Unit4 Don’t eat in class Section A Grammar Focus-3c课件（35ppt)

课件35张PPT。Unit 4Unit 4
Don't eat in class.

Section A
Grammar Focus-3cObjectives1. To learn Imperatives Don’t…:
Don’t run in the hallways.
2. To learn to use can for permission:
Can we eat in the classroom?
3. To learn to use modal verbs have to
& must:
We have to be quiet in the library.
We must be on time for class.1. 不要在楼道里跑。
_______________________
2. 不要打架。
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3. 有什么规矩？
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4. 我们必须按时上课。
__________________________Don’t fight. Don’t run in the hallways.What are the rules?We must be on time for class. Grammar Focus5. 我们可以在教室里吃东西吗？
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6. 不能。但我们可以在餐厅里吃东西。
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7. 我们可以在上课的时候带帽子吗？
___________________________Can we wear a hat in class? No, we can’t, but we can eat in the dining hall. Can we eat in the classroom?8. 他在学校里必须穿校服吗？
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9. 是的，必须。/ 不，不必。
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10. 你们必须做什么？
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11. 在图书馆里我们必须保持安静。
________________________________Yes, he does. / No, he doesn’t. Does he have to wear a uniform at school?What do you have to do?We have to be quiet in the library. 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……祈使句一般用来表示请求、命令、劝说、号召、警告等。
在祈使句中, 通常省略第二人称主语you。肯定式以动词原形开头，否定式一般在动词原形前加don’t。祈使句一、祈使句的肯定式
1. 以行为动词原形开头，简称Do型。
e.g. Come here. 到这儿来。
2. 以动词be开头，简称Be型。
e.g. Be quiet, please. 请安静。
3. 以Let开头，简称Let型。
e.g. Let’s go! 咱们走吧! 注意：
有时可在祈使句的句首或句尾加上please，使语气显得客气、有礼貌。如果在句尾加please，应该用逗号与前句隔开。
e.g. Go this way, please. 请这边走。二、祈使句的否定式
1. Do型和Be型的否定式是在句首加don’t。
e.g. Don’t sit here. 不要坐在这儿。
Don’t be late. 别迟到。
2. 以let开头的祈使句，其否定式有两种：
一种是直接在句首加don’t，另一种是 “let +宾语+not +动词原形+ (其他)”。
e.g. Don’t let him go. 不要让他走。
Let’s not go there. 咱们别去那儿。注意：
“No+名词/动词?ing形式”表示禁止或规劝，常用于公共场所。
e.g. No photos! 禁止拍照！
No smoking！?????? 禁止吸烟！【运用】将下列句子翻译成英语。
1. 请看这幅图画。
2. 不要在教室里跑。
3. 让我们帮助他。Please look at the picture. / Look at the picture, please.Don’t run in the classroom.Let’s help him.4. 在图书馆保持安静。
5. 上课不要迟到。Be quiet in the library.Don’t be late for class.Observe 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。如:I?can?dance?and?sing.2) can还可表示能力, “能，会”。如:-- Can?the?students?run?in?the?hallways??
-- Yes, they can./No, they can’t.
We can’t eat in the classroom.?情态动词can肯定句:
主语+can+动词原形+其他.
否定句：
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.如: You must come in time.
你必须按时来。
The children must be back before 6
o’clock. 孩子们必须6点前回来。情态动词musthave 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。情态动词 have tohave to的句型结构:
肯定句：
主语＋have/has/had?to＋V原形＋其他.
否定句：
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?如: She has to look after her mother at home.
We don’t have to clean the room today.
--Does he have to go to bed now?
--Yes, he does./ /No, he doesn’t . Library Rules
Don’t talk.
________________
________________
________________Write the rules for the school library.Don’t listen to music.Don’t eat or drink. Don’t take photos. 3aBe quiet? (she/have to /in the library)
Q: Does she have to be quiet in the library?
A: Yes, she does. Use the words to make questions about the rules. Then write answers according to your school.3b2. Eat? (he/have to/in the dining hall)
Q: ________________________________?
A: _____________
3. Listen to music? (we/can/in the hallways)
Q: ________________________________?
A: _____________
4. Wear a hat? (we/can/in the classroom)
Q: _____________________________?
A: ____________Yes, he does.Does he have to eat in the dining hallCan we listen to music in the hallwaysNo, we can’t.Can we wear a hat in the classroomNo, we can’t.At my dream school, we don’t have to come to school every day…We can eat in class…Make up five cool rules for your dream school. Share your rules with the class. Your classmates vote for the Coolest School!3cWe don’t have to wear school uniforms…We don’t have to do homework every day…Discuss and make rules for the computer room in your school.Computer Room Rules
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________________We must be quiet in the computer room.Don’t run in the computer room.Don’t eat or drink in the computer room. Wear slippers in the computer room.Computer Room Rules
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___________________________________We must be quiet in the computer room.Don’t eat or drink in the computer room.Don’t run in the computer room.Wear slippers in the computer room. Clean the computer room every day. 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I. 根据句意及括号内所给单词的提示填空。
1. Don’t ________(be) late next time, Jim.
2. I have to ________(finish) the work before 5:00 p.m.
3. Can we ________(play) games with those girls?
4. They must ________(think) about it.
5. Helen, _________(do) the dishes now.do ?befinish?play?think?II. 根据括号内的要求完成下列各题，每空一词(含缩略形式)。
1.??—Can they join the sports club? ?(补全肯定答语)
??? —Yes, ________?________.?
2.?She has to go to bed early. ?(改为一般疑问句并作否定回答)
—______?she _______ to go to bed early?
—________, ________ ________.?they can?No she doesn’t?Does have3.?You can’t swim in the river.? (改为祈使句)
________ ________ in the river.
4. Dance with them here.? (改为否定句)
________ ________ with them here.
5. I have to get up early on the weekend. ?(改为否定句)
I ________ ________ ________ get up early on the weekend.
6.?I have to?do my homework.? (对划线部分提问)
________?________?you have to ________?What do do??Don’t swimDon’t dancedon’t have to1. Remember the sentences in the
Grammar Focus.
2. Write five rules in your family.
3. Preview the new words and expressions.