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

该初中英语课件围绕“形容词和副词比较级、最高级的构成及用法”展开，结合大数字读写，通过4a圈画比较级/最高级形容词和副词的练习导入，以撒哈拉沙漠、马里亚纳海沟等自然奇观实例衔接规则变化（如双写辅音、y变i）与用法（原级as...as、比较级than），后续4b数字拼写、4c短文填空等练习搭建学习支架，帮助学生逐步掌握知识点。 其亮点在于以“自然奇观”主题串联语法，如4c用Victoria Falls短文让学生在真实语境中运用比较级，培养语言能力；通过4d提问比较地点、作业用河流长度表格造句，引导学生分析比较，提升思维品质。多样练习设计（填空、提问、造句）助力学生主动运用学习策略，教师可借助情境化教学高效落实语法目标，学生在探究自然中扎实掌握语法，提升综合语言运用能力。

Unit 4 The Wonders of Nature Section A Grammar Focus Grammar Focus 4a Read the sentences. Circle the adjective which compare things. Underline the adverbs which compare actions. What is the biggest desert in the world? It is the Sahara Desert. How big is it? It is about 9,000,000 square kilometres in size. Where is the deepest point in the ocean? It is in the Mariana Trench. How deep is it? It is about 11,000 metres deep. Some deep-sea animals are blind, but they can “see” as well as others. Mount Qomolangma is one of the greatest wonders of the world, and it is still growing taller. The Yangtze River travels the farthest in China and is about 6,300 kilometres long. 、 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 The superlative forms of adjectives and adverbs. fast short high light tall slow 直接加- est heavy easy happy hungry early funny 把y 变 i 再加- est 规则变化 A B large late nice 加- st biggest thinnest hottest wettest fattest big thin hot wet fat “双写” 最后一个辅音字母再加-est C D useful interesting beautiful good / well bad / badly many / much little far 在词前加 the most- best worst most least farthest / furthest 不规则变化 E F 、 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 、 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 特殊的形容词比较级 有些形容词有两种不同的比较级和最高级，且代表含义稍有不同： 比较级 最高级 old 老，旧 older 更老的；更旧的 elder 较年长的；较资深的 oldest eldest far 远 farther 更远的 further 更进一步的 farthest furthest late 迟；晚 later 较晚的 latter 后者的 latest last 3.形容词比较级的基本句型 1 原级比较 Snoopy is as tall as his father. 史努比跟他爸爸一样高。 This book is not as interesting as that one.这本书没有那本有趣。 形容词原级 形容词原级 主格A+be动词+as+形容词原级+as+主格B 这个句型是用来表示“A与B一样……”。在be动词后加not即成否定句，表示“A不如B那么……”。（两人或两物作比较时，两者皆须用主格。） 总结：主格A+be动词+as+形容词原级+as+主格B as…as和…一样… 3.形容词比较级的基本句型 2 比较级比较 Rock music is noisier than light music. 摇滚乐比轻音乐要吵。 形容词比较级 Lucy is not younger than Marcie. 露西并不比玛茜年轻。 形容词比较级 总结：主格A+be动词+形容词比较级+than+主格B than 比 主格A+be动词+形容词比较级+than+主格B 这个句型是用来表示“A比B更……”。在be动词后面加not即成否定句，表示“A不比B更……”。 注意 ①and 只在百位和十位之间。 ②十位和个位之间要有连字符。 ③逗号之间并列写即可，无 and 和连字符。 ④hundred、thousand、million、billion前面有具体的数字时，用单数；后面有of时，用复数。 大数字 1．大数字的读法 大数字 2．含小数点的数字读法 （1）小数点读 point； （2）小数点右面的小数部分按照个位基数词依次读出； （3）小数点后面遇到 0时，可读 zero，可读字母 O。 2,506,981,765.34 读作：two billion, five hundred and six million, nine hundred and eighty-one thousand, seven hundred and sixty-five point three four 15 Part Two 副词的比较级与最高级 较大数字的表达与读法 1. 从数字的右端向左数，每三位数加一个逗号。 2. 从右向左，第一个逗号处读thousand(千)，第二个逗 号处读million(百万)，第三个逗号处读billion(十亿)。 3. 读的时候通常在hundred后加and，如果百位数为0， 则在thousand后加and。 大于一千的基数词的表达法 4.英语中没有直接表示“万”和“亿”的单位词，而要用thousand 和million来表达，如“一万”用“ten thousand”、“一亿”用“one hundred million”。 2,674→two thousand six hundred and seventy-four 164,213,430→ one hundred and sixty-four million, two hundred and thirteen thousand, four hundred and thirty 18,357,089→ eighteen million, three hundred and fifty-seven thousand, and eighty-nine 5,204,000,000→five billion two hundred and four million 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 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 ________ 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! largest closer large scary amazing far close loud louder louder far scariest most amazing 1.什么是副词比较级与最高级？ 用来修饰动词的情态动词与形容词一样，都有“原级”“比较级”及“最高级”之分，可以用来描述动作进行状态的程度。 fast faster fastest 2.副词比较级与最高级的变化方式 副词的变化方式，可分为规则变化与不规则变化两种： 1.规则变化 单音节副词比较级在原级词尾加er，最高级在词尾加est fast faster fastest hard harder hardest 4d Write some questions to compare places. Then ask a partner your questions. ·What is the highest ...? ·Which park is bigger, ... or ...? ·... cubic、mile、pool 词汇 形容词和副词 的比较等级 语法 形容词和副词的比较级、最高级的构成 形容词和副词比较等级的用法 ·规则变化 ·不规则变化 ·原级 ·比较级 ·最高级 比较结构的同义转换 一、用所给词的适当形式填空。(11分) 1. The city has the second (large)population in the country. 2. [天津中考改编] Lingling is one of the ___________ (helpful) students in my class. She is always ready to offer help. largest  most helpful 3.[郑州模拟改编] Young people add some bright lights and loud music to make the dance show much _________ (exciting). 4. The weather today is hot, but tomorrow will be even (hot). 5. Cindy is as (outgoing) as her mother.They both enjoy talking with others. more exciting hotter outgoing 1.( )—Can you teach me how to improve spoken English? —The more you practice, ____ it becomes. A. the worse B. the worst C. the better D. the best C 二、选择题 12.( )Look! There is a small ____ in the park. Some ducks and fish are swimming in it. A. hill B. road C. pool D. sea C 13.( )［天津中考］Lingling is one of ____ students in my class. She is always ready to offer help. A. helpful B. more helpful C. less helpful D. the most helpful D 14.( )Among all the students in our class, Lily runs ____, and Lucy runs ____ than most of us. A. faster; fastest B. fastest; faster C. the faster; the fastest D. the fastest; the faster B Look at the table below and make sentences by using comparatives and superlatives. (5 sentences at least) The Nile The Amazon River the Yangtze River the Yellow River 6,671 km 6,440 km 6,300 km 5,464 km $