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

The Wonders of Nature (Period 3) Section A (Grammar Focus) Translate the following sentences. 长江是中国最长的河流。 它流程最长，长约6 300千米。 黄河长5 464千米，是（中国）第二长河。 它长6 671千米。 The Yangtze River is the longest river in China. It travels the farthest and is about 6,300 kilometres long. The Yellow River is 5,464 kilometres long and is the second longest. It’s 6,671 kilometres long. cubic mile pool adj. 立方的 n. 英里 n. 池塘；水坑 形容词比较级与最高级的变化方式 lazy 形容词的变化方式，可分为规则变化与不规则变化两种： 词尾为辅音+y的形容词，比较级将y改i，再加er,最高级将y改i，再加est 1.规则变化 lazier laziest early earlier earliest 形容词比较级与最高级的变化方式 big 形容词的变化方式，可分为规则变化与不规则变化两种： 短元音+单辅音的单音节形容词，比较级双写词尾加er，最高级双写词尾加est 1.规则变化 bigger biggest fat fatter fattest Grammar Focus 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 blind animals can “see” as well as others. Mount Qomolangma is still growing taller. The Yangtze River travels the farthest in China and is about 6,300 kilometres long. Find the comparatives and superlatives. 形容词比较级与最高级的变化方式 helpful 形容词的变化方式，可分为规则变化与不规则变化两种： 两个音节以上形容词，比较级前面加more，最高级前面加most 1.规则变化 more helpful most helpful famous more famous most famous 形容词比较级与最高级的变化方式 good/well 形容词的变化方式，可分为规则变化与不规则变化两种： 原级 2.不规则变化 better best 比较级 最高级 bad/ ill worse worst many/ much more most little less least Grammar Focus Read and discuss: What can you find? Discuss in your group. 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 blind animals can “see” as well as others. Mount Qomolangma is still growing taller. The Yangtze River travels the farthest in China and is about 6,300 kilometres long. 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。 形容词和副词的比较等级 10 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 形容词和副词的比较等级 单音节词和部分双音节词 多音节词和部分双音节词 一般在词尾加-er或-est 以e结尾的词加-r或-st 以“辅音字母+ y”结尾的双音节词，把y变为i再加-er或-est 以一个辅音字母结尾的重读闭音节词，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 fast→faster→fastest nice→nicer→nicest easy→easier→ easiest big→bigger→ biggest beautiful→more beautiful→most beautiful ·规则变化 1．形容词和副词的比较级、最高级的构成 12 * “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。 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。 形容词和副词的比较级 关联情境串考点 写出或者用英语拼出这些数字。 1. Last month, our school held a book sale, and more than 2,000 (________________________) students took part in the activity. 2. We sold 36,772 (______________________________________________) books in total during the sale. two thousand thirty-six thousand seven hundred and seventy-two 3. The activity raised five hundred and twenty thousand five hundred (____________________) yuan for children in poor areas. 4. We spent two hundred and thirty thousand (______________________) yuan buying new chairs and desks for the school. 520,500 230, 000 * “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. 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. Read and guess. are ______ ______ ________ of all the animals in China. the most famous Pandas They are fat and cute, black and white. They only live in China and are more famous than any other animal to Chinese. People over the world love them and we’re doing our best to look after them. 一、用括号内所给单词的正确形式填空。 1．The more friends you have，the (happy) you will feel. 2．There are as (many) students in our class as in their class. 3．Who can solve this maths problem (quickly) in our class? happier many (the) most quickly 课堂练习 4．I work the (hard) of all the students.Finally，I wrote a report about the Yellow River.My teacher said，“I hope every student could be as (excellent) as her! ” 5．My sister usually does her homework a lot (carefully) than I do. 6．Our school has more than seven (hundred) students. hardest excellent more carefully hundred 二、根据汉语意思完成句子，每空一词。 1．【学科融合】海洋中最深的地方是马里亚纳海沟。 The in the ocean is the Mariana Trench. 2．这个公园总面积有500平方米。 This park of 500 square metres. deepest point has a total area 3．就我记得的，我们下周要进行一场数学测试。 I remember，we will have a maths test next week. 4．实验课上我们不能靠近火源。 We can't the fire in the lab class. 5．那座山的山顶终年积雪。 There is snow the mountain all year round. As far as go close to at the top of Think and guess. It begins at Chang’an. This is an old trading road. is the _______trading route in the world. The main product is silk. oldest The Silk Road friendly sing well hard-working popular thin talented smart funny A: Who is the funniest in your class? B: … A: Who is the thinnest in your class? B: I think … I want to know you! Let’s play a game! Write or spell out the numbers. Mount Kilimanjaro is _______(five thousand, eight hundred and ninety-five) metres high. _______(twenty-five thousand, seven hundred and sixty-eight) cubic metres of water pours down Inga Falls each second. The East African Rift Valley is about 4,000 (____________) miles long. The Taklimakan Desert has a total area of about 337,000 (___________________________________) square kilometres. 5,895 25,768 four thousand three hundred and thirty-seven thousand Why explore nature? Scientists discover 5. (thousand) of new animals and plants every year.By studying them，we understand ecosystems 6. (clear) and learn how to help them 7. (good)．For example，the Amazon Rainforest has 8. (rich) kinds of life in the world，but it's disappearing 9. (quick) than before.Protecting it is 10. (important) job for us all. thousands more clearly better the richest more quickly the most important Homework 1．Make a vocabulary card for comparative and superlative forms，and exchange and fill in the comparative forms with your classmates.Then check it. 2．Describe the differences between two natural wonders in five sentences， using at least three superlative adjectives.　 $