(共38张PPT)
Unit 4 Inventions
Period 3 Grammar
牛津深圳·广州版八年级上册
Learning objectives
1.Knowledge objectives:
①Learn the comparative and superlative forms, usages of some irregular adjectives "bad/bad", "good/good", "more/more", "less" and "far".
②Learn and summarize the structure and usage of as.
③Guide students to actively explore and learn, and understand the cultural content related to this lesson.
2.Skill objectives:
①Be able to analyze and judge the chart information of the textbook, and skillfully use the comparative and superlative adjectives to compare things.
Learning objectives
②Cultivate students' ability to summarize grammar rules.
3.Emotional objectives:
Cooperate with classmates to discuss topics and cultivate students' sense of cooperation.
4.Thinking capacity ：
Cultivate students' level of inquiry learning, autonomous learning, analysis and induction, and cooperative learning.
Revision
根据句意及中文提示完成单词
1. The desk is _______(布满灰尘的). He hasn't cleaned it for a few days.
2. The invention is really _________(有用的)in our daily life.
3. We saw two _________ (四轮马车) in the City Museum.
4. Can you ___________(介绍)me to the manager in your company
5. India is a ___________(发展中的)country.
dusty
practical
carriages
introduce
developing
Discussion
1.Which invention do you think is the greatest invention Why (表示比较三个中最伟大的最伟大的一个发明 )
2.They help people live a better life. (表示过上比之前更好的生活)
3.The wheel is perhaps the greatest invention in history. (表示历史上最伟大的发明)
4.After its invention, travelling became faster and more comfortable.(表示比之前更快更舒适)
Look and say!
Look at the red words in the following sentences. What do they mean What are the common characteristics
红色字的单词是形容词。当我们需要对事物作出比较时，需要用到比较级和最高级。
Lead in
Do you know the comparative forms of adjectives
Grammar
当我们需要对事物作出比较时，需要用到比较级。
比较级的句子结构通常是:
什么+动词be (am, is, are)+形容词比较级+ than (比) +什么,如:
I'm taller and heavier than you. (我比你更高和更重。)
An elephant is bigger than a tiger. (一只大象比一只老虎更大。)
一.比较级的句子结构
注意:比较的两者应该是互相对应的可比较的东西。
典型错误: My hair is longer than you. (我的头发比你更长。)
比较的两者是我的头发、你(整个人)，那么比较的对象就没有可比性。
应该改为: My hair is longer than yours.或My hair is longer than your hair.
变化规则 原级 比较级 最高级
单音节词在词尾加-er (比较级)或-est(最高级)。 bright (明亮的) broad (广 阔的) cheap (便宜的)
以重读闭音节结尾的词末尾只有一个辅音字母应双写辅音字母再加-er或-est。 big (大的) fat (胖的) hot (热的)
二.形容词比较级和最高级的变化规则
Let’s learn
brighter
brightest
broader
broadest
cheaper
cheapest
bigger
biggest
fatter
fattest
hotter
hottest
变化规则 原级 比较级 最高级
以字母e接尾的词加-r或-st。 able (能干的) brave (勇敢的) close (接近的)
以辅音字母+y结尾的词变y为i再加-er,或-est。 busy (忙碌的) dirty (脏的) dry (干燥的)
多音节词和多数双音节词在其前面加more和most。 afraid(害怕的) beautiful (美丽的) careful (仔细的)
Let’s learn
abler
ablest
braver
bravest
closer
closest
busier
busiest
dirtier
dirtiest
drier
driest
most careful
more afraid
most afraid
more beautiful
most beautiful
more careful
二.形容词比较级和最高级的变化规则
Let’s do
old__________ ___________ busy ___________ _____________
thin _________ ____________ many _________ ______________
slow _________ ____________ delicious ______________ ____________
long__________ ____________ wide _____________ ___________
fat ___________ ____________ heavy____________ ____________
older
oldest
busier
busiest
thinner
thinnest
more
most
slower
slowest
more delicious
most delicious
longer
longest
wider
widest
fatter
fattest
heavier
heaviest
写出下列词的比较级和最高级
原级 比较级 最高级
good/well
bad/badly
many/ much
little
far
better
best
worse
worst
less
more
most
farther较远/further进一步
least
farthest最远/furthest最大程度
Let’s learn
A good, bad and far
The comparative and superlative forms of some adjectives are irregular:
A1 Look at the school report below. In pairs, ask and answer
questions about it.
Daisy got an 83 in Art.
Daisy's mark in Art.
Let’s do
Alice got the best mark in Art.
Alice's mark in Art.
1. S1: Who _________________in Art, Belinda or
Daisy (good)
S2: ______________________________________
___________________________________________.
2. S1: Who _______________ in Art (good)
S2: _____________________________.
got a better mark
Daisy got a better mark in Art than
Belinda.
got a best mark
Alice got the best mark in Art
Let’s do
3. S1: Who _________________ in Science, Paul or
Martin (good)
S2: _________________________________________.
4. S1: Who ________________ in Science, Eric
or Alice (bad)
S2: _________________________________________.
5. S1: Who _________________ in Science (bad)
S2: _______________________________.
Paul got a better mark in Science than Martin
got a worse mark
Eric got a worse mark in Science than Alice
got the worst mark
Eric got the worst mark in Science
got a better mark
Let’s do
Let’s do
A2 Look at the map. Ask and answer questions about it. Follow the example.
