Unit 4 Section A (语法) 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 4a-4d Read and Learn The Yangtze River 长江 6300 km The Yellow River 黄河 5464 km The Zhujiang River 珠江 2320 km The Zhujiang River is ________ than the Zhujiang River. The Yangtze River is __________ than the Yellow River. The Yangtze River is the __________ of all. shorter longer longest 比较级与最高级的区别： 比较级：_____者比较。 最高级：_____者或_____者以上比较。 两 三 三 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. 4a Read and Complete 形容词/副词 比较级/最高级 How can we use them correctly? Read and Learn 形容词、副词的比较级和最高级 形容词和副词通常有三种级别： 1. 原级(Positive Degree): 形容词 / 副词本身的原形，不做任何比较， 只描述人 / 事物原本的特征、状态。 2. 比较级(Comparative Degree)：在两者之间进行比较，表示“更……”。3. 最高级(Superlative Degree)：在三者或三者以上中比较, “最……”。 Look and Learn 比较级和最高级的构成 规则变化 2. 以不发音的e结尾加-r，-st。 big— _______ — _______ 1. 一般在词尾直接加-er，-est。 high— ______ — ______ great— ______ — _______ nice— ______ — ______ huge— ______ — ______ higher highest greater greatest nicer nicest huger hugest 3. “一辅重闭” 作尾巴，双写尾字母，再加-er，-est。 bigger biggest 大big热hot天，胖子fat瘦thin了， 瘦子纤细slim了，眼红red脸湿wet了 Look and Learn 4. 以辅音字母加y结尾，改y为i再加-er，-est。 heavy— ________ — ________ heavier heaviest 5. 双多音节字太长, 前加 more或 most比其它强。 beautiful— ______________ — ______________ more beautiful most beautiful 原级 比较级 最高级 good / well many / much bad / badly little (少) old far 不规则变化 better best more most worse worst less least older/elder oldest/eldest farther/further farthest/furthest Look and Practice 1. thin __________ _________ 2. fast __________ __________ 3. low __________ __________ 4. deep __________ __________ 5. easy __________ __________ 6. late __________ __________ 7. happy __________ _______ 8. hot __________ __________ 9. little __________ __________ 10. well __________ __________ 11. far _______________ ________________ 12. amazing _______________ ________________ 13. wonderful ______________ ________________ lower lowest deeper deepest easier easiest farther/further farthest/furthest happier happiest hotter hottest later latest more amazing most amazing more wonderful most wonderful better best less least thinner thinnest faster fastest 比较级的用法 Look and Learn 1. 形容词或副词的原级比较 这条湖泊和那条湖泊一样大 这条湖泊不如那条湖泊大。 The lake is as large as that lake. The lake isn’t as/so large as that lake. 2. 比较级+than 尼罗河比长江长。 The Nile River is longer than the Yangtze River. 猎豹比兔子跑得更快。 The cheetah runs faster than the rabbit. Look and Learn 5. Which/Who... + 比较级, A or B? 表示“ A和B哪个/谁更……？” 哪个城市更大，上海还是北京？ Which city is bigger, Shanghai or Beijing? 哪个动物跑得更快，猎豹还是兔子？ Which animal runs faster,the cheetah or the rabbit? 3. “比较级+and+比较级(单音节词和部分双音节词)” 或 “more and more+原级(多音节词和部分双音节词)”, 表示“越来越……”。 她越来越漂亮。 She becomes more and more beautiful. 天气变得越来越冷。 It is getting colder and colder. 4. “the +比较级...，the+比较级..”, 表示“越……,就越……”。 你学习越努力，就会越优秀。 The harder you study, the better you will be. Look and Practice 用所给词的适当形式填空。 1. This movie is ____________ (exciting) than that one. 2. It is getting ________ and ________ (warm) as spring comes. 3. The ____________ (careful) you are, the ________ (few) mistakes you will make. 4. This building is three times ________ (tall) than the old one. 5. The ________ (short) of the two pencils is for you. more exciting warmer warmer more careful fewer taller shorter Look and Learn 最高级的用法 1. (the+)最高级(+名词)+in/of/among 短语，意为“……中最……的”。 这是城市里最美的公园。 This is the most beautiful park in the city. 他是班里跑得最快的。 He runs (the) fastest in his class. 2. the +序数词+形容词最高级+可数名词单数+in/of 短语, 意为“在…中是第几……的……” 黄河是中国第二长河。 The Yellow River is the second longest river in China. 3. “Which/Who...(the+)最高级，A, B or C?” 意为“哪个/谁是最......,A,B还是C？”。 语文、数学和英语哪个最有趣？ Which is the most interesting, Chinese, math or English? Look and Learn 4. one of the +形容词最高级+可数名词复数+in/of 短语，“……中最…的……之一”。 生长速度最快得植物之一是竹子。 One of the fastest-growing plants is bamboo. Lily是这三个女孩中最细心的一个。 Lily is one of the most careful girls of the three. 【注意】 (1)最高级前有物主代词、名词所有格等修饰时，其前不加the。 The Yangtze River is China’s longest river. (2)当most表示“非常”时，其前不加the, 使用a+most+名词。 It is a most useful book. Look and Learn (3) “比较级+than any other+可数名词单数” = “比较级+than the other+可数名词复数”表示“比其他任何……都……”, 表示最高级含义， 可与表示最高级句子进行转换。 He is the tallest one in my class. =He is taller than any other member in my class. =My father is taller than the other members in my class. (4)可用于修饰形容词和副词比较级程度的副词（短语）有: much, a little/a bit ， even, a lot, 等。 She runs much faster than her brother. 