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(共43张PPT)
Unit 13 We’re trying to save the earth!
Section A (3a-4c)
Words & Expressions
shark
fin
cruel harmful
be harmful to at the top of
n. 鲨鱼
n. （鱼）鳍
adj. 残酷的；残忍的
adj. 有害的
对……有害
在……顶部或顶端
Words & Expressions
chain
the food chain ecosystem
industry
law
scientific
n. 链子；链条
食物链
n. 生态系统
n. 工业；行业
n. 法律；法规
adj. 科学上的；科学的
Words & Expressions
take part in afford
turn off
reusable
pay for
take action
transportation
参加
v. 承担得起(后果)；买得起
关掉
adj. 可重复使用的；可再次使用的
付费；付出代价
采取行动
n. 运输业；交通运输
Key Sentences
1. But do you realize that you are killing a whole shark each time you enjoy a bowl of shark fin soup
2. But in fact, around 70 million sharks are caught and traded in this industry every year.
3. Have you ever taken part in an environmental project
1. Have you ever seen a shark（鲨鱼）
2. What do you know about sharks
Discuss with your partner:
There are some endangered animals .
We should do something to protect the animals and the environment!
Save the earth! Save the animals.
3a
Read the passage about sharks.
Save the Sharks!
Many have heard of shark fin soup. This famous and expensive dish is especially popular in southern China. But do you realize that you’re killing a whole shark each time you enjoy a bowl of shark fin soup
听说，
相当于hear about
When people catch sharks, they cut off their fins and throw
the sharks back into the ocean. This is not only cruel, but
also harmful to the environment. Without a fin, a shark can
no longer swim and slowly dies. Sharks are at the top of the
food chain in the ocean’s ecosystem. If their numbers drop too
low, it will bring danger to all ocean life. Many believe
that sharks can never be endangered because they are the
切掉；切断
adj.残酷的；残忍的
adj. 有害的
be harmful to对……有害
不再
在……顶部或顶端
n.生态系统
strongest in their food chain. But in fact, around 70 million sharks are caught and traded in this industry every year. The numbers of some kinds of sharks have fallen by over 90 percent in the last 20 to 30 years.
n.工业；行业
在过去的20到30年里，
是现在完成时的标志性时间状语之一
Environmental protection groups around the world, such as WildAid and the WWF, are teaching the public about “finning”. They have even asked governments to develop
laws to stop the sale of shark fins. So far, no scientific
studies have shown that shark fins are good for health, so why eat them Help save the sharks!
n.法律；法规
adj.科学上的；科学的
到目前为止；迄今为止
是现在完成时的标志性时间状语之一
Read the passage in 3a quickly and answer the questions.
Sharks are at the top of the food chain in the ocean’s ecosystem.
Yes, I think sharks are endangered. Because when people catch sharks, they cut off their fins and throw the sharks back into the ocean. Without a fin, a shark can no longer swim and slowly dies.
Do you think sharks are endangered Why
What do you know about sharks
People catch sharks and cut off their fins and throw them back into the ocean. Without a fin, a shark dies.
What do you think might have caused a fall in the number of sharks
3a
Read the passage about sharks and complete
the fact sheet below.
Where shark fin soup is popular
Number of sharks caught and traded every year
How governments can help
Two environmental groups against “finning”
In southern China.
Around 70 million.
To develop laws to stop the sale of shark fins.
WildAid and the WWF.
3b
Read the passage again and fill in the blanks
with the words in the box.
1. Many people do not realize they are killing a whole shark ______they enjoy a bowl of shark fin soup.
2. Sharks are at the top of the food chain, ________ if their numbers drop, the ocean’s ecosystem will be in danger.
3. Many think that sharks are too strong to be endangered, _______ they are wrong.
when
so
but
so although if but when
4. ________ there are no scientific studies to support this, a lot of people believe that shark fins are good for health.
