词+________, A______ B?”表示两个人或事物中哪一个/谁更…… e.g. Which is longer, the Nile or the Yangtze? Explanation the+比较级 （就）越…… 比较级 or 形容词和副词的比较等级 （2）比较级的句式和用法拓展： ⑤“比较级+than any other+单数名词”表示“比其他任何一个……都……”，用于同一范围的比较。 e.g. The Yangtze River is longer than any other river in China. 长江比中国其他任何一条河流都长。 ⑥“比较级+than the other+复数名词”表示“比其他……都……”，用于同一范围的比较。 e.g. The Yangtze River is longer than the other rivers in China. 长江比中国其他河流都长。 Explanation 形容词和副词的比较等级 （2）比较级的句式和用法 重点 修饰形容词或副词的比较级可以用 much、a lot、a little、far、even 等，但不能用 very。 e.g. This story is much more interesting than that one. 这个故事比那个有趣得多。 Explanation 形容词和副词的比较等级 （3）最高级的句式和用法 ①“the+_______+________ ...”，其中，in 后常跟表示组织、团体之类表示范围的名词；of 后的名词或代词与句子的主语属于同一个比较对象 e.g. Nile River is the longest in the world. Nile River is the longest of all the rivers. ②“Which/Who+系动词+the+最高级, A, B or C?”表示三个人或事物中哪一个/谁最…… e.g. Which is the biggest, the sun, the moon or the earth? Explanation 最高级 in/of 形容词和副词的比较等级 （3）最高级的句式和用法 ③“one of the+_________+__________”表示“最……的……之一”。 e.g. Victoria Falls is one of the most beautiful waterfalls in the world. ④“the +________+__________+___________”表示“第……（最长，宽，高......）” e.g. Nile River is the first longest river in the world. The Yangtze River is the third longest in the world. Explanation 最高级 + 复数名词 序数词 + 最高级 + 单数名词 Explanation Task2 : 回顾与探究数字的读法 阿拉伯数字 英文表达 (English Reading) 156 one hundred and fifty-six 2,048 two thousand and forty-eight 12,345 twelve thousand three hundred and forty-five 100,000 one hundred thousand 1,000,000 one million 1,500,000 one million five hundred thousand 1,000,000,000 one billion 0.5 zero point five 3.14159 three point one four one five nine 1. 百亿级大数：中文习惯“万、亿”进制，英语则是“_______________”进制（1,000 thousand = 1 million; 1,000 million = 1 billion）。 2. 标点规则：在读四位数及以上的整数时，记得每______位添加一个________（千分位），帮助正确识别单位。 3. 在英式英语中，百位和十位/个位之间通常加_______ 4. 小数点后：数字______________，例如 10.05 必须读 ten point zero five。 千、百万、十亿 逗号 逐个单独读 三 and Practice： How to read the following numbers 5,895 ________________________________________ 370,700______________________________________ 8848.68______________________________________ eight thousand eight hundred and forty-eight point six eight five thousand, eight hundred and ninety-five three hundred and seventy thousand, seven hundred 4b Write or spell out the numbers. 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 25,7683 four thousand three hundred and thirty-seven thousand Evaluation 4c Complete the passage with the correct forms of the words in the box. One word is used more than once. 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 closer large amazing far close loud louder far most amazing Evaluation Summary $