人教版八年级下册英语unit7 Section A 3ppt课件.ppt

1、Whats the highest mountain in the world? Qomolangma. How high is Qomolangma? Its 8,844.43 meters high. Its higher than any other mountain. Which is the deepest salt lake in the world? The Caspian Sea is the deepest of all the salt lakes. Did you know that China is one of the oldest countries in the

2、world? Yes, I did. Its much older than the US. 大多数形容词有三个级。大多数形容词有三个级。 1. 原级原级: Structure : as . as. 像像.一样一样 e.g. Tim is as tall as Tom. 2. 比较级比较级 (用于两者之间的比较用于两者之间的比较): Structure：形容词比较级形容词比较级 than . e.g. This box is bigger than that one. 3. 最高级最高级(用于三者或三者以上的比较用于三者或三者以上的比较): Structure: the + 形容词的最高级形容

3、词的最高级of / in . e.g. Tom is the heaviest in our class. He is the most popular in our school. 规则变化规则变化 1) 一般情况下，一般情况下，单音节或双音节的形容单音节或双音节的形容 词词/副词比较级副词比较级er， 最高级最高级est。如。如: clever cleverer cleverest few fewer fewest small smaller smallest 等。等。 2) 以以e结尾的词结尾的词，比较级比较级r，最高级最高级st 即可。即可。 如：如： nice nicer nices

4、t cute cuter cutest large larger largest 3) 以以辅音字母辅音字母y结尾的结尾的变变y为为ier或或est 如如: easy easier easiest happy happier happiest 再如：再如：early, busy, heavy, dirty, lazy 也如也如 此。此。 4) 重读闭音节，单辅音结尾的，重读闭音节，单辅音结尾的，双写这双写这 个辅音字母个辅音字母er 或或 est的词：的词： fat fatter fattest thin thinner thinnest hot hotter hottest red redd

5、er reddest wet wetter wettest big bigger biggest 5) 多音节和部分双音节的词多音节和部分双音节的词需要在形容词需要在形容词 原级前原级前more 构成构成比较级比较级，the most 构构 成成最高级最高级。如：。如： beautiful more beautiful the most beautiful 又如又如: delicious, popular, important, interesting, expensive, creative 双音节双音节的词如的词如: careful more careful the most carefu

6、l useful more useful the most useful 少数单音节词少数单音节词也是这样，如：也是这样，如： pleased more pleased the most pleased tired more tired the most tired b) 不规则变化：不规则变化： good better best well better best bad worse worst many/much more most far farther farthest (距离远距离远) far further furthest (程度深程度深) old elder eldest (长幼

7、长幼) old older oldest (年龄年龄) 1.三者或三者以上相比，表示最高程度三者或三者以上相比，表示最高程度 时，用时，用“the + 最高级”最高级”的结构表示。的结构表示。 这种句式一般常有表示比较范围的介这种句式一般常有表示比较范围的介 词短语。例如：词短语。例如： Zhang Hua is the tallest of the three. He works (the) hardest in his class. 2. 最高级可被最高级可被序数词序数词以及以及 much，by far， nearly，almost，by no means，not quite， not r

8、eally，nothing like 等词语所修饰。等词语所修饰。 例如：例如： This hat is by farmuchnearly almostnot nearlyby no meansnot quitenothing like the biggest. How much did the second most expensive hat coat? 3. 表示“最高程度”的形容词，如表示“最高程度”的形容词，如 excellent，extreme，perfect等，没有最高等，没有最高 级，也不能用比较级。级，也不能用比较级。 4. 形容词最高级修饰作表语或介词宾语的形容词最高级修饰

9、作表语或介词宾语的 名词、代词时，被修饰的词往往省略。名词、代词时，被修饰的词往往省略。 e.g. He is the tallest (boy) in his class. 5. 作状语的副词最高级前可以不加定冠词。作状语的副词最高级前可以不加定冠词。 e.g. Of all the boys he came (the) earliest. 1. 比较级考点比较级考点 比较级修饰问题比较级修饰问题 a little, a bit, even, still, much, a lot, far 等可修饰比较级。等可修饰比较级。 e.g. Tom is a little taller than J

