资源简介

(共25张PPT)
Section A Grammar (4a~4c)
The Wonders of Nature
Unit 4
Learning aims
能正确使用形容词、副词的比较级和最高级
能正确读写英语中的大数
Lead in
Watch and say
What do you know about these natural wonders of the world
Activity 1
Learn to use Conjunctions: although, until, so that, if
4a
Read the sentences. Circle the adjectives 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.
形容词、副词的比较级和最高级
形容词和副词通常有三种级别：
1. 原级 (Positive Degree): 形容词 / 副词本身的原形，不做任何比较，
只描述人 / 事物原本的特征、状态。
2. 比较级 (Comparative Degree)：在两者之间进行比较，表示“更……”。3. 最高级 (Superlative Degree)：在三者或三者以上中比较, “最……”。
The Yangtze River
长江
6300 km
The Yellow River
黄河
5464 km
The Zhujiang River
珠江
2320 km
The Yellow River is longer than the Zhujiang River.
The Yangtze River is longer than the Yellow River.
The Yangtze River is the longest of all.
比较级与最高级的区别：
比较级：_____者比较。
最高级：_____者或_____者以上比较。
两
三
三
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
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 北京和上海，哪个城市更大？
比较级
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。
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
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？
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.
(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。
Look and Practice
句型转换。
1. He is the tallest boy in his class.（改为同义句）
He is ________ than ________ ________ boy in his class.
2. This is one of the most popular songs.（改为一般疑问句）
________ this one of ________ ________ popular songs
3. The Yangtze River is longer than any other river in China.（改为最高级）
The Yangtze River is ________ ________ river in China.
4. Which is the best, red, blue or green （回答：Green is the best.）
________ is the best ________ the three.
5. He runs faster than the other members.（改为同义句）
He runs ________ than ________ ________ member.
taller
any
other
Is
the
most
the
longest
Green
of
faster
any
other
4c
Complete the passage with the correct forms of the words in the box. One word is used more than once.
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 ________ and louder. 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
Activity 2
Read and write large numbers correctly
Read the sentences. Circle the large numbers.
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.
大数字的英文读法
英语中数字的读法遵循 “三位一组” 的原则，从右往左每三位用逗号隔开，每一组对应一个大单位。
thousand（千）：第 1 组（右数 1-3 位）
million（百万）：第 2 组（右数 4-6 位）
billion（十亿）：第 3 组（右数 7-9 位）
例：9,000,000 读作 nine million
例：11,000 读作 eleven thousand
三位数内部读法
每组三位数（000-999）的读法遵循以下规则：
百位 + and + 十位 / 个位（英式英语），美式英语中 and 常省略。
例：123 → one hundred (and) twenty-three
十位和个位之间用连字符 - 连接。
例：45 → forty-five
例：789 → seven hundred (and) eighty-nine
以 123456789 为例，分组：从右往左三位一组 → 123, 456, 789
读每组：
123 → one hundred (and) twenty-three
456 → four hundred (and) fifty-six
789 → seven hundred (and) eighty-nine
加单位：每组后加上对应的单位：123 million, 456 thousand, 789
整合：one hundred (and) twenty-three million, four hundred (and) fifty-six thousand, seven hundred (and) eighty-nine
零的处理：
组内全为零时，该组及单位省略。
例：9,000,000 → nine million（省略了后面的 000 thousand）
组内有零，按正常数字读出。
例：105 → one hundred (and) five
例：5,020 → five thousand (and) twenty
单位词的单复数：
当 thousand, million, billion 等词前面有具体数字时，永远用单数。
eleven thousand
eleven thousands
表示概数时，用复数 + of。
例：thousands of people（成千上万的人）
Summary
◆比较级与最高级
形容词和副词通常有三种级别：
1. 原级 (Positive Degree): 形容词 / 副词本身的原形，不做任何比较，
只描述人 / 事物原本的特征、状态。
2. 比较级 (Comparative Degree)：在两者之间进行比较，表示“更……”。3. 最高级 (Superlative Degree)：在三者或三者以上中比较, “最……”。
Homework
1. Write some sentences with Comparative Degree or Superlative Degree.
2. Finish the exercises.

展开更多......

收起↑