人教版九年级全Unit 13 We’re trying to save the earth Section A 4a-4c课件(共38张PPT)

(共38张PPT)
Period 3 4a-4c
Grammar focus
Section
A
Unit 13 We’re trying to save the earth.
不同种类的污染
2. 河底
3. 把垃圾扔到河里
4. 在……中起作用
different kinds of pollution
the bottle of the river
throw rubbish into the river
play a part in
I. Check if you know these phrases.
5. 在中国南部
6. 对……有害
7. 在……顶部
8. 海洋生态系统
in southern China
be harmful to
at the top of
the ocean’s ecosystem
II. Translate the sentences.
1. 甚至是河底都满是垃圾。
2. 这个方法不仅残酷还对环境有害。
Even the bottom of the river was full of rubbish.
This method is not only cruel, but also harmful to the environment.
3. 鲨鱼处于海洋食物链的顶部。
4. 许多人相信鱼翅对健康有好处。
Sharks are at the top of the food chain in the ocean’s ecosystem.
A lot of people believe that shark’s fins are good for health.
We are try 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 sharks fins are good for health. Present perfect
We should save the sharks. Model verbs
Grammar Focus
Pay attention to the sentences.
1. We’re trying to save the earth.
2. The river used to be so clean.
3. The air is badly polluted.
4. No scientific studies have shown that shark fins are good for health.
5. We should help save the sharks.
Present progressive
used to
Passive voice
Present perfect
Modal verbs
现在进行时
（1）含义：表示正在发生或进行的动作。
（2）基本结构：
主语 + be + 现在分词（be 的形式随主语的变化而变化）
（3）基本用法：
①表示现在正在进行的动作。特征：常常与now或具体的时间连用，有时句中会有感官动词来提示，或通过上下文来暗示。
②表示现阶段一直进行的动作。这类动词常常是延续性动词。常于at present, this week, these days等连用。
③表示主语的特征、性格、能力等
本单元复习现在进行时、used to句型、被动语态、
现在完成时和情态动词。
What a fine day today!
Look! What are they doing
现在完成时
（1）含义：表示过去发生的动作对现在还有影响。
（2）基本结构：主语 + have / has + 过去分词
（3）基本用法：
①表示过去发生的动作，但强调对现在产生影响。特征：不能与表示具体的时间状语连用。
②表示过去发生的动作或存在的状态一直延续到现在，还可能继续下去。常常与since, for, in the past + 时间名词，in the last +时间名词等时间状语连用，而且谓语动词要求是延续性动词。
③表示一种“经历或体验”，即可以表示经历过也可以是从来都没有经历过。
Complete the following sentences.
1. I _________ (be) in Beijing for two years.
2. I _____ never _____ (hear) of that
man before.
3. Tom __________ (work) there since
two years ago.
have been
have
heard
has worked
4. The twins ___________ (wash) the clothes for an hour.
5. He _________ (play) basketball since three years ago.
6. How long ____ Sally _____ (sing) yet
have washed
has played
has
sung
被动语态
初中阶段我们学习了七种被动结构，归纳如下：
（1）一般现在时是被动语态：am / is / are + 过去分词
（2）现在完成时的被动式：
have / has + been + 过去分词
（3）现在进行时的被动式：
am/ is/ are + being + 过去分词
（4）一般过去时的被动式：was / were + 过去分词
（5）过去进行时的被动式：
was / were + being + 过去分词
（6）过去完成时的被动式：had + been + 过去分词
（7）一般将来时的被动式：
will / be going to be+ 过去分词
（8）含有情态动词的被动式：
情态动词+be +动词的过去分词。
Translate the sentences by using Passive voice.
1. 刚才一些老年人参观了博物馆。
2. 工人们使用不同种类的机器工作。
The museum was visited by some old people just now.
Different kinds of machines are used to work by the workers.
情态动词
情态动词表示说话人对某一动作或状态的态度，如认为“可能”、“应当”、“必要”等。情态动词本身有一定的意义，但不能单独作谓语，也没有人称和数的变化。后面一般跟动词原形。
used to 结构
used to意为“过去常常做某事”，指的是过去的习惯性动作，目的在于与现在形成对照。used to是个情态动词，其中的to是不定式符号，后面跟动词原形。在美式英语中。它的疑问式是：Did ＋主语＋use to do sth．？否定式是：主语＋didn't use．．。在英式英语中，它的疑问式应当是：Used ＋主语＋to sth．？否定式应当是used not to或use（d）n't to。
He used to stay up late. 他过去常熬到很晚。
Translation.
