Unit 3 Computers Grammar 课件(共20张PPT)

(共20张PPT)
英语（牛津版）
八年级 上册
English
Grammar
Computers
Unit 3
Will computers make our lives better
Revision and introduction
The first computers were _________ than cars, but now they are becoming ________ and _________.
Computers can calculate at a _________ speed than we can.
Computers are not _________ than human beings, but they may be able to do a _________ job than us.
In the past, computers were _______ expensive, but now they are much ________.
cheaper
cleverer
faster
smaller
bigger
more
Grammar A The comparative of adjectives
When we compare two people or things, we can use the comparative of adjectives.
better
better
01
When we compare two people or things，we can use the comparative of adjectives .We form the comparative of adjectives like this：
Adjectives Comparative of adjectives
cheap cheaper
tall taller
interesting more interesting
expensive more expensive
A The comparative of adjectives
How do we form the comparative of adjectives
-er
more
than
the comparative of adjectives
比较级形式 例词
单音节形容词 大多数单音节形容词 + -er high → higher
small → smaller
以-e结尾 + -r large → larger
wide → wider
一个元音 + 一个辅音 双写辅音字母，再加-er big → bigger
hot → hotter
双音节形容词 以-y或-ly结尾 去掉y，再加-ier happy → happier
silly → sillier
以非重读元音、/l/或/R(r)/结尾 + -er(-r) clever → cleverer
simple → simpler
以-ful，-less，-ed，-ing结尾 more + 形容词原级 careful → more careful
boring → more boring
多音节形容词 含三个或三个以上音节 more + 形容词原级 difficult → more difficult
popular→ more popular
more expensive
lighter
Complete the conversation below and on page 40 with the comparative of the adjectives from the box.
02
heavier
smaller
bigger
S1: ______________________, Canada or China (country/big)
S2: ______________________________.
Which country is bigger
Canada is bigger than China
Ask and answer questions using the following information. The first one has been done for you.
(country/big)
Canada
China
Hong Kong
Shanghai
the Yellow River
the Yangtze River
Hainan Island
Taiwan Island
Mountain Tai
Yellow Mountain
(city/big)
(river/long)
(island/large)
(mountain/high)
S1: _______________________,Cananda or China (country/big)
S2: _________________________.
Which country is bigger
Canada is bigger than China
Ask and answer questions using the following information. The first one has been done for you.
The red laptop is the smallest among/of the three.
When we compare more than two people or things, we use the superlative of adjectives.
Grammar B The superlative of adjectives
03
We form the superlative of adjectives like this :
Adjectives Superlative of adjectives
high the highest
careful the most careful
interesting the most interesting
How do we form the superlative of adjectives
￥6,000 ￥4,600 ￥7,500
The red laptop is the smallest among/of the three,
but it is ___________________.
the most expensive
-est
most
the
the superlative of adjectives
最高级形式 例词
单音节形容词 大多数单音节形容词 + -est high →highest small →smallest
以-e结尾 + -st large →largest wide →widest
一个元音 + 一个辅音 双写辅音字母，再加-est big →biggest hot → hottest
双音节形容词 以-y或-ly结尾 去掉y，再加-iest happy → happiest silly → silliest
以非重读元音、/l/或/R(r)/结尾 + -est(-st) clever → cleverest simple → simplest
以-ful，-less，-ed，-ing结尾 most + 形容词原级 careful → most careful
boring → most boring
多音节形容词 含三个或三个以上音节 most + 形容词原级 difficult → most difficult
popular → most popular
David: I’d like to see some of your cameras.
Salesman: Certainly. This is the most expensive model.
This is the cheapest model.
This is the newest and lightest model.
a
b
c
B1 David is shopping for a camera. Look at the photos and write the letter of the correct model after each statement.
(1)________
(2)________
(3)________
Tony: Did they show you any cameras
David: Yes. The (1)______________model is
(2)____________________________.
The (3)_______________model costs (4)_____________.
The (5)_______________model was made in (6)_______.
The (7)_________model weighs (8)______________.
expensive light old small
smallest
99.8 mm x 56.4 mm x 24.5 mm
most expensive
oldest
lightest
3,589
2010
170 g
B2 David told his friend Tony about his shopping plete David’s sentences with the superlative of the adjectives from the box.
S1: Which is the biggest, the Earth, the Moon or the Sun
S2: The Sun is the biggest.
the Earth, the Moon or the Sun (big)
a bee, a butterfly or an ant (small)
iron, silver or gold (valuable)
a bear, a whale or an elephant (heavy)
a spaceship, a plane or a train (fast)
Ask and answer questions using the following information. The first one has been done for you.
1. We have learned the usage of the comparative and superlative of adjectives
2. We have understood to sum up some language rules
一、用括号中形容词的适当形式填空。
1. Hainan is a very large Island .It is the second _________ island in china. (large)
2. Our teacher is as ______ as before. (busy).
3. He is ______________ among us. (careful)
4. Li Lei jumped far ______ than Jim. (far)
5. The busier he is, the ________ he feels. (happy)
6. I think Yao Ming is one of ____________ basketball players in NBA. (hot)
busy
the most careful
farther
happier
largest
the hottest
6 I am very ______. But Tom is ___________ than I. Frank is _____________. （tired）
7 Which is _____________ （difficult）, physics or biology
8 This book is ________ than the other two . It is ____________of the three . （easy）
9 In summer it’s _______ （hot） in Wu Han than in Beijing .
10 The Chinese people have a much _______ （good）life now .
tired
more tired
the most tired
more different
easier
the easiest
hotter
better