Unit 4 Don’t eat in class. Section A （3a~3c）课件

课件31张PPT。Unit 4
Don’t eat in class.Section A
Period TwoObjectivesTo learn Imperatives Don’t…
Don’t run in the hallways.
To learn to use can for permission:
Can we eat in the classroom?
To learn to use modal verbs have to & must
We have to be quiet in the library.
We must be on time for class.Don’t ________________!Look and sayDon’t _____.fightDon’t _________________.run in the hallwayseat in the classroomLet's play a game!
Who knows these signs?Don’t _____________ class.arrive late forDon’t ____________
_______!listen to musicin class Observe and learnDon’t eat in the classroom.
Don’t fight.
Don’t run in the hallways.
Don’t arrive late for class.
Don’t listen to music in class.Have a think:
祈使句是怎样构成的？
一般在什么情况下会用祈使句？Don’t …
不要做……祈使句一般用于上级对下级，长辈对晚辈之间，表示命令、劝说或警告，也可表示请求。*主语一般为第二人称，但通常省略。
*肯定式一般以动词原形开头，
否定式通常在动词原形前加don’t。
*为使祈使句更委婉、有礼貌，可在祈使句开头或末尾加please。
*句末一般用句号，表示强烈语气时用感叹号。1. 肯定祈使句的常见句型结构：
① Do型：动词原形+宾语+其他.
Open the door, please.
② Be型：Be+表语. 如：Be a good boy!
③ Let型：Let+宾语+动词原形+其他.
Let’s+动词原形+其他.
Let me help you.
Let’s play tennis.祈使句的句型结构2. 否定祈使句的常见句型结构：
① Do型和Be型的否定式：
Don’t+动词原形 / be+其他.
Don’t forget me.
Don’t be late.
② Let型的否定式：
Don’t+let+宾语+动词原形+其他.
Let’s+not+动词原形+其他.
Don’t let him go back.
Let’s not go swimming.
③ 警示语：No+名词 / 动词-ing形式.
No talking.
将下面的句子改为祈使句，每空一词。
1. You can come in.
_____ ____, please.
2. I can help you.
____ me _____ you.
3. You can’t eat in class.
_____ _____ in class.
4. You can’t be late for school.
_____ _____ late for school.
5. You can’t talk in the library.
_____ talking in the library. Come inLet helpDon’t eatDon’t beNoPracticeObserve and learnHave a think:
1. 情态动词在用法上有什么共同点？
2. can在本单元主要表示什么含义？它还可表达什么意思？
3. have to在用法上与其他情态动词有何区别？情态动词can, must, have to 后面都接动词原形本单元can意为“可以”，表示请求、允许I?can?dance?and?sing.情态动词 can2) can还可表示能力，“能，会”-Can?the?students?run?in?the?hallways??
-Yes, they can./No, they can’t.
We can’t eat in the classroom.?肯定: 主语+can+动词原形+其他.
否定：
主语+can not/can’t+动词原形+其他.
疑问句: Can+主语+动词原形+其他?
肯定回答：Yes, 主语+can.
否定回答：No, 主语+can’t.情态动词can的句型结构:情态动词must表说话人的主观看法，表示必须、必要。无人称和数的变化 ，不能单独使用，必须与其后的动词原形构成谓语。
句型结构：主语+must+动词原形+其他.情态动词mustYou must come in time.
你必须按时来。
Meat must be?cooked?thoroughly.
肉必须彻底煮熟。情态动词have to have to 表示必须，强调客观需要，有不得不、被逼无奈做某事的意思。
此词既有人称、单复数的变化、也有动词时态的变化。
其否定形式和疑问句形式均需要借助助动词do才可以进行变化。have to的句型结构:
肯定：主语＋have/has/had?to＋V原形＋其他
否定：
主语+don’t/doesn’t/didn’t?have?to＋V原形＋其他
疑问句:
Do/Does/Did＋主语＋have?to＋V原形＋其他?1. She has to look after her mother at home.
