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Unit 4 Don’t eat in class
SectionA grammer focus-3c
1.能运用祈使句：
be on time, Don’t run in the hallway, Don’t fight, be quiet....
2.能运用情态动词 must,have to。
-- Does he have to wear a uniform at school
--Yes, he does. /No, he doesn’t.
We must be on time.
We have to be quiet in the library.
Learning goals（学习目标）
What is the name of the song
Let it go
Don’t let them in, don’t let them see
别让人知道，别让人看到
Be the good girl you always have to be
做个好姑娘，你必须一直都是
Conceal, don’t feel, don’t let them know
要隐藏，不要动真情，不要让别人知道
Well, now they know
好吧，现在他们知道了
What do they have in common
Let it go, let it go
随他吧，随他吧
Can’t hold it back anymore
反正再也无法隐藏
Let it go, let it go
随他吧，随他吧
Turn away and slam the door.
转过身关上门
What do they have in common
祈使句
动词原形开头
没有主语
句子单词数量少
表示“劝告”
Rule 1: Don’t fight.
Rule 2: Don’t eat in the classroom.
Rule 3: Don’t listen to music in class.
Rule 4: Don’t arrive/be late for class.
Rule 5: Don’t run in the hallways.
Rule 6: Don’t wear a hat in class.
Let’s read and learn
1.什么是祈使句？
表达命令,请求,劝告,警告,禁止等的句子。
2. 祈使句的特点: ①省略______;
②开头多为动词________。
主语
原形
探究一 ：祈使句
1. Sit down, please！请求
2. Put up your hand. 命令
3. Please call Mrs. Miller at 555-3721. 请求
祈
使
句
形
式
1. Don’t be late.
2. Don’t run in the hallways.
1. Be quiet, please！请求
2. Be on time at school.
1. No photos. =Don’t take photos 禁止
2. No talking. 禁止
3. No food. 禁止
1. Let’s join the art club.
2. Let’s go.
3. Let’s paly basketball. 建议
Do型
Don’t型
Be型
No型
Let’s型
Let’s learn
归纳：
观察例句1-5，祈使句的肯定句do型：
________：_________________
1. Sit down, please！
2. Put up your hand.
3. Please call Mrs. Miller at 555-3721.
4.Please talk to Mr. Zhang after school.
5.Eat in the dining hall. 在餐厅吃
Do 型
实义动词原形 + 其他
祈使句 :Do 型
Let’s learn
归纳：
观察例句1-4，祈使句的肯定句Let型：
________：___________________________________
1. Let’s join the art club.
2. Let’s run after school.
3. Let’s paly basketball. 一起打篮球
4. Let’s go. 一起去吧
Let 型
Let + 宾语 + 动词原形 + 其他
Let’s learn
祈使句 :Let’s 型
归纳：
观察例句1-5，祈使句的否定句式No型：
_________:_______________________________
1. No photos. 禁止拍照
2. No talking. 禁止讲话
3. No swimming. 禁止游泳
4. No food. 禁止吃东西
5. No music. 禁止听音乐
No +名词/动词-ing形式
No 型
Let’s learn
祈使句 :No 型
Don’t let them in, don’t let them see.
Be the good girl.
Let it go. Let it go.
Let it go. Let it go.
Let the storm rage on.
Turn away and slam the door.
否定祈使句
肯定祈使句
① Be型祈使句
③ Do型祈使句
② Let 型祈使句
Don’t be
1. It’s an important meeting. (not, be) late.
2. (not, make) any noise! Your mother is sleeping.
3. (not, talk) and (read) aloud.
4. The notice on the wall says “ ”. (no smoke)
5. (look) out! A c is coming.
6. (not, let) the baby cry.
7. Let’s (not say) anything about it.
Exercises
Don’t talk
Don’t make
read
No smoking
Look
Don’t let
not say
Don’t run in the hallways. Don’t fight.
What are the rules 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.
Can we wear a hat in class Yes, we can. / No, we can’t.
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.
改写为祈使句
Be on time for class!
Don’t eat in classroom!
Don’t wear a hat in class!
wear a uniform at school!
Be quite in the library!
Do you know the rules for the school library
3a Write the rules for the school library.
Library Rules
1. Don't talk.
2. ____________________
3. ____________________
4. ____________________
Don't eat or drink.
Don't listen to music.
Don't take photos.
__________________
Tips
1. 由图示可知都是一些禁止类的祈使句。
2. 可知应用“Don’t + 动词原形”句子。
Don’t run in the hallways. Don’t fight.
What are the rules 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.
Can we wear a hat in class Yes, we can. / No, we can’t.
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.
探究二：情态动词
你能找到三个情态动词吗？
What are the differences 有什么不同
2.can表许可，可以...
1.must 强调主观意愿，表“必须”
3.have to 强调客观意愿，表“不得不”
must/can/have to
+动词原型
How do we change them into negative ones (否定形式)
can表许可
must 强调主观意愿，表“必须”
have to 强调客观意愿，表“不得不”
can’t 表不允许
mustn’t 表“禁止”
don’t have to 表“没必要”
无人称和时态变化
有人称和时态变化
3b Use the words to make questions about the rules. Then write answers according to your school.
Eat
Q: _____________________________________ (he/have to/in the dining hall)
A: __________________
Does he have to eat in the dining hall
Yes, he does.
Listen to music
Q: ________________________________________(we/can/in the hallways)
A: __________________
Can we listen to music in the hallways
No, we can’t.
Wear a hat
Q: ______________________________________(we/can/in the classroom)
A: __________________
Can we wear a hat in the classroom
No, we can’t.
3c Make up five cool rules(五个很酷的规定) for your dream school. Share your rules with the class. Your classmates vote(投票) for the Coolest School!
1. We can eat in class.
2. We don't have to come to school every day.
3....
Let’s have a summary!
肯定形式
否定形式
祈使句
1. Do型
2. Be型
3. Please型
4. Let’s型
1. Don’t型
2. No型
根据短文用所给词的适当形式填空。
Dear Mary,
Now I’m at Bill’s home. Please (1)_______ (help) me do some things. First, (2)________ (get) some food for my dog Robot. After Robot finishes eating his food, you can (3)________ (clean) his small room. Then, (4)________ (take) him for a walk. (5)________ (not let) him be with Mom’s dog Frank. They will fight. Many thanks.
Your sister
Mona
help
get
clean
take
Don’t let
Thank you for listening

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