Unit 6 Electricity Grammar课件

(共26张PPT)
Unit 6 Electricity
沪教牛津版 初一英语下册
Module 3 Natural elements
Grammar
Can you find out the sentences with “can” ,“can’t”, “must” ,“mustn’t”, “may” on page 73
你能找出73页文章中含有“can” ,“can’t”, “must” ,“mustn’t”, “may” 的句子吗？
Can you get me a packet of electricity - Yes, I can.
She can’t buy electricity in packets like sweets.
You mustn’t say that, Benny.
May I have my packet of electricity
Modal verbs情态动词
Modal verbs情态动词
请观察下列句子，圈出句中的情态动词，并尝试总结情态动词的意义和用法。
1. We can use electricity to do many things.
2. We can't see electricity.
3. -Can you get me a packet of electricity
- Yes, I can.
4. May I use your mobile phone
5. You may turn on the TV.
6. You must always be careful with electricity.
7. --Must I turn off the TV now
--No, you needn‘t/don’t have to.
我能总结出：
1. 情态动词________（有/无）人称和数的变化；
2. 情态动词后面跟的动词须用________；
3. 否定句式构成是在情态动词后面加 "________"。
4. 使用一般疑问句只需把情态动词_____________,其余不变,句号改为问号。
5. 以must开头的疑问句，否定回答一般用 .
无
原形
not
置于句首
needn't/don't have to
记忆力大比拼：watch the video and write down as many modal verbs as you can.
can
should
must
may
could
A can and cannot/can’t
P77 Modal verbs情态动词
We use can and cannot (can't) to say we are to do something.（能够或不能够做某事）
able or unable
sum up
tips:
can (过去式：could)
使用could的语气更为委婉。
A can and cannot/can’t
P77
① I can speak Spanish.我能讲西班牙语。
表示 ，意为“能，能够”
② Can I come in 我可以进来吗？
表示 ，意为“可以”，多用于口语
③ That can't be Mary--she is in the hospital.
那不可能是玛丽，她在医院。
表示 ，意为“不可能”，通常用于否定句或疑问句。
能力(ability)
请求许可(permission)
否定推测
观察下面的句子，我能得出：
请求许可 (permission)
否定推测 （certainty）
能力 (ability)
你可以切培根（bacon） 。
肯定句→
否定句→
一般疑问句→
肯定回答：
否定回答：
含有can 的句子结构
Have a try
You cut the bacon.
You cut the bacon.
you cut the bacon
Yes, I .
No, I .
can
can’t/cannot
Can
can
can’t/cannot
I have many friends. Look!
She’s Cindy. She can play chess.
But she can’t do kung fu.
I have many friends. Look !
She’s Kate. She can play the erhu.
But she can’t dance.
I have many friends. Look !
He’s Bob. He can cook. He can cook yummy potato chips.
Pair work：
What can/can't your partner do
Cindy
Kate
Bob
memory challenges
What can you do
I can...
B may and may not
We use may and may not to ask for and give .
In less formal situations(非正式场合), We also use and for the same purpose（目的）.
permission (许可)
can
cannot (can’t)
---May I have my packet of electricity？
Yes, you may/can.
No, you may not/can't.
---Can I slice the onion
sum up
① — May I use your phone 我可以借你的手机吗？
— No, you can't.不，你不可以。
表示 ，意为“可以”，用于疑问句中。
② Anna may know my phone number.
安娜可能知道我的电话号码。
表示 ,意为“可能”。
“请求许可(permission)”
“猜测(certainty)”
观察下面的句子，我能得出：
推测 （certainty）
请求许可 (permission)
Speak up
cover the meat
lock the door
switch off the electricity
test the water
tidy up
______change the bulb
For example:
Jonny: May I change the bulb
Dad: No, you may not. You must switch off the
electricity. Then you may change the bulb.
