》初中英语》牛津深圳版》七年级下册》Chapter 5 Electricity(广东省深圳市)

课件89张PPT。Chapter 5
ELECTRICITYContentsLanguageListeningWritingPhrases & paraphraseReadingSpeakingBrain StormWhat is energy?
How do you feel if you do not have any energy?
What can you do to increase your energy?
How can we supply machines with energy?
Can we change electricity into energy? What kinds?
The power that makes things work.What is energy?How do you feel if you do not have any energy?Tired or sleepyWhat can you do to increase your energy? Rest, sleep, eat healthy food and exercise regularly.How can we supply machines with energy? Plug them into an electricity source; use batteries or solar panels.We cannot see electricity, but we can change it into energy. It usually can change into four kinds of energy:electricityheat energy
movement energy
light energy
sound energy18765432Match the kinds of energy in the box with the things in the pictures.
1.________________ 2.________________ 3.________________ 4.________________ __________________ 5.________________ 6.________________ 7.________________ __________________ 8.________________sound energysound energyheat energylight energy and sound energylight energymovement energymovement energy and sound energyheat energyA Servant of MankindThe servant is ironing the clothes.Some forms of electricity in our daily lifelight bulbbatteryvacuumwater heaterBush’s grin.Bush scratched his head.Ask the students to divide the passage into several parts. The teacher can ask the students to do it before the class.Part 1: Benny wanted to trick Daisy to buy electricity in packets like sweets. (p1-3)
Part2: Benny and his Dad discussed what is electricity.(p4-9)
Part3: Daisy returned with some batteries. Benny was surprised, and now it is Benny looked foolish. (p10-14)Scan part 1 and answer the questions bellow:What is the girl going to buy?
Does Benny often try to trick Daisy?
How does the boy trick Daisy?Sweets (and batteries).Yes. He said, ‘ I was able to trick Daisy at last.’He asks Daisy to buy a packet of electricity. What is electricity?
Can we see electricity?
How does electricity come into our flat?
What are the cables connected to?Scan part 2 and answer the questions bellow:It flows through a wire. It’s like water, in a way.No. We can’t see electricity, but we can change it into different forms of energy. Then we can see, hear or feel it. They are connected to a power station. We make electricity there. Electricity comes into our flat through thin wires, and these wires are connected to cables under the street.Does Daisy take back electricity for Benny? What is it?
Why does Daisy take that thing back?
Who looks foolish at last? Scan part 3 and answer the questions bellow:Yes. She takes back some batteries.Because batteries contain electricity. The chemicals inside produce electricity.BennyRead the article again carefully. And find the facts. (teacher can ask the students to read by following the tape.)1. I’m going to buy some sweets.
2. Can you get me a packet of electricity, please?
3. It’s like water, in a way.
4. …, but we can change it into different forms of energy.
5. They are connected to a power station.
6. They contain electricity. The chemicals inside produce electricity.DaisyBennyelectricityelectricitycablesbatteriesRead and thinkHow does electricity get to Benny’s flat? Choose the correct words in the box to label the diagram below.
(suggestion: teacher can ask the students to do it in pairs and make a dialogue by themselves.)bulb power station wirecable streetwirecablestreetpower station electricity n. 电 electrician n. 电工
There is a problem with the electricity in
Tom’s flat .
An electrician has come to deal with it .
electric a.带电的
electric storm
electric shock
electrical a. 与电有关的
electrical apparatus 电器
electrical engineer Important Points
be able to do sth = can
I am able to speak English.
I can speak English.

look foolish 看起来愚蠢
look +adj. 看起来……, 看上去……
Although he is 70 years old, he
looks very healthy. at last = in the end =finally
I finished my work at last .
I finished my work in the end .
I finished my work finally . in a way 在某种程度上, 稍稍
In a way , I agree with him .
Some of his ideas are right.
by the way
By the way , can you tell me when we will leave ?
in the way
The table is in the way .Please move it .
on the way
On the way to school , I saw Ken .
in this way
I have collected many stamps in this way . look like =be like
1. He looks like his father .
= He is like his father .
