八年级英语下册Unit7What’sthehighestmountainintheworld课件 24页

Unit 7 What’s the highest mountain in the world? Section A Period 3 1 Revision What have you learnt in the last period? Let’s review something important? 1 Presentation Now let’s review the comparative and superlative together.! 形容词和副词的比较级和最高级 1. 大多数形容词和副词都有三个级 1) 原级: 常用结构as...as... “和..….一样” Zhang Hong is as tall as Tom. 张红和汤姆一样高。 2) 比较级 (用于两者之间的比较) 常用结构：比较级＋than ... He is taller than I. 他比我高。 Grammar 3) 最高级(用于三者或三者以上的比较)， 常用结构: the + 最高级＋of / in ... He is the tallest of the three. 他是这三个人中最高的。 He is the funniest in his class. 他是他们班最有趣的。 2. 形容词、副词比较级和最高级的构成 a) 规则变化 1) 一般情况下，单音节或双音节的形容词 （或副词）比较级＋er ， 最高级＋est clever－cleverer－cleverest few－fewer－fewest small－smaller－smallest等 2) 以e结尾的词，比较级＋r，最高级＋st 即可 nice－nicer－nicest cute－cuter－cutest large－larger－largest 3) 以辅音字母＋y结尾的变y为i＋er或est easy－easier－easiest happy－happier－happiest early , busy , heavy , dirty , lazy也如此 4) 以一个辅音字母结尾的重读闭音节，双 写辅音字母＋er 或 est的词 1. fat－fatter－fattest 2. thin－thinner－thinnest 3. hot－hotter－hottest 4. red－redder－reddest 5. wet－wetter－wettest 6. big－bigger－biggest 5) 多音节和部分双音节的词需要在形容词 原级前＋more构成比较级，＋the most构 成最高级 beautiful － more beautiful － the most beautiful delicious, popular, important, interesting, expensive, creative 双音节的词 careful － more careful － the most careful useful － more useful － the most useful 少数单音节词也是这样 pleased－ more pleased － the most pleased tired－more tired －the most tired b) 不规则变化： good —better — best well —better — best bad－worse － worst many, much — more — most far — farther —farthest (距离远) far — further — furthest (程度深) old — elder — eldest (长幼) old — older —oldest (年龄) 形容词和副词比较等级的常用结构 1. “比较级+ than any other +名词+其他” 表示“比其他任何一个……都……” 该结构可与“the+最高级+其他”相互转 换 The bag is cheaper than any other bag in the store. =The bag is the cheapest in the store. 2. “比较级 + and + 比较级”表示“越来 越……” The earth is getting warmer and warmer. 地球变得越来越暖和。 3. “the + 比较级, the + 比较级”表示 “越……， 就越……” The more you practice, the better you’ll play the piano. 4. “the + 比较级 + of the two”表示“两者 之中更……的那一个” Susan is the taller of the two girls. 5. “数词 + times + 比较级 + than”表示 “……是……的几倍” The elephant weighs ten times more than the panda. 6. “one of the + 形容词最高级 + 复数 名词”意为“最……之一” It is one of best theaters in our town. 7. “the + 序数词 + 最高级 + 单数名词 + in …”表示“是……中的第几……” The Yellow River is the second longest river in China. 2 Practice Fill in the blanks with the correct forms of the words in the box.4a big much popular long old high 1.The Amazon River is one of the _______ rivers in the world. It’s a little _____ than the Yangtze River. 2.Qomolangma is 8,848.43 meters _____. It’s one of the most ________ places for serious mountain climbers. longest longer high popular big much popular long old high 3. No ocean in the world is as ___ as the Pacific Ocean. 4. Although Japan is _____ than Canada, it is _____ smaller. big older much Write two comparisons about two topics. Write true facts. 4b Two cities: Singapore and Kuala Lumpur(吉隆坡) 1.Kuala Lumpur is as modern as Singapore. 2.Singapore is bigger than Kuala Lumpur and has a larger population than Kuala Lumpur. For example: 策略：可以比较城市的 面积、人口、历史等 Two animals: Monkey and Dog 1. A dog is bigger than a monkey. 2. A monkey is smaller than a dog, but it climbs a tree faster than a dog. 策略：可以比较动物的身高(身 长)、体重、奔跑速度、外貌特 征以及寿命等 Pair work4c Write five questions using comparisons. Then ask your partner your questions. 1.What is the highest building in our city? 2.What is the largest shopping mall in our city? 3.Which is the biggest park in our city? 4.Which is the longest road in our city? 5.What’s the biggest city in China? ... 注意：在使用比较级或 最高级时要有相对明确 的比较范围或参照物 3 Summary Let’s learn what we have learnt today! Homework 1. Review the new words and expressions. 2. Preview the new words of section B