Johnny’s father is talking to Johnny about safety at home. Work in pairs. S1 is Johnny. S2 is Dad.Johnny的爸爸正在谈论家里的安全问题，请以小组为单位进行对话。
cover the meat
lock the door
switch off the electricity
test the water
tidy up
______ put the meat in the fridge
S1: put the meat in the fridge
S2: . You must . Then
you may put the meat in the fridge.
May I
No, you may not
cover the meat.
cover the meat
lock the door
switch off the electricity
test the water
tidy up
______ go to bed
S1: go to bed
S2: . You must . Then you may go to bed.
May I
No, you may not
lock the door
cover the meat
lock the door
switch off the electricity
test the water
tidy up
______ take a bath now
S1: take a bath now
S2: . You must . Then
you may take a bath .
May I
No, you may not.
test the water
cover the meat
lock the door
switch off the electricity
test the water
tidy up
______ go out now
S1: go out now
S2: .You must . Then you
may go out.
May I
No, you may not.
tidy up
P79 C must and must not
We use must and must not/mustn't to tell people or .
what to do
what not to do
sum up
① You must wash you hand before you eat. 饭前你必须先洗手。
You mustn’t smoke here. 你不许在这里吸烟。
表示 ，意为“必须；一定”，其否定形式表示“ ”。
② Jack and Dick must be twins. They look so much alike!
杰克和迪克准是双胞胎，他们长得太像了。
表示 ，意为“一定是”，常指有根据的，比较有把握的推测，仅用于肯定句。
禁止
规则、命令
猜测
观察下面的句子，我能得出：
猜测（certainty）
命令(order)
你吃饭前一定要洗手。
肯定句→
否定句→
一般疑问句→
— (肯定回答)
— (否定回答)
含有must 的句子结构
must 的否定形式mustn't意思是“ ”，一般Must 开头的疑问句的否定回答用“ ”或“ ”回答。
You wash you hand before you eat.
You wash you hand before you eat.
I wash my hands before I eat
Yes, you .
No, you /No, you .
禁止
needn't
don't have to
must
mustn’t
Must
must
needn’t.
don't have to
What do these signs mean
You mustn’t here.
You mustn’t here.
You mustn’t use your
here.
You mustn’t .
take photos
mobile phone
smoke
fish
假设班主任需要制作新的班规，现在请你根据下面的关键词和图片提示为新班规的制定出谋划策：
Group work
late/school/morning
talk loudly/in class
close/doors and windows/before/leave
copy/homework
watch/ TV/play/computer games/evening
......
Have a try
Dear Bill,
How is it going Do you like seeing films There is a cinema near my home and I often go there. It is very big. But before we see a film, there are strict rules. And everyone follow them. Let me tell you some of them.
First, you bring food or drinks to the cinema. Second, people take photos with their phones The answer is No. People use their phones to take photos. Third, when we walk to the cinema, we must show our tickets(票). At last, if we want to see a 3D film, we can get a pair of glasses. But if we break(损坏) them, we pay for them.
Do your cinemas have many rules I get to know them Please write back to me. See you!
Yours,
Mark
请用“can”, “can’t”, “may”, “must”帮Mark完成这封信。
must
can’t
can
can’t/mustn't
must
May/Can/Could
Summary
情态动词 用法 否定形式及含义 疑问句及回答 共同点
can 表示具有某种能力，意为“ ”，非正式场合也可以表示许可，相当于“may“ 情态动词后要使用
.
may 表示请求，允许，意为“ ” must 用来指定规则或者发出命令，意为“ ” 能够
可以
必须
cannot/can't
不能
--Can...
--Yes,...can.
--No,...can't.
may not
不可以
must not/mustn't
禁止
--May...
--Yes,...may.
--No,...may not/ can't/mustn't.
--Must...
--Yes,...must.
--No,...needn't/don't have to.
动词原形
HOMEWORK
1. 复习今天所学的三个情态动词的用法；
2.看视频，查找并归纳其他情态动词的用法。