她比她弟弟跑得快得多。 用所给词的适当形式填空。 Exercise 1.(2025·扬州中考) The international influence of Yangzhou is getting ________ than before. (strong) 2.(2025·德阳中考改编) Lin Tao runs ________(fast) than his classmates. He is the running star in his class. 3.(2025·达州中考) The Yangtze River is the ________(long) river in China. 4.(2025·白银中考) The more we communicate with our parents, the _______ (good) we'll understand each other. 5.(2025·成都中考改编) Miss Li always has a lot of work to do. For her, nothing is _______________(important) than a proper plan. 6.(宁波中考改编) For most of the students, June is always the ________(busy) month in a year. 7.Qian Xuesen, father of China's space program, is one of the ________(great) scientists in the world. stronger faster longest better more important busiest greatest 句型转换。 1. He is the tallest boy in his class.（改为同义句） He is ________ than ________ ________ boy in his class. 2. This is one of the most popular songs.（改为特殊疑问句） ______ ____ one of ________ ________ popular ________? 3. The Yangtze River is longer than any other river in China.（改为最高级） The Yangtze River is ________ ________ river in China. 4. Who is the most hard-working, Lily, Lucy or Jack?（回答：Jack...） ________ is the most hard-working ________ the three. 5. He runs faster than the other members.（改为同义句） He runs ________ than ________ ________ member. taller any other Which is the most songs the longest Jack of faster any other Here are some large numbers about natural wonders. Do you know how to spell them correctly? 大数字 Look and Learn 较大数字的表达与读法 1.数字从后往前数，每三位标一个逗号。 2.从后往前，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。 英语中,“几百、几千、几百万、几十亿”都不加“s”; 并且没有直接表示“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”。 Look and Practice 3,528 → ______________________________________________ 656,218,530 → ______________________________________________ ______________________________________________ 9,767,049 → ______________________________________________ ______________________________________________ eighty-eight thousand, five hundred and sixty-six→ _________________ ten million, three hundred and ninety-seven thousand→ _____________ three thousand five hundred and twenty-eight six hundred and fifty-six million, two hundred and eighteen thousand, five hundred and thirty ninety million, seven hundred and sixty-seven thousand, and forty-nine 88,566 10,397,000 4b Read and Write 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 乞力马扎罗山 /maʊnt ˌkɪlɪmənˈdʒɑːrəʊ/ 25,768 /ˈkjuːbɪk/ 向下倾注 pour down /ˈɪŋɡə fɔːlz/ 印加瀑布 /rɪft/ /ˈvæli/ 东非大裂谷 four thousand /ˌtæklɪˈmɑːkən/ 塔克拉玛干沙漠 three hundred and thirty-seven thousand have a total area of ...总面积达...... Watch and Answer What natural wonder is this? It’s Victoria Falls. 维多利亚瀑布 /vɪkˈtɔːriə/ My friend shared his experience of visiting Victoria Falls last year. Could you help me complete his story? 维多利亚瀑布 Read and Complete 4c Complete the passage with the correct forms of the words in the box. One word is used more than once. large 　amazing　 far　 close 　loud 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 louder. 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! Tip: 首先，把握文章整体语境。然后，关注空格前后词语搭配、语法结构，从方框中选择符合句意的单词并换成正确形式。最后，通读全文，检查语义、语法是否正确。 largest closer louder far most amazing 词 讲 It went on for as far as the eye could see.它一眼望不到头。（教材P35 4c） as far as... 远至（某处） Language points 拓展：as far as... 就……的限度，到……的程度 相关短语&例句 as far as we know 据我们所知 as far as I can see 依我看 You’d better learn as much as you can. 你应该尽可能多地学习。 1. As far as we know, the Sahara is the biggest desert in the world. 据我们所知，撒哈拉沙漠是世界上最大的沙漠。 2.As far as I can see, there is no difference between the two computers. 依我看，这两台电脑没有差别。 Now it’s your turn to ask questions. Can you design some interesting questions to compare different natural wonders with your partner? 4d Write some questions to compare places. Then ask a partner your questions. •What is the highest/deepest/largest...? •Which park is bigger, ... or ...? •Is ... longer/bigger/higher/lower... than ...? You can use these to search for useful information: ... Don’t let your ______ control you. Try to calm down. Rivers run longer than streams, mountains stand higher than hills,and the most beautiful view in life belongs to those who keep going. Thank you! Basic(必做) 绘制思维导图总结本堂课的重点词汇和核心语法。 Improving(选做) 利用形容词的比较级和最高级，比较国内外同类型的自然景观。 Extend(必做) 利用网络资源搜寻我国最具特色的自然景观并在班级分享。 Homework $