2. ---- What’s his like ?
---- He is short and fat .
3. It looks like rain. change v.
We can’t see electricity , but we can change it into energy .
Great changes have taken place in Shenzhen since 1980.
changeable a.
The weather is changeable on top of the
mountain .
change n. 找头；(找回的)零钱
Here is your change. be connected to
1. The wires in our flat are connected to cables buried under the street .
2. Hong Kong and Shenzhen are connected by Luohu Bridge .
connect v. --- connection n.
1. （常与to, with连用）连接；结合；连结
Will you connect this wire to the television?
2 . 接通电话
Connect me with Beijing University.
Review the article and Fill in the blanks.One evening, Daisy wanted to go out to buy ___________. At the same time, Benny asked her to bring him ________________. Benny thought he ___________ trick Daisy. Because no one could buy ________ in packets. Daisy would ____________.some sweetsa packet of electricitywas able toelectricitylook foolishWhat is electricity?
Electricity ___________ a wire. It’s like water, ________. It also helps us like a ________. We use it to do ____________ things.
What does electricity look like?
We can’t see electricity, but we can ______ it ______ different _____ of energy. Electricity comes into our flat _______ thin wires, and these wires _______________ cables under the street. The cables are _____________________. We make ________ there.flows throughin a wayservantall kinds ofchangeintoformsthroughare connected toconnected to a power stationelectricityWhen Daisy came back, Benny with a ______ on his face. Benny was surprised that Daisy brought him some ______.
‘ Daisy’s right,’ said Dad. ‘they ________ electricity. The ________ inside ________ electricity.’
Mum said, ‘Who’s _____________ now, Benny?’grinbatteriescontainchemicalsproducelooking foolishA great person in electricity field and a video about electricityThe person
The videoBenjamin Franklin studied electricity, and is quite famous even today for his kite and key experiment with lightning.ListeningUnderstand the main points of a dialogueBefore you listen to the dialogue, please look at the materials in the text as much as possible. And then guess the whole meaning of the dialogue.
When you listen to the dialogue, pay attention to the beginning of the dialogue. ON
OFFON
OFFON
OFFON
OFFON
OFFON
OFFON
OFFON
OFFON
OFFlightsair conditioner fridgekettlewashing machinetelevisionvacuum cleanerrice cookeriron2Tapescript: Well, the other flats in your building are all right. Something is wrong with one of your machines. What about the washing machine? Was that on?
No, it was off. I wasn’t washing clothes at that time.
What was on then?
The usual things. The lights were on, of course, and the air conditioner. We always have the air conditioner on in the summer.MAN:WOMAN:MAN:WOMAN: Of course the fridge was on.
Yes, the fridge was on. And the television. It’s always on in our flat!
Were you vacuuming or ironing?
No, the vacuum cleaner was off. It was in the cupboard. The iron was on, though. My son was ironing. But it’s a brand new iron. It should be all right.
What about the kettle? Was the kettle on?
No, the kettle was off. But the rice cooker was on.MAN:WOMAN:MAN:WOMAN:MAN:WOMAN: Ah!
Yes. It was on last time when all the electricity went off too.
Right. The rice cooker could be your problem. Let me have a look at it. Is it working properly? Let me check the plug…WOMAN:MAN:MAN:LanguageModal verbsWhat do you know about modal verbs?
How many modal verbs do you know?
What’s the difference among them? Can Could May Might Must Ought to
Shall Should Will Would
Common Modal Verbs:P.S: Today we just learn three of them: can, may, must.1. Modal verbs do not take "-s" in the third person.
e.g. He can? speak Chinese.
2. Use "not" to make modal verbs negative, even in Simple Present and Simple Past.
e.g. They may not come to the party.
3. Many modal verbs cannot be used in the past tenses or the future tenses.
e.g. She musted study very hard. Modal verbs are special verbs which behave very differently from normal verbs. xCan (be able to)"Can" is one of the most commonly used modal verbs in English. It can be used to express ability or opportunity, to request or offer permission, and to show possibility or impossibility.
e.g. I can ride a horse.
