Unit 4 The Wonders of Nature SectionA Grammar focus 课件- 2025-2026学年人教版八年级英语下册

The Wonders of Nature Unit 4 Section A What is amazing about nature? Section A Grammar focus 01 02 03 04 能够总结和梳理大数字的表达法，并理解英文数字表达法的特点。 能够掌提有关地理之最及其高度、长度、深度、面积等信息的问句和答语，使用形容词和副词的比较级、最高级和大数宇描述自然景观。 能自主整合课内外地理信息，运用比较级/最高级和单位表达，完成对自然奇观的综合介绍与多维度对比，实现从课本句型到真实交际的知识迁移与创造性输出。 复习并现固形容词和副词的比较级和最高级的用法，总结和积累用于比较事物的不同语言结构； Learning objectives 、 Let’s enjoy some natural wonders of the world. Warming-up 、 Read the sentences. Decide if each infinitive in bold functions as an objective complement or adverbial. 4a 最高级 最高级 原级 最高级 比较级 最高级 、 形容词和副词有三个比较等级，即： 1. 原级（Positive form），也就是原形。 2. 比较级（Comparative form），表示“较……”或“更……”的意思。（用于两者之间比较）一般是在原级后面加er，等同于中文的“更…”。 3. 最高级（Superlative form），表示“最……”的意思。 （用于三者或三者以上的比较）一般是在原级后面加est，等同于中文的“最…”。 形容词副词的原级\比较级\最高级 、 ①直接加 -er 或 -est tall—_____—______ long—______—______ ②以不发音的字母e结尾的单词直接加 -r 或 -st ③以“辅音字母+y” 结尾，把y变为i，再加 -er 或- est nice—______—______ heavy—________—________ taller tallest longer longest nicer nicest heavier heaviest 规则变化 形容词副词比较等级的构成 、 ④重读闭音节（末尾只有一个辅音字母） 双写辅音字母再加 -er或 -est ⑤部分双音节词和多音节词 分别在原级前加more构成比较级和most构成最高级 big—_______—_______ slowly—___________—___________ beautiful—______________—______________ bigger biggest more slowly most slowly more beautiful most beautiful 形容词副词比较等级的构成 规则变化 、 原级 比较级 最高级 good / well better best bad worse worst many/much more most little less least old older/elder oldest / eldest far farther (更远)/ further (进一步的) farthest / furthest 不规则变化 、 1. 同级比较 基本结构as ... as ... 意为“和……一样”。 ① Peter is as tall as Tom. 一、形容词和副词的原级 彼得和汤姆一样高。 他和他姐姐/妹妹一样努力工作。 ② He works as hard as his sister. 具体用法 、 比较级用于两者（人或物）之间，表示“其中一个比另 一个更……”或“较……”，基本结构：比较级＋ than。 ① China is much older than the United States. 中国比美国古老得多。 我们必须比从前更谨慎地工作。 ② We must work much more carefully than we did before. 强调比较级的比较程度或语气时，形容词比较级前面可以由much, even, far, a little, a bit, a lot等来修饰。 二、形容词和副词的比较级 、 * “比较级 + than any other + 单数可数名词 + 其他” 表示“比其 他任何一个……都……”。该结构可与“the+最高级”相互转换。 Qomolangma is higher than any other mountain in the world. = Qomolangma is the highest mountain in the world. 珠穆朗玛峰比世界上其他任何山峰都高。( = 珠穆朗玛峰是世界上最高的山峰。) * “比较级 + and + 比较级” 表示“越来越……”。 ① The earth is getting warmer and warmer. 地球变得越来越暖和。 ② Wind blows up bags higher and higher in the sky. 风把袋子吹得越来越高。 * “the + 比较级 + …, the + 比较级 + …” 表示“越……， 越……”。 ① The busier he is, the happier he feels. 他越忙越高兴。 ② The faster you run, the harder you breathe. 你跑得越快，呼吸就越困难。 * “数词 + times + 比较级 + than” 表示“……是……的几倍”。 The elephant weighs ten times more than the panda. 大象的体重是熊猫的十倍。 、 最高级用于三者或三者以上（人或物）的比较，表示“最……”,基本结构: the + 最高级 (+ of / in) ... 。 ① Qomolangma is the highest mountain in the world. ② The Sahara is the biggest desert in the world. 三、形容词和副词的最高级 ③ The Caspian Sea is the deepest of all the salt lakes. ④ The Nile is the longest river in the world. ⑤ China is the biggest country in Asia. ⑥ The Yangtze River is the longest river in Asia. ⑦ She plays volleyball (the) best in her class. 、 * “the + 序数词 + 最高级 + 单数可数名词 + in …” 表示“是…… 中的第几……”。 The Amazon is the second longest river in the world. 亚马逊河是世界上第二长的河流。 * “one of the + 形容词最高级 + 复数名词” 表示“最……之一”。 She is one of the best tennis players in the world. 她是世界上最好的网球运动员之一。 、 单项选择。 1. The National library of China is _____ public library in Asia. [2025年 北京市] A. large B. larger C. largest D. the largest 2. Lingling is one of _____ students in my class. She is always ready to help. [2025年 天津市] A. helpful B. more helpful C. less helpful D. the most helpful 3. AI technology in China has developed ______ than anyone expected. [2025年 福建省] A. fast B. faster C. fastest 直击中考 、 4. Mount Gongga is the ____ mountain in Sichuan, higher than any other in this area. [2025年 成都市] A. high B. higher C. highest 根据句意，用括号内所给单词的适当形式填空。 1. From the 1400s to the 1800s, winters in the northern half of the earth were ______ (cold) and longer than they are now. [2025年 天津市] 2. She helps them to make _______ (much) money than before. [2024年 新疆] colder more 、 Read the sentences again. Pay attention to the numbers. 4a 读作：nine million 读作：eleven thousand 读作：six thousand and three hundred 、 在英语中，对于万以上的数字，我们该如何表达呢？这就要记住英语数字读法特点。以下面一个数字为例： 注意每三个数为一个单位，按照百、十、个向下读。 6 , 500 , 431 , 729 billion million thousand seven hundred and twenty-nine six billion, five hundred million, four hundred and thirty-one thousand, 大数字的表达方法 18 、 1,411,708,724.508 billion 十亿 million 百万 thousand 千 point 点 five zero eight 1 从小数点开始从右到左，每个数加一个“,”; 2 小数点读“point” ； 3 从左到右读数，每隔三位按百位数读； 4 百位和十位之间加and，若十位为0，and不省略 5 小数点后面的数只读数字，不读数位。 and and and hundred hundred hundred 较大数字的表达与读法 第一个逗号前的数为thousand（千），第二个逗号前的数为million（百万），第三个逗号前的数为billion（十亿）。 、 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 乞力马扎罗山 25,768 /ˈkjuːbɪk/ adj. 立方的 /maɪl/ n. 英里 因加瀑布 东非大裂谷 塔克拉玛干沙漠 three hundred and thirty-seven thousand four thousand Write or spell out the numbers. 4b 倾泻而下 每秒 ……总面积为…… 、 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 __________ 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 __________ but also the __________ experience of our trip! large scary amazing far close loud closer most amazing louder louder far scariest most amazing Complete the passage with the correct forms of the words in the box. 4c go close to 靠近；接近 as far as......远至（某处） right before our eyes就在眼前 as far as the eye can see 极目所尽 、 •What is the highest ...? •Which park is bigger, ... or ...? •Is ... longer than ...? You can ask for help: Write some questions to compare places. Then ask a partner your questions. 4d Homework 1. 基础作业：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。 2. 拓展作业：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。 3.实践作业：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。 $