2. We don’t have to clean the room today.
3. --Does he have to go to bed now?
--Yes, he does./ /No, he doesn’t . They _______wear the uniform every day.-Yes, ______.Look and say-Do you ___________ the
uniform every day?have to-No, ________.we dowe don’thave to wearShe _______do homework
every day.has toI _____________ my bedroom on weekends.have to cleanLibrary Rules
1. Don’t talk.
2. __________
3. __________
________
4. __________
_______Don’t eat.Write the rules for the school library. Don’t listen to music.Don’t take photos.3aUse the words to make questions about the rules. Then write answers according to your school.3b1. Be quite?
Q: Does she have to be quite in the library?
(she/have to/in the library)
A: Yes, she does.
2. Eat?
Q: ________________________________
(he/ have to/ in the dining hall)?
A: ________________________Does he have to eat in the dining hall?Yes, he does.3. Listen to music?
Q: ________________________________
(we/ can/ in the hallways)?
A: ________________
4. Wear a hat?
Q: _______________________________
(we/ can/ in the classroom)?
A: _______________Can we listen to music in the hallways?Can we wear a hat in the classroom?No, we can’t.No, we can’t.Make up five cool rules for your dream school. Share your rules with the class. Your classmates vote for the Coolest School! 1. We can eat in class.
2. We don’t have to come to school every day.
3. …3cYou can also describe other aspects of your dream school, such as:
*its location;
*the classes & the teachers;
*the facilities (swimming pool, tennis courts, cinema, etc.);
* the dining hall and the food;
* after-school activities;
* types of classmates …Now let’s make an oral presentation to the whole class.My dream school is …
There are …
It has…
At my dream school, we don’t have to come to school every day. We…注: 另附word文档。
点击此处链接用所给单词的适当形式填空。
1. Don’t ________(listen) to music in the
library.
2. Do we have to ______ (clean) the room
every day?
3. You can’t ________(wear) sunglasses in
the classroom.
4. Please ________ (arrive) at school on
time (准时).listencleanweararrive1. -- Can the students eat in the classroom?
(作否定回答)
-- No, ___________.
2. Bill has to play sports every morning.
(改为一般疑问句)
_____ Bill _____ ___ play sports every
morning? they can’tDoes have to按要求完成句子，每空一词。3. You can’t wear a hat in class.
(改为祈使句)
______ ____ a hat in class.
4. He has to see his grandparents on
weekends. (对划线部分提问)
What _____ he ____ ____ ____ on
weekends?
5. Come in, please. (改为否定句)
_____ _____ in, please. Don’t weardoeshave to doDon’t come1. 我们必须按时到校。
We must _____ _____ school ___ _____.
2. 你能把你的电子游戏带到学校来吗？
Can you _____ your computer game ___ 　　　
school? on timebring根据所给汉语完成英语句子，每空一词。toarrive at3. 周末迈克经常在外面吃饭。
Mike often ____ ______ on weekends.
4. 星期天你不必早起。
You _____ _____ ___ get up early on
Sundays.
5. 不要在走廊里乱跑。
______ ____ in the hallways. eats outsidedon’t have toDon’t run late, don’t, for school, arrive
2. music, listen to, in the classroom, don’t
3. eat, can’t, in the classroom, we

Form sentences.Don’t arrive late for school. Don’t listen to music in the classroom.We can’t eat in the classroom.Don’t run in the hallways.
We must be on time for class.
- Can we eat in the classroom?
No, we can’t, but we can eat in the
dining hall.
Does he have to wear a uniform at
school?
Yes, he does./ No, he doesn’t.
What do you have to do?
We have to be quiet in the library.课时重点回顾ReviewHomework1.Write down ten sentences about
what you can or can’t do in your house.
We can’t eat in bed.
We can’t fight. ...
2. Finish the exercises in Learning English.
3. Preview the new words and expressions.
4. Preview the rules in Dave’s house.