Can they dance?
You cannot spell.
Using “can” in present, future and pastAsk and answerCan Kitty spell?
Yes, she can.____ Derek _______?
__________________ Kitty ______?
__________________ Kitty _________?
_____________CanmultiplyCanCanNo, he can’t.subtractYes, she can.Yes, she can.add“May” is most commonly used to express possibility. It can also be used to give or request permission.
e.g. She may be at home, or perhaps
at work. (possibility )
You may leave the table when you finish your dinner. (give permission)
May I use your bathroom? (request permission )May (perhaps)Using “may” in present, future and past"Must" is most commonly used to express certainty. It can also be used to express necessity or strong recommendation, "Must not" uses to prohibit actions, but it is very severe.

e.g. Students must pass a text to study at this school. (necessity )
You must take some medicine for that cold. (strong recommendation)
Jenny, you must not play in the street! (prohibition) Must (have to)Using “must” in present, future and pastWhat do the signs mean? Do you know?You must not cycle.You must be careful.You must turn left.You must not enter.You must pay ten yuan.You must keep silent.You must not turn right.You must not smoke.★ 情态动词情态动词不能单独作谓语动词，后接其它
动词原形做谓语，没有人称和数的变化。表示能够或不能做某事用can 或 can’t;
A bird can fly .
Fish can’t live without water.
2. 告诉人们必须或禁止做某事用must或mustn’t;
You must hand in your homework at once.
You mustn’t talk loudly in public.3. 表示请求或允许做某事may 或can;
May I come in ?
Can I open the door ?
★★★Notes :
1、can 和 be able to的区别 : be able to 有
人称数和时态的变化。
I can come tomorrow .
He was able to help the old lady.
I will be able to come tomorrow.
2、在回答must的疑问句时，否定回答常用
needn’t 或don’t have to表示不必，而不用
mustn’t 。
Must we stay here ?
No, you needn’t . ( No, you don’t have to .)Do exercise about modal verbs1 John____ come to see us tonight, but he isn’t very sure yet. A. may B. can
C. has to D. must
2 They _____ do well in the exam. A. can be able to B. be able to
C. can able to D. are able to
-May I take this book out?
-No, you_______. A. can’t B. may not
C. needn’t D. aren’t
4 You_____ go and see a doctor at once because you’ve got a fever. A. can B. must C. dare D. would
5 -Can you speak Japanese? -No, I_______. A. mustn’t B. can’t C. needn’t D. may not

6 Must I finish the work today? No, you __.
A. don’t B. won’t C. needn’t D. mustn’t7 You _____ talk loudly in the library.
A. don’t B. mustn’t
C. needn’t D. don’t have to
8 - You must come here at six tomorrow morning. -Sorry, I ____ be here so early. A. need B. can C. must D. can’t
9 After a long walk, the old man____ be tired now. A. must B. has to C. need D. canⅠ.用适当的情态动词填空：。
1.I can play football. __________you swim?
2.Don’t worry. You ________ return me this book tomorrow.
3.My grandma is ill. You _______ talk so loudly here .
4.I can’t play with you. I __________finish my homework first.
5.I__________ get up early tomorrow. because I have a meeting.
6.______________you please open the window? Canmaycan’tmustmustCan9. Nobody ___________live without air.
10._________he speak Chinese ?Yes ,a little.
11. The book _________ be returned before Saturday.
12.__________I come in ?Yes ,please.
13. You ________give up smoking at once. It’s bad
for your health.
14. Excuse me ._________I ask you a question?
15. __________you tell me where the station is ?
16. _______ I finish the work now ?No, you _________.
You _______ do it this evening.
17. May I use your dictionary ? Sorry , you _________.
I am using it now .