10、im. This book is much more interesting than that one. 同级比较同级比较 e.g. The weather in Beijing is colder than that in Xian. Our school is bigger than yours. the + 比较级比较级 e.g. Lucy is the fatter of the two girls. “a/an + 比较级”比较级” 表示“又一，再一”表示“又一，再一” e.g. Lily has a doll, but she wants a bigger one. 隐性比较（没

11、有隐性比较（没有than的情况）的情况） e.g. Who runs faster, Lucy or Lily? Youd better come earlier next time. He worked hard last term, but he works even harder this term. 越来越越来越. a. 比较级比较级 + and + 比较级比较级 b. the + 比较级比较级 + 句子，句子，the + 比较级比较级 + 句子句子 a.e.g. Its getting colder and colder. The more you exercise, the bet

12、ter you are. 2. 最高级考点最高级考点 说明：形容词的最高级前必须加说明：形容词的最高级前必须加the；副；副 词的最高级前省略词的最高级前省略the。 范围问题范围问题 e.g. Tom is the tallest student in the class. Spring is the best season of the year. “.之一”问题之一”问题 e.g. Beijing is one of the biggest cities in the world. “the + 序数词序数词 + 最高级”最高级” e.g. I think he is the secon

13、d tallest boy in his class. 3. 比较级和最高级的转换比较级和最高级的转换 e.g. Tom is the tallest student in the class. = Tom is taller than any other student in the class. = Tom is taller than all the other students in the class. = No other students are taller than Tom. 总结：总结： any other + 名词单数名词单数 the other + 名词复数名词复数 否

14、定否定 + 比较级比较级 = 最高级最高级 比较级比较级 + 极限极限 = 最高级最高级 同级比较同级比较 as + adj./adv. + as e.g. She is as thin as Lily. He writes as carefully as Linda. not + as/so + adj./adv. + as e.g. Tony didnt run so fast as Carter. 1. Our family has bought a car so we can travel _ than before.（2008陕西）陕西） A. most easily B. less

15、 easily C. easily D. more easily 2. My father told me a story last night. It is _ one Ive ever heard.（2009陕西）陕西） A. the funniest B. funniest C. funnier D. the funnier D A 3. The _ friends you have, the _ you will be.（2010陕西）陕西） A. more, happy B. many, happy C. more, happier D. many, happier 4. When

16、he heard a cry for help, he ran out as _ as he could.（2011陕西）陕西） A. hardly B. quickly C. finally D. slowly C B 5. This place is not big enough for Lucys birthday party. We should find a _ one.（2012陕西）陕西） A. big B. small C. bigger D. smaller C Fill in the blanks with the correct forms of the words in

17、 the box. big much popular long old high 1. The Amazon River is one of the _ rivers in the world. Its a little _ than the Yangtze River. 2. Qomolangma is 8,844.43 meters _. Its one of the most _ places for serious mountain climbers. longest longer high popular 4a 3. No ocean in the world is as _ as

18、the Pacific Ocean. 4. Although Japan is _ than Canada, it is _ smaller. big older much 太平洋太平洋 n. 大海；海洋大海；海洋 Write two comparisons about two topics. Write true facts. Two rivers: _ and _ _ _ _ _ _ 4b The Yangtze River is almost as long as the Amazon River. The Amazon is longer than the Yangtze, but t

19、he Yangtze River is the longest river in China. the Yangtze River the Amazon River Two cities: _ and _ 1. _. 2. _ . Two animals: _ and _ 1. _. 2. _ . Write five questions using comparisons. Then ask your partner your questions. 1. _ 2. _ 3. _ 4. _ 5. _ 4c What is the highest building in our city? 1.

20、 She is _ than _. A. busier / us B. busier / we C. more busy / us D. more busy / we 2. Jane is _ than Betty. A. less taller B. less tallest C. less tall D. not as tall 3. China is _ country in the world. A. the third largest B. the largest third C. the third large D. a third largest B A A 4. Which i

21、s _ season in Beijing? I think its autumn. A. good B. better C. best D. the best 5. Which is _, the sun, the moon or the earth? The moon is. A. small B. smaller C. smallest D. the smallest D D 6. I study English as _ as my brother. A. hard B. harder C. hardest 7. Which is _, a bicycle or a computer? A. expensive B. more expensive C. the most expensive 8. The Yellow River is one of _ rivers in China. A. long B. longer C. the longest A B C 1. To memorize the important phrases and sentences. 2. To make some sentences using as as, . times than, less than, more than