1. 我们不能在教室里吃东西。
2. 首先你必须完成作业。
3. 他现在不可能在家。
4. 她一定知道这个问题的答案。
We can’t eat in the classroom.
You must finish your homework first.
He can’t be at home now.
She must know the answer to this question.
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).
Fill in the blanks with the correct forms of the verbs in brackets.
Have taken
helped
considered
had had
4a
Joe: How many people ______ (take) part
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!
took
think
came
trying
wait
Fill in the blanks with the appropriate modal verbs from the box.
People _____ think that big things _____ be done. However, 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 paper or reusable bags instead of plastic bags.
can could would have to should must may/might
may
should
could
would
4b
Make a list for things that people can do to help the environment and discuss your list with your partner.
A: I think that everyone should use public
transportation.
B: I disagree. it's difficult for parents with
young children to use public
transportation...
use public transportation
...
4c
Discussing...
use public transportation
take your own shopping bags when go shopping
reduce the use of air conditioners in summer
turn off the lights when you leave the room
grow more plants...
4c
A: I think that everyone should take your own
shopping bags when go shopping.
B: I agree. it's good for the environment.
A: I think that everyone should reduce the use of air conditioners in summer.
B: I disagree. the summer is so hot, especially in sourth China. Without air-conditioners, people may not have the patience to work.
A: I think that everyone should turn off the
lights when you leave the room.
B: I agree. it's good to save energy resources.
A: I think that everyone should use public
transportation.
B: I disagree. it's diffcult for parents with
young children to use public transportation.
A: I think that everyone should grow more
plants.
B: I agree. growing more plants will provide
us more fresh air and make our plant
more beautiful.
选择填空：
1.-- ____ you pass me a pen I'd like to write down
the phone number.
-- Sure. Here it is.
A. Can B. Need C. Might D. Must
2. -- May I go to the cinema, Mum
-- Certainly, but you ___ be back by 11 o'clock.
A. can B. may C. must D. need
3. you ___ worry about me. It's nothing serious.
A. can't B. mustn't C. needn't D. won't
4. -- Excuse me. Is this the right way to the
Summer Palace
-- Sorry, I'm not sure. but it ____ be.
A. might B. mustn't
C. can't D. must
5. The man in the office ____ be Mr. Black,
because he went home just now.
A. mustn't B. may not
C. can't D. needn't
6. He promised to pick me up at the school gate. However, he _____ yet.
A. didn’t arrive B. doesn’t arrive
C. isn’t arriving D. hasn’t arrived
7. Ba Jin, one of the greatest writers in China, ___ as “People’s Writer”.
A. is regarded B. has regarded
C. is regarding D. regards
8. —Where is Tom
—He ______ in his room.
A. is reading B. reads
C. read D. was reading
9. —May I go out now, Dad
— No. You _____ let your mother know first.
A. can B. may C. need D. must
10. Her son _______ Coke, but now he
________ milk.
A. used to drink ; is used to drinking
B. used to drinking ; drinks
C. is used to drinking ; used to drink
D. is used to drink ; is drinking
11. (2013江苏淮安) It's getting dark. Please __ the light.
A. turn on B. turn off
C. turn down D. turn around
12. (2013湖北随州)–How does Jack usually go to work
—He ______ drive a car, but now he ______ there to
lose weight.
A. used to; is used to walk
B. was used to; is used to walking
C. was used to; is used to walk
D. used to; is used to walking
13. In the last ten month, September Miracle
( 奇迹) ____on CCTV for more than five times
and is popular all over the country.
A. has played the piano
B. has given out their song disks
C. has written songs
D. has performed
14. (2013广东) Not only my friends but also I _______ interested in football and Messi is
our favorite star.
A. be B. am C. is D. are
15. (2013湖北宜昌)—At present, one of the best
ways to study is working in groups.
—More chances _______ to students to
learn from each other.
A. offer B. are offered
C. have offered D. are offering
用所给词的适当形式填空。
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
Write an article to show in what way
we students can protect the environment.