人教版八年级下册 Unit7 What's the highest mountain in the world？ SectionA Grammar focus 4a-4c 课件(共35张PPT)

(共35张PPT)
教学目标
1.掌握用adj.和adv.的比较级和最高级的用法
2.学会用adj.和adv.的最高级来描述个人喜好
Liu Xiang is taller than Zhou Jielun .
Zhou Jielun is tall .
Yao Ming is the tallest of them.
姚明
刘翔
周杰伦
Look and say
— What’s the highest mountain in the world
— Qomolangma.
— How high is Qomolangma
— It’s 8,844.43 meters high. It’s 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 world
— Yes, I did. It’s much older than the US.
大多数形容词有三个级。
1. 原级:(文中或句中的第一者）
Structure : as ... as... 与..….一样
e.g. Tom is tall.
Tim is as tall as Tom.
2. 比较级 (用于两者之间的比较):
Structure：形容词比较级＋ than ...
e.g. This box is bigger than that one.
3. 最高级(用于三者或三者以上的比较):
Structure:
the + 形容词的最高级＋of / in /among...
e.g. Tom is the heaviest in our class. He is the most popular in our school.
规则变化
1) 一般情况下，单音节或双音节的形容词/副词比较级＋er， 最高级＋est。如:
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。 如：
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 如: easy — easier — easiest
happy — happier — happiest
再如：early, busy, heavy, dirty, lazy 也如此。
4) 重读闭音节，单辅音结尾的，双写这个辅音字母＋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。如：
beautiful － more beautiful － the most beautiful
又如: delicious, popular, important, interesting, expensive, creative
双音节的词如: careful － more careful － the most careful useful － more useful － the most useful
少数单音节词也是这样，如：
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 /badly— 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)
三者或三者以上相比，表示最高程度时，用“the + 最高级”的结构表示。这种句式一般常有表示比较范围的介词短语。例如：
Zhang Hua is the tallest of the three.
He works (the) hardest in his class.
3. 表示“最高程度”的形容词，如 excellent，extreme极端的，非常的，perfect等，没有最高级，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。
e.g. Of all the boys he came (the) earliest.
比较级的判断
① 比较级修饰问题 a little, a bit, even, far，much, a lot, 等可修饰比较级。
e.g. Tom is a little taller than Jim. This book is much more interesting than that one.
② 同级比较（......than.......)
e.g. The weather in Beijing is colder than that in Xi’an. Our school is bigger than yours.
③ the + 比较级
e.g. Lucy is the fatter of the two girls.
④ “a/an + 比较级” 表示“又一，再一”
e.g. Lily has a doll, but she wants a bigger one.
⑤ 隐性比较（没有than的情况）
e.g. Who runs faster, Lucy or Lily You’d better come earlier next time. He worked hard last term, but he works even harder this term.
⑥ 越来越......
比较级 + and + 比较级
b. the + 比较级 + 句子，the + 比较级 + 句子
e.g. It’s getting colder and colder. The more you exercise, the better you are.
2. 最高级考点
说明：形容词的最高级前必须加the；副词的最高级前省略the。
① 范围问题 in of among
e.g. Tom is the tallest student in the class. Spring is the best season of the year.
② “......之一”问题
e.g. Beijing is one of the biggest cities in the world.
③ “the + 序数词 + 最高级”
e.g. I think he is the second tallest boy in his class.
④of all在所有的......当中
He is the tallest of all.
Of all the girl in her class, she is the best.
就相当于
She is the best of all girls in her class.
3. 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：① any other + 名词单数
the other + 名词复数
② 否定 + 比较级 = 最高级
比较级 + 极限 = 最高级
1. 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 is ____ season in Beijing
— I think it’s autumn.
A. good B. better C. best D. the best
5. — Which is ____, the sun, the moon or the earth
— The moon is.
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
Fill in the blanks with the correct forms of the words in the box.
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 8,844.43 meters _____. It’s one of the most ________ places for serious mountain climbers.
longest
longer
high
popular
4a
3. No ocean in the world is as _____ as the Pacific Ocean.
4. Although Japan is _______ than Canada, it is _______ smaller.
big
older
much
太平洋
n. 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 the Yangtze River is the longest river in China.
the Yangtze River
the Amazon River
Two cities: ___________ and ___________
1. _______________________________.
2. _______________________________ .
Two animals: ________ and _________
1. _______________________________.
2. _______________________________ .
Two restaurants:_______ and _________
1. _______ ____
2._______ ____
Two supermarket:_______ and_______
1.______ _____
2._______ ____
Write five questions using comparisons. Then ask your partner your questions.
1. _________________________________
2. What is the biggest park in our town 3. _________________________________
4. _________________________________
5. _________________________________
4c
What is the highest building in our city
Summary
1.复习了形容词和副词的三大级别
2.学习了一些重点单词，短语和句型。
3.学习了形容词和副词的比较级和最高级的用法