资源简介

(共34张PPT)
Unit 4　
The Wonders of Nature
第三课时　Section A
(Grammar Focus 4a—4d)
人教版 八年级 英语（下）
Lead in
Let’s enjoy some natural wonders of the world.
Read the sentences. Circle the adjectives which compare things. Underline the adverbs which compare actions.
4a
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 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.
形容词和副词的比较级和最高级
比较级(用于两者之间的比较)
①形容词比较级＋than...
The more careful you are, the fewer mistakes you will make.
你越仔细，犯的错误就越少。
He is taller than me. 他比我高。
②the+比较级, the +比较级 越……，就越……
形容词和副词的比较级和最高级
比较级(用于两者之间的比较)
③比较级+and+比较级
more and more+原级
越来越……
Our hometown is becoming more and more beautiful.
我们的家乡变得越来越美丽。
The weather is getting colder and colder.
天气越来越冷了。
最高级(用于三者或三者以上的比较)：
①the+形容词的最高级＋of/in...
He is the funniest in his class.
他是他们班最有趣的。
He is the tallest of the three.
他是这三个人中最高的。
形容词和副词的比较级和最高级
Pingyao Ancient City is one of the best-kept ancient cities in China.
平遥古城是中国保存最完好的古城之一。
②one of the+形容词最高级+可数名词复数
＋of/in... ……中最……的……之一
Who sings the best in your class, Lily,Tom or Jack
你们班谁唱的最好，莉莉、汤姆还是杰克？
③Which/Who ...+(the) +最高级, A, B or C
形容词、副词比较级和最高级的变化：
clever－cleverer－cleverest
few－fewer－fewest
small－smaller－smallest
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
nice－nicer－nicest
cute－cuter－cutest
large－larger－largest
②以e结尾的词，比较级＋r，最高级＋st
easy－easier－easiest
happy－happier－happiest
③以“辅音字母＋y”结尾的变y为i＋er或est
beautiful－more beautiful－the most beautiful
careful－more careful－the most careful
useful－more useful－the most useful
④多音节和部分双音节词需要在形容词原级前＋more构成比较级，＋the most构成最高级。
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)
比较级和最高级的构成
比较级+than
the+比较级，the+比较级
比较级的用法
规则变化、不规则变化
形容词和副词的比较级与最高级
比较级+and+比较级
more and more+形容词/副词原级
语法知识导图
最高级的用法
形容词和副词的比较级与最高级
(the+)最高级+in/of/among短语
one of the+形容词最高级+可数名词复数+in/of 短语
“Which/Who…(+the)+最高级，A, B or C ”
语法知识导图
用法 意义
原级 as +原级+as 表示“……和……一样”
Lucy is as thin as Lily. notas/so+原级+as 表示“……不如……”
Jerry is not as/so tall as Tom. 比较级二者之间 比较级+ than 表示“……比……更……”
I’m older than her. 比较级+and +比较级 表示“越来越……”
The weather is hotter and hotter. the +比较级,the + 比较级 表示“越……，越……”
The more, the better. 用法 意义
最高级三者及以上 the +最高级（+名词）+ of/in 表示某一范围内“最……的”
Alice is the tallest girl in her class. one of the +最高级+复数名词+of/in 表示某一范围内“最……的……之一”
China is one of the biggest countries in the world. the + 序数词 + 最高级（+名词）+of/in 表示某一范围内“第几……的”
The Yellow River is the second longest river in China. 1．—Did you watch the 2025 Swimming World Cup
—Amazing! I’ve never seen ________ match.
A．the most exciting
B．a more exciting
C．a more excited
D．the most excited
B
Exercise
2．—What should I do, doctor
—You must eat ________ and do ________ exercise.
A．less; more
B．more; less
C．much; little
D．fewer; more
A
3．________ you do your homework, ________ mistakes you will make.
A．The more careful; the less
B．The more carefully; the less
C．The more careful; the fewer
D．The more carefully; the fewer
D
4．—Does Henry work as ________ as Nelly
—No, Nelly is much ________ than anyone else in her class.
A．hardly; harder
B．hardly; more hard-working
C．hard; hard-working
D．hard; more hard-working11
D
5．Chinese is one of ________ used languages in the world.
A．widely
B．more widely
C．the most widely
D．wider
C
较大数字的表达与读法
大于一千的基数词的表达法
1. 从数字的右端向左数，每三位数加一个逗号。
2. 从右向左，第一个逗号处读thousand(千)，第二个逗号处读million(百万)，第三个逗号处读billion(十亿)。
3. 读的时候通常在hundred后加and，如果百位数为0，
则在thousand后加and。
4.英语中没有直接表示“万”和“亿”的单位词，而要用thousand 和million来表达，如“一万”用“ten thousand”、“一亿”用“one hundred million”。
2,674→two thousand six hundred and seventy-four
164,213,430→ one hundred and sixty-four million, two hundred and thirteen thousand, four hundred and thirty
18,357,089→ eighteen million, three hundred and fifty-seven thousand, and eighty-nine
5,204,000,000→five billion two hundred and four million
1．The population of China is about 1,411,750,000. That is ________.
A．one billion, four hundred and eleven million, seven hundred and fifty thousand
B．one billion, and four hundred eleven, seven hundred and fifty thousand
C．one billion, four hundred and eleven million, and seven hundred fifty thousand
A
2．Mount Qomolang ma, with the highest peak in the world, is about ________.
A．eight thousands eight hundreds and forty-eight metres
B．eight thousands and eight hundreds and forty-eight metres
C．eight thousand and eight hundred and forty-eight metres
D．eight thousand eight hundred and forty-eight metres
D
3．How do you read the big number 6325047
A．six million, three hundred and twenty-five thousand and forty seven
B．six million, three hundred and twenty-five thousand and forty-seven
C．six thousand, three hundred and twenty-five million and forty-seven
D．six thousand, three hundred and twenty-five million and forty seven
B
Write or spell out the numbers.
4b
1.Mount Kilimanjaro is________ (five thousand, eight hundred and ninety-five) metres high.
2.__________ (twenty-five thousand, seven hundred and sixty-eight) cubic metres of water pours down Inga Falls each second.
5, 895
25, 768
3.The East African Rift Valley is about 4,000 (______________) miles long.
4.The Taklimakan Desert has a total area of about 337,000 (____________________________________) square kilometres.
three hundred and thirty-seven thousand
four thousand
总面积为……
4c
Complete the passage with the correct forms of the words in the box.
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.
largest
As we went_________ to the falls, the noise of the water slowly grew louder and_________. 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!
large amazing far close loud
most amazing
closer
louder
far
极目所尽
4d
Write some questions to compare places. Then ask a partner your questions.
What is the highest...
Which park is bigger, ... or ...
Language points
It went on for as far as the eye could see. 它一眼望不到头。
as far as... 远至 (某处)
There was a fire in the mountain, which came up as far as our village.
山里发生了火灾，都蔓延到我们村了。
【拓展】
As far as we/I know 据我/我们所知
As far as we know, the Sahara is the biggest desert in the world. 据我们所知，撒哈拉沙漠是世界上最大的沙漠。
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.　

展开更多......

收起↑