5. Sharks may disappear one day _______ we do not do something to stop the sale of shark fins.
Although
if
Grammar Focus
We’re trying to save the earth. Present progressive
The river used to be so clean. used to
The air is badly polluted. Passive voice
No scientific studies have shown that shark fins are good for health. Present perfect
We should help save the sharks. Modal verbs
Grammar
现在进行时
现在进行时
基本
结构
基本
用法
标志词
be (am/is/are) + 动词-ing
1.表示现在正在进行或发生的动作。
2.表示现阶段或当前一段时间之内
正在进行的动作。
now、look、listen、these days等
a.一般情况下，在动词词尾后加-ing。
如：go → going。
b.以不发音的e结尾的动词，去掉e加-ing。
如：have → having。
c.以重读闭音节结尾的动词，末尾只有一个辅音字母，双写这个辅音字母，再加-ing。
如：run → running。
动词-ing形式的构成
现在完成时
现在完成时
基本
结构
基本
用法
标志词
have/has + 过去分词
1. 表示过去发生或已经完成的动作对现在造成的影响或结果。
2. 从过去某一时间开始并一直持续到现在且还有可能持续下去的动作。
already、yet、ever、never、for +时间段、since +时间点、so far、in the last/past...years等
过去分词的构成
一般情况下，在动词后加-ed。如: work → worked。
在以e结尾的动词后只加-d。如: close → closed。
以辅音字母加y结尾的动词，应将y改为i再加-ed。如: study → studied。
以重读闭音节结尾的动词，要双写末尾的辅音字母再加-ed。如: stop → stopped。
不规则动词的过去分词:
AAA型 put put put
AAB型 beat beat beaten
ABA型 become became become
ABB型 get got got/gotten
ABC型 begin began begun
被动语态
主动语态表示主语是动作的执行者。被动语态表示主语是动作的承受者，即行为动作的对象。
I cleaned my room. → My room was cleaned by me.
I saw him cross the road and enter the shop. → He was seen to cross the road and enter the shop.
在含有使役动词 (如：make) 或感官动词 (see、watch、notice、hear等) 的主动语态的句子中，这些词后常跟省略to的动词不定式，但是改为被动语态时则要把省去的to还原。
被动语态的构成
被动语态的基本结构：助动词be + 及物动词的过去分词
一般现在时的被动语态：am/is/are + 过去分词
一般过去时的被动语态：was/were + 过去分词
一般将来时的被动语态：will be/is going to be + 过去分词
含情态动词的被动语态：情态动词 + be + 过去分词
1. 情态动词一般没有人称和数的变化。
2. 情态动词后接动词原形。
3. 常用的情态动词有：can/could、may/might、must/have to、should/ought to、would、need等。
情态动词
used to
used to意为“过去常常做某事”，后接动词原形。
used to句型的否定句形式：didn’t use to...
used to句型的一般疑问句形式：Did + 主语 + use to...
used to do表示过去常常做某事，而现在往往不做了；
be used to doing表示习惯于做某事。
4a
Fill in the blanks with the correct forms of the
verbs in brackets.
Joe: ______ you ever ________ (take) part in an
environmental project
Ken: Yes, I have. I _______ (help) with a Clean-Up Day
last year. It was __________ (consider) the biggest
clean-up project this city______ ever ________ (have).
Joe: How many people ________ (take) part
Have
taken
helped
considered
had
had
took
Ken: I ___________ (think) more than 1,000 people
______(come) to help out.
Joe: That’s fantastic! I guess everyone in this city is
______ (try) to improve the environment.
Ken: Yes, we can’t afford to________ (wait) any longer
to take action!
think
came
trying
wait
4b
Fill in the blanks with the appropriate modal
verbs from the box.
