九年级英语下册Unit 13 We're trying to save the earth Section A(Grammar Focus-4c)课件(共17张PPT)

(共17张PPT)
Section A (Grammar Focus-4c)
UNIT 13
We’re trying to save the earth!
学科素养
1. 语言能力：
（1）能够掌握课时内重要词汇和短语：take part in,afford,turn off,reusable,pay for,take action,transportation 等。（2) 能够运用现在进行时、现在完成时和被动语态等时态的句子描述环境污染、环境保护和循环再利用。
2. 文化意识：
能够用与污染相关的词汇，对环境污染和环境保护进行简单描述。
3. 思维品质：
能运用目标语言谈论污染问题，能在实际情景对话中认识解决空气污染和垃圾污染的方法。
4. 学习能力：
能正确区分和使用以下语法结构：现在进行时、used to、被动语态、现在完成时、情态动词。
立德树人
了解环境污染的原因，树立环保意识，培养社会责任感。
Lead-in
Story time
It was a lovely fresh spring in the meadow.
You found me easily.
What are you looking at
They are dancing through spring flowers.
Little Green Worm has grown.
I haven’t seen one quite like this before.
You must be the best finder.
I might be
Pay attention to the grammar of sentences.
simple past tense一般过去时
present progressive tense 现在进行时
present perfect tense 现在完成时
Modal verbs 情态动词
Grammar Focus
We’re trying to save the earth.
The river used to be so clean.
The air is badly polluted.
No scientific studies have shown that shark fins are good for health.
We should help save the sharks.
We’re trying to save the earth. Modal verbs
The river used to be so clean. Present progressive
The air is badly polluted.
No scientific studies have shown that shark fins are good for health. Passive voice
We should help save the sharks. Present perfect
used to
现在进行时: Present progressive
We’re trying to save the earth.
Now people are taking action to save wild animals.
The air pollution is getting worse and worse.
Look! The factory is putting waste into the water.
meaning
form
use
现在进行时表示（说话瞬间）正在进行或发生的动作，也可表示当前一段时间内的活动或现阶段正在进行的动作。
be （am, is, are）+ v. ing (动词的现在分词)
标志性词汇：now，right now， Look， Listen
现在分词的构成：1.一般情况下在动词词尾加-ing。如：go - going 2.以不发音的e结尾的动词，去掉e加-ing。如：have - having 3.以一个辅音字母结尾的重读闭音节，双写最后一个字母，再加-ing。如：stop - stopping。
现在完成时: Present perfect
No scientific studies have shown that shark fins are good for health.
We have seen many changes in the environment.
He has kept this book for over two months.
We have lived here since my little sister was born.
He has already tried this to solve the problem, but it didn’t work.
meaning
form
use
现在完成时态表示动作已经完成，但对现在造成影响；或者表示从过去某一时间开始一直延续到现在并还可能继续延续下去的动作。
have/has + done (过去分词)
标志性词汇：already，yet，ever，never，just，before，once，twice，recently，so far，for + 时间段, since + 时间点/从句
过去分词的构成规则：1. 一般情况下，在动词后加-ed。 2. 在以-e结尾的动词后只加-d。3. 在以辅音字母加y结尾的动词，应将y改为i再加ed。4. 以重读闭音节结尾的动词，要双写末尾的辅音字母再加-ed。5. 不规则动词的过去分词
过去分词构成规则
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。
在以辅音字母加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 Passive Voice
The air is badly polluted.
The river is polluted by factories.
The video was sent out quickly and was seen by many schoolmates.
In the future, robots will be used by more and more people.
Many more trees should be planted by us.
meaning
form
use
被动语态表示主语是动作的承受者。
主动语态表示主语是动作的执行者。
be + done （过去分词）
一般现在时被动语态：am/is/are + done
一般过去时被动语态：was/were + done
一般将来时被动语态：will be/is going to be +done
情态动词的被动语态：can/could/may/might/should/must + be + done
used to
The river used to be so clean.
James used to wake up late, but now he gets up very early.
Did Cherry use to live in Shanghai when she was a child
meaning
form
use
used to 表示过去常常做某事
否定句：didn’t used to，
一般疑问句: Did + 主语 + used to...
used to do 表示过去常常做某事
be used to doing 表示习惯于做某事
情态动词 Modal verbs
We should help save the sharks.
We should take action to save the earth.
Our actions can make a difference.
What can we do
to help save the earth
meaning
form
use
情态动词通常无人称和数的变化
情态动词有：can/could 能够；may/might可能、可以；need需要；have to 不得不；would 愿意、将要；shall 将（第一人称）; should 应该；must 必须
情态动词后接动词原形
4a
Fill in the blanks with the correct forms of the verbs in brackets.
Joe: _____ you ever ______ (take) part in an environmental project
Eric: 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
Eric: 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.
Eric: Yes, we can’t afford to ____ (wait) any longer to take action!
Have
taken
helped
considered
had
took
think
came
trying
wait
take part in 参加，参与
consider 认为
afford to支付得起
not ...any longer 不再
take action 行动起来
had
4b
Fill in the blanks with the appropriate modal verbs from the box.
can would could have to should must may/might
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. 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 actions now!
may
must
could
could
should
have to
can
can
would
adj. 可重复使用的；可再次使用的
付费；付出代价
4c
Make a list of things that people can do to help the environment and discuss your list with your partner.
use public transportation
A:I think that everyone should use public transportation.
B:I disagree. It’s difficult for parents with young children to use public transportation...
n. 运输业；交通运输
Exercise
一、用所给单词的正确形式填空
1. Alice，please turn down the music，I _______________ an important
phone now.
2．His finger __________ by a machine while working.
3．The number of sharks__________ by over 90 percent in the last 20 to 30
years.
4．About 70 million sharks __________ and traded every year.
5．If the numbers of sharks drop too low，it __________ danger to all ocean
life.
am answering
was cut off
has fallen
are caught
will bring
6．Have you ever__________(take) part in an environmental club
7．The old man can't afford__________(pay) for the new computer at all.
8．The students in this school made the garden a place for________________ (science) experiments.
9．It is difficult for parents with young children to use the
public_____________(transport).
10．The Clean-Up-Day is regarded as the__________(big) project in our
school.
taken
to pay
scientific
transportation
biggest
二、根据汉语意思完成句子，每空一词。
11．当你出去的时候，不要忘记关灯。
Don't forget to _________________ the lights when you go out.
12．你愿意参加校运动会吗？
Would you like to _________________the school sports meeting
13．你买所有这些东西一共花了多少钱？
How much did you _________________all these things
14．我至今没有收到她的回复。
I have had no reply from her _________________．
15．我觉得到我采取行动的时候了。
I felt that it was time for me _________________．
turn off
take part in
pay for
so far
to take action
take part in, afford, turn off, reusable, pay for, take action, transportation
Grammar Focus
Words & phrases
used to
Present progressive
Passive voice
Present perfect
Modal verbs
Summary