18. Look at the ground .It’s very wet .It _______
have rained last night. can Can mustMay must May Can Must needn’t can can’t must SpeakingAsk the students to listen to the tape carefully. And let them to find out what’s the difference between these two groups of words.1 a line a light a lock a look
2 a nine a night a knock a note3 line nine light night
lock knock lot knot/l/ /n/
/l/: students must put their tongue on the ridge behind their upper teeth and allow air to flow out of one or both sides of their mouth.
/n/: it is a nasal consonant, the tongue is in the same position, but they have to vibrate the sound through their nose.Tell the students it is a kind of competition. Give some time for them to prepare and then ask a few pairs of students to read the words or sentences out. Teachers can give points for them.1 A knock on the door a light in the night
a note on the floor.
2 Nine knots on nine lines.
3 Lucky Lily lives in London.
Nelly is her neighbour.

Lucky Lily plays all day.
Nelly has to labour.
No news from Norman.
No letter from Linda.
I’ll give Norman a call at nine.
And I’ll write a letter to Linda.Jonny’s father believes in safety first at home. Work in pairs. S1 is Jonny.S2 is Dad. Follow the example to make dialoguesS1: May I give the baby a bath?
S2: No, you may not. You must test the
water. Then you may give the baby a bath.(turn on the water heater/open the window)S1: May I turn on the water heater?
S2: No, you may not. You must open the window.
Then you may turn on the water heater.S1: May I go out now?
S2: No, you may not. You must put your toys
away. Then you may go out.(go out/put your toys away)S1: May I put the meat in the fridge?
S2: No, you may not. You must cover the meat.
Then you may put the meat in the fridge.(put in the fridge/cover the meat)S1: May I go to bed?
S2: No, you may not. You must lock the door.
Then you may go to bed.(go to bed/lock the door) This exercise shows various everyday situations which might be dangerous in some way. After doing the exercise teachers can ask the students to think about other situations in our daily life. Work in pairs and then ask students to perform it.e.g.: a stranger knocks the door /
electricity accident / fire accident…Writingclass rulespool rulesbar rulesrule signsWe can see rules everywhere: in the school, at the office and so on. But why do we make rules?a to encourage people to behave in the
right way
b to stop people from doing dangerous or
bad things.Making rulesTeachers can help the students to describe the whole picture. Let everyone know what happens in the picture and tell what manners are good or bad.
While describing the picture, make sure the students understand the phrases and words on page 67.Behave properly or not?Members of staff must :
1. ______________________ immediately. 2. __________________ tidy. 3. ___________ to customers. 4. _________ properly in the office.
Members of staff must not:
1. _______ on desks or chairs. 2. _____________ the window. 3. ______________ in the office. 4. ___________ in the office.Answer the telephoneKeep their desksBe politeDress Stand Lean out ofRead comicsSleep Office rulesActivity Ask students to think of one rule for the classroom. It can be a rule for the whole class or for a particular group of students.
Ask students to make any rules they like. Design the whole thing on a piece of paper. It can be a competition.Useful phrases动能
能够
最后
看起来愚蠢
流过
在某种程度上
所有形式
看起来像…
变成…
灯泡Movement energy
Be able to
At last
Look foolish
Flow through
In a way
All kinds of
Look like
Change … into
Light bulb连接
发电厂
注意
下棋
开/关
小心
熬夜
制定规条
有礼貌
接电话Connect to
A power station
Pay attention to
Play chess
Switch on / off
Be careful
Stay up late
Make rules
Be polite
Answer the telephone看漫画
探出窗口
办公室经理
鼓励某人做某事
制止某人做某事
用正确方法
出于许多原因
马上
Read comics
Lean out of the window
The manager of an office
Encourage sb to do sth
Stop sb from doing sth
In the right way
For many reasons
Immediately / right awayParaphrase I was able to trick Daisy at last.
I could trick Daisy in the end.
Electricity flows through a wire. It’s like water, in a way.
Electricity moves through a wire. It’s like water partly.
What does electricity look like?
What is electricity like?
The wires are connected to cables under the street.
The wires joined cables under the street.
Benny said politely, with a grin on his face.
Benny smiled and said with good manners.
You must turn left.
You have to turn left.