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

该初中英语课件围绕“自然奇观”主题，聚焦形容词副词比较级、最高级用法及大数字读法，通过“自然奇观问题导入—比较等级构成规则梳理—用法示例解析—分层练习应用”的脉络，搭建从基础到综合运用的学习支架。 其亮点在于将语法教学与自然主题深度融合，如用维多利亚瀑布、乞力马扎罗山等实例解析比较级，结合中考题和短文填空强化应用，既提升语言能力又渗透文化意识。任务型活动如编写比较对话，助力思维品质发展，分层作业设计兼顾不同学生学习能力，学生能在真实语境中掌握语法，教师可借助清晰结构和丰富实例优化教学。

Section A (Grammar Focus) The Wonders of Nature 1 1. review the usage of the comparatives and superlatives. 2. master the rules about how to read large numbers in English. 3. talk about more natural wonders and places using the target language. 行业PPT模板http://www.1ppt.com/hangye/ 行业PPT模板http://www.1ppt.com/hangye/ 单击此处编辑母版标题样式 单击此处编辑母版文本样式 单击此处编辑母版文本样式 二级 三级 四级 五级 小红书:Christina在努力|原创课件 更多教学资源可以关注分享~ 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. Adjectives (to compare things) Adverbs (to compare actions) biggest, deepest, greatest, taller well, farthest num.+单位词+adj. =num.+单位词+prep.+n. deep= high= wide= long= big= in depth in height in width in length in size 行业PPT模板http://www.1ppt.com/hangye/ 行业PPT模板http://www.1ppt.com/hangye/ 单击此处编辑母版标题样式 单击此处编辑母版文本样式 单击此处编辑母版文本样式 二级 三级 四级 五级 小红书:Christina在努力|原创课件 更多教学资源可以关注分享~ 形容词和副词的比较等级 Let’s learn 英语中的形容词和副词常用三种形式来表达事物的等级差别, 即原级、比较级和最高级。 原级:没有比较含义; 比较级:两者间比较,表示“较……”或“更……”; 最高级:三者及三者以上比较,表示“最……”,形容词最 高级前一般要加定冠词 the,副词最高级前的 the 可以省略。 小红书:Christina在努力|原创课件 更多教学资源可以关注分享~ 4 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 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 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 Look and Practice 、 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 行业PPT模板http://www.1ppt.com/hangye/ 行业PPT模板http://www.1ppt.com/hangye/ 单击此处编辑母版标题样式 单击此处编辑母版文本样式 单击此处编辑母版文本样式 二级 三级 四级 五级 比较级的用法 1. 形容词或副词的比较级+than The Nile River is longer than the Yangtze River. 尼罗河比长江长。 2. the + 比较级 + of the two (+ 名词复数) 表示“两者中较……的那个”。 This is the longer of the two rivers. 这是两条河流中更长的那条。 The taller of the two students is my best friend. 这两个学生中更高的那个是我最好的朋友。 3. Which/Who... + 比较级, A or B? 表示“ A和B哪个/谁更……?” Which is easier, Chinese or math? 语文和数学,哪个更容易? 比较级 行业PPT模板http://www.1ppt.com/hangye/ 行业PPT模板http://www.1ppt.com/hangye/ 单击此处编辑母版标题样式 单击此处编辑母版文本样式 单击此处编辑母版文本样式 二级 三级 四级 五级 6. A + be + 倍数 + 形容词比较级 + than + B 表示“A是B的……倍……”。 This river is twice longer than that small river. 这条河比那条小河长两倍。 The elephant is four times heavier than the horse. 大象比马重四倍。 4. “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……”。 She becomes more and more beautiful. 她越来越漂亮。 It is getting colder and colder. 天气变得越来越冷。 5. “the +比较级...,the+比较级..”, 表示“越……,就越……”。 The harder you study, the better you will be. 你学习越努力,就会越优秀。 行业PPT模板http://www.1ppt.com/hangye/ 行业PPT模板http://www.1ppt.com/hangye/ 单击此处编辑母版标题样式 单击此处编辑母版文本样式 单击此处编辑母版文本样式 二级 三级 四级 五级 最高级的用法 1. (the+)最高级(+名词)+in/of 短语,意为“……中最……的”。 This is the most beautiful park in the city. 这是城市里最美的公园。 He runs (the) fastest in his class. 他是班里跑得最快的。 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……” The Yellow River is the second longest river in China. 黄河是中国第二长河。 3. “Which/Who...(the+)最高级,A, B or C?” 意为“哪个/谁是最......, A,B还是C?”。 Which is the most interesting, Chinese, math or English? 语文、数学和英语哪个最有趣? 行业PPT模板http://www.1ppt.com/hangye/ 行业PPT模板http://www.1ppt.com/hangye/ 单击此处编辑母版标题样式 单击此处编辑母版文本样式 单击此处编辑母版文本样式 二级 三级 四级 五级 4. one of the +形容词最高级+可数名词复数+in/of 短语,意为“……中最…的……之一”。 This is one of the most interesting books in the library. 这是图书馆里最有趣的书之一。 Lily is one of the most careful girls of the three. Lily是这三个女孩中最细心的一个。 【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。 It is a most useful book. 行业PPT模板http://www.1ppt.com/hangye/ 行业PPT模板http://www.1ppt.com/hangye/ 单击此处编辑母版标题样式 单击此处编辑母版文本样式 单击此处编辑母版文本样式 二级 三级 四级 五级 (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, 可与表示最高级的句子进行转换。 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, even, a lot, a bit, far等。 She runs much faster than her brother. 她比她弟弟跑得快得多。 行业PPT模板http://www.1ppt.com/hangye/ 行业PPT模板http://www.1ppt.com/hangye/ 单击此处编辑母版标题样式 单击此处编辑母版文本样式 单击此处编辑母版文本样式 二级 三级 四级 五级 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 行业PPT模板http://www.1ppt.com/hangye/ 行业PPT模板http://www.1ppt.com/hangye/ 单击此处编辑母版标题样式 单击此处编辑母版文本样式 单击此处编辑母版文本样式 二级 三级 四级 五级 挑战二:写用所给词的适当形式填空。 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 most of 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.