S1: Whose home is farther/further from Alice’s, Daisy’s or Paul’s
S2: Paul’s home is farther/further from Alice’s.
S1: Whose home is the farthest/furthest from Alice’s, Daisy’s, Paul’s or Eric’s
S2: Eric’s home is the furthest from Alice’s.
Let’s do
Discussion
Group discussion. Do you think seeing is believing
Have you noticed these interesting phenomena in life
Have you ever had this kind of experience It looks very shallow and clear, but it's very deep after going down!
Discussion
Why does the pencil seem to break when it reaches into the water
Which circle is bigger
green circle
purple circle
句型总结:The green circle is as big as the purple circle !
Discussion
Which rectangle below is smaller
A
B
句型总结:Actually, rectangle B is as small as rectangle A!
Did you guess correctly
Discussion
Compare the following two lines. Which one do you think is longer
Line A
Line B
句型总结:Line A is as long as Line B !
Discussion
Line A is not as long as Line B !
Line A
Line B
Line A is shorter than Line B !
= Line A is not so long as Line B !
句型总结：表达A 和B 一样...... _____________________
表达A 不如B ....... _____________________
as + adj.原形 + as
not as/so + adj.原形 + as
Let’s learn
After looking at the previous example, which one do you think is shorter, line A or line B
Who has more apples
The man has as many apples as the woman.
句型总结：as + many + ____________+as
c.n.(plural)
Let’s learn
Which one has more water
A
B
A has as much water as B.
句型总结：as + much + _______+as
u.c.n.
Let’s learn
Let's learn
The first computer was as big as a room.
With light bulbs, people can do as many things in the evenings as they can
in the daytime.
A candle does not produce as much light as a light bulb.
B (not)as...as
We use (not) as ... as to say that things or people are (not) equal in some way.
Let's learn
. We use (not) as ... as with (the base form/the comparative) of adjectives to compare things and people.
. We use (not) as... as with______________+ the plural form of a countable noun or ___________ + an uncountable noun to compare amounts.
Work out the rule
the base form
many, much
B1 Look at the pictures below and complete the following
sentences.
Let’s do
3. The Hotwave ____________ (high) the Micro-King.
4. The Micro-King _______________ (deep) the Speedcook.
5. The Hotwave and the Micro-King ________________ (wide) the
Speedcook and the Superoven.
is as high as
is not as deep as
is not as wide as
Let’s do
B2 Look at the table and the pictures and complete the sentences with (not) as many / much as.
1. The Blacks __________________ cans ___ the Browns.
2. The Whites __________________ plastic ___ the Browns.
3. The Browns __________________ paper ___ the Blacks.
4. The Greens ______________________ glass ___ the Whites.
5. The Greens ______________________ cans ____ the Whites.
as
as
as
as
as
throw away as many
throw away as much
throw away as much
don't throw away as much
don't throw away as many
Let’s do
Summary
形容词比较级和最高级的变化规则
变化规则
1.单音节词在词尾加-er(比较级)或-est(最高级) 。
bright (明亮的)→brighter→brightest
2.以重读闭音节结尾的词末尾只有一个辅音字母应双写辅音字母再加-er或-est。
big (大的)→bigger→biggest
3.以字母e接尾的词加-r或st。
able (能干的)→abler→ablest
4.以辅音字母+y结尾的词变y为i再加er,或est。
busy (忙碌的)→busier→busiest
5.多音节词和多数双音节词在其前面加more和most。
afraid(害怕的)→more afraid→most afraid
A 不如B ... not as/so + adj.原形 + as
as + many + c.n.(plural) +as
as + much + u.c.n.+as
Summary
句型：A 和B 一样... as + adj.原形 + as
Language point
The Blacks throw away as many cans as the Browns.布莱克一家扔的罐子和布朗一家扔的一样多。
(1) the +姓氏复数 the Blacks布莱克一家;布莱克夫妇
还可以表示为the Black family。 “the +姓氏复数”或“the +姓氏+ family”表示“某某一家”或“某某夫妇”，作主语时，谓语动词用复数形式。
The Smiths like red cars. = The Smith family like red cars.
史密斯一家/史密斯夫妇喜欢红色汽车。
Here is a letter from _________(怀特夫妇), who want to come to London.
the Whites
1. The black mobile phone is as _________ (expensive) as the white one.
2. He spent ______(much) money than me during the trip to Ningxia.
3. Miss He has _____ (little) experience, but she is _______(good) teacher in the school.
4. The weather today is much ______(bad) than yesterday.
5. I think this story is much _______________(interest) than that one.
expensive
more
little
the best
worse
more interesting
一、用所给单词的适当形式填空
Exercise
Exercise
1. Mike's English is very good, and his French ________ his English.
A. is as good as B. isn't as good as C. is as well as
2. My brother is ________ I am.
A. as tall as B. as taller than C. much taller as
3. You are doing great! I've never had ________ answer before.
A. better B. best C. a better
二、选择填空
√
√
√
4. You should practise more to improve your English, then you'll
be ________ at it.
A. good B. better C. best
5. The sick boy is getting ________ day by day.
A. worse B. bad C. badly
Exercise
√
√
Homework
1.复习本节课语法内容。
2.使用(not) as ... as 句型造句，至少五个。
谢谢
21世纪教育网（www.21cnjy.com)
中小学教育资源网站
兼职招聘：
https://www.21cnjy.com/recruitment/home/admin