People _________ think that big things__________________ be done to save the earth. Many forget that saving the earth begins with small things. For example, you ______________ save electricity by turning off the lights when you leave a room. You _______________ also use reusable bags instead of plastic bags.
can
would
could
have to
should
must
may/
might
may/might
should/have to/must
can/could/should
can/could/should
adj. 可重复使用的；可再次使用的
关掉
I think it’s a great idea that you now _______ pay for
plastic bags in some stores. And instead of driving to school or work, you _______________ ride your bike or walk. If it’s far, you __________ take the bus. All these small things __________ add up and become big things that ______________ improve the environment. Let’s take action now!
have to
can/could/should
can/could
can/could
would/can/could
付费；付出代价
采取行动
4c
Make a list of things that people can do to help the
environment and discuss your list with your partner.
I think that everyone should use public transportation.
I disagree. It’s difficult for parents with young children to use public transportation...
use public transportation
n. 运输业；交通运输
Language points
1. The numbers of some kinds of sharks have fallen by over 90 percent in the last 20 to 30 years.
“the numbers of... ”是“the number of…”的复数形式。
The numbers of different kinds of flowers are growing quickly.
【易混辨析】the number of...与a number of...
例词 词义 用法
the number of... ……的数量 “the number of+可数名词复数”作主语时，谓语动词用单数形式。
a number of... 一些；若干 “a number of+可数名词复数”作主语时，谓语动词用复数形式。
A number of measures have been taken to protect wild animals because the number of them has become smaller and smaller.
2. The numbers of some kinds of sharks have fallen by over 90 percent in the last 20 to 30 years.
Last year, the price of this kind of car was 100, 000 yuan. This year it falls to 80, 000 yuan. It falls by 20 percent.
“fall by” 意为“下降了”，by表示变化的幅度。fall to意为“下降到”。
3. Have you ever taken part in an environmental project
take part in 参加
take part in多指参加会议或集体性的工作或活动，且参加者在其中发挥一定的作用。
Li Lanjuan headed for Wuhan and took an active part in the battle.
4. Yes, we can’t afford to wait any longer to take action!
afford / f (r)d / v. 承担得起（后果）；买得起
afford作动词，常用在can、could、be able to等之后。afford sth.“买得起某物”；afford to do sth.“负担得起做某事”。
I can’t afford the new TV.
I hope I can afford to buy a big house one day.
Exercise
一、单项选择
1.— Why not ask Bob to join us in the trip to the zoo tomorrow
— Everyone in our group loves animals, but he always seems______.
anxious B. personal C. cruel D. careless
2. A number of visitors _______ visiting the West Lake and the number of the visitors _____ increasing.
are; is B. is; are C. are; are
C
A
3. Don’t play games on the computer all day. It’s _______ to your eyes.
A. harmful B. thankful
C. useful D. helpful
A
4.The documentary A Plastic Ocean is so impressive that I ________ it several times so far.
watched B. watch
C. have watched D. will watch
C
5. Listen! Our science teacher ________ the use of the robot.
A. explains B. explained
C. is explaining D. has explained
6. “I’m still working because I’m still capable and hope to guide more young people,” said Wu Mengchao when he _______.
A. is interviewed B. is interviewing
C. was interviewed D. was interviewing
C
C
7.— Our computer is working again!
— Yes. Our IT teacher ________ it. It took him about an hour.
A. has fixed B. will fix C. is fixing D. was fixing
8.— Must I wash my clothes at once, Mom
— No, you ________. You ________ wash them before 5:00 p.m.
A. needn’t; may B. mustn’t; may
C. needn’t; need D. mustn’t; must
A
A
二、用括号内所给单词的适当形式填空
1. The old man used _____ (be) a teacher.
2. We should _____ (clean) the room every day.
3. Look! Tom _____________ (sleep) in his room.
4. Lots of trees _______________(plant) on the hill every year.
5. He _________ (live) here for 20 years.
to be
clean
is sleeping
are planted
has lived
Homework
Recite the key words, phrases and sentences in Section A .
Do the exercises in students’ book.
Thank you!

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