(宁波中考政编)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 15 Complete the passage with the correct forms of the words in the box. 4c 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 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 louder far most amazing 维多利亚瀑布 go close to 靠近;接近 就在眼前;眼皮底下 as far as the eye can/could see 极目所尽 at the top of 在...的顶部 16 Language points 教材 P35 4c 1. It went on for as far as the eye could see. 它一眼望不到头。 as far as... 远至(某处) e.g. There was a fire in the mountain, which came up as far as our village. 山里发生了火灾,都蔓延到我们村了。 拓展:as far as... 就.....的限度,到......的程度 as far as I/we know 据我/我们所知 as/so far as I can see 依我看 e.g. 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。(眉山中考) 练习:依我看,这两台电脑没有差别。 _, there is no difference between the two computers. As far as I can see 17 Let’s think 试着读出画横线部分的大数字?你能发现什么规律? How big is it? It is about 9,000,000 square kilometres in size. How deep is it? It is about 11,000 metres deep. The Yangtze River travels the farthest in China and is about 6,300 kilometres long. 读作:nine million 读作:eleven thousand 读作:six thousand and three hundred Grammar (二) 较大数字的表达与读法 大于1000的基数词的表达法 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。 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”。 19 1. 45, 390 _ 2. 6, 425, 137 _ 3. 13, 057, 018 _ 4. three million, five hundred thousand and ninety-two _ 5. twenty-eight thousand, six hundred and fifty-six _ 6. forty million, four hundred and twenty-four thousand _ 写出或读出下列数字。 forty-five thousand, three hundred adn ninety six million, four hundred and twenty-five thousand, one hundred and thirty-seven thirteen million, fifty-seven thousand and eighteen 3, 500, 092 28, 656 40, 424, 000 20 Write or spell out the numbers. 4b 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 three hundred and thirty-seven thousand 25, 768 four thousand 乞力马扎罗山 立方米 pour down 倾泻而下 英加瀑布 东非大裂谷 has a total area of... 总面积为…… 21 Write some questions to compare places. Then ask a partner your questions. 4d What is the highest...? Which park is bigger, ... or ...? 疑问词(组)+谓语动词+比较级,A or B? A和B,……更……? 22 A: What is the highest tower in China? B: It’s the Shanghai Tower. A: Which park is bigger, Hyde Park or Greenwich Park? B: Hyde Park. A: What’s the deepest lake in the world? B: It’s Lake Baikal. A: Which river is longer, the Yangtze River or the Nile River? B: The Nile River. 活动示范 Exercises 1. The town is about 50 _ (kilometre) away from the city. 2. The restaurant is as _ (close) as the post office, just next door. 3. The lake is much _ (deep) after the heavy rain. 4. That was the _ (amazing) painting in the whole museum. 5. It is one of the biggest _ (pool) in this city. I. 用括号中所给单词的适当形式填空。 kilometres close deeper most amazing pools 24 Changing Amazon According to a new study, the Amazon Rainforest may become grassland in a few years. The Amazon Rainforest is the world’s 1._ (big) rainforest. Climate change and human 2._ (activity) make it “sick”. Usually, the rainforest can fix 3._ (it). But now, it feels too “tired”to get better. The trees may die and the rainforest could turn into a hot,dry grassland. Why is the Amazon “sick”? The Amazon Rainforest is one of the 4._ (wet) places on earth. But since 2005, three droughts have hit the rainforest. Scientists 5._ (discover) that the changing environment caused these droughts. biggest Exercise activities itself wettest discovered 小红书:Christina在努力|原创课件 更多教学资源可以关注分享~ The trees don’t have enough water to grow. What’s 6._ (bad), as they become dry, they can 7._ (easy) catch fire. On top of this, people cut down rainforest trees 8._ wood (木材). They burn the forest to make farmland. All these actions have caused about 17% of the rainforest to disappear. What will happen if we lose it? The Amazon Rainforest is like the lungs (肺) of our planet. If the Amazon Rainforest “dies”, there will be more CO2 and our earth will become even 9._ (hot). The Amazon Rainforest is also home to about 3 million animals 10._ plants. Many of them can’t live anywhere else. They will very likely just disappear. Exercise worse easily for hotter and 小红书:Christina在努力|原创课件 更多教学资源可以关注分享~ Homework 1. 基础层:背诵4c短文,默写4个生词+比较级/最高级变化规则。 2. 提高层:仿照4d,写5组比较中国地理景观的对话(如 长江vs黄河,黄山vs泰山)。 3. 拓展层:用英语介绍一个自己喜欢的自然奇观,包含比较级 /最高级+大数字(80词左右)。 27 $