Unit4 Don27t eat in classSection A Grammar Focus-3cppt

1、.Unit 4Dont eat in class. .1. To learn Imperatives Dont: Dont 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。不要在楼道里跑。 _2. 不要打架。不要打架。

2、_3. 有什么规矩？有什么规矩？ _ 4. 我们必须按时上课。我们必须按时上课。 _Dont fight. Dont run in the hallways.What are the rules?We must be on time for class. .5. 我们可以在教室里吃东西吗？我们可以在教室里吃东西吗？ _6. 不能。但我们可以在餐厅里吃东西。不能。但我们可以在餐厅里吃东西。 _ _7. 我们可以在上课的时候带帽子吗？我们可以在上课的时候带帽子吗？ _Can we wear a hat in class? No, we cant, but we can eat in the din

3、ing hall. Can we eat in the classroom?8. 他在学校里必须穿校服吗？他在学校里必须穿校服吗？ _9. 是的，必须。是的，必须。/ 不，不必。不，不必。 _10. 你们必须做什么？你们必须做什么？ _ 11. 在图书馆里我们必须保持安静。在图书馆里我们必须保持安静。 _Yes, he does. / No, he doesnt. 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 Lea

4、rnDont eat in the classroom.Dont fight.Dont run in the hallways.Dont arrive late for class.Dont listen to music in class.Have a think:祈使句是怎样构成的？祈使句是怎样构成的？一般在什么情况下会一般在什么情况下会用祈使句？用祈使句？Dont 不要做不要做祈使祈使句一般用来表示请求、命令、劝说、句一般用来表示请求、命令、劝说、号召、警告等。号召、警告等。在祈使句中在祈使句中, 通常省略第二人称主语通常省略第二人称主语you。肯定式以动词原形开头，否定式一般在动肯定式

5、以动词原形开头，否定式一般在动词原形前加词原形前加dont。.一、祈使句的肯定式一、祈使句的肯定式1. 以行为动词原形开头，简称以行为动词原形开头，简称Do型型。 e.g. Come here. 到这儿来。到这儿来。2. 以动词以动词be开头，简称开头，简称Be型型。 e.g. Be quiet, please. 请安静。请安静。3. 以以Let开头，简称开头，简称Let型型。 e.g. Lets go! 咱们走吧咱们走吧! 注意：注意：有时可在祈使句的句首或句尾加上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，使语气显得客气、有礼貌。如果在句尾加果在句尾加pleas

6、e，应该用逗号与前句，应该用逗号与前句隔开。隔开。e.g. Go this way, please. 请这边走。请这边走。.二、祈使句的否定式二、祈使句的否定式1. Do型和型和Be型的否定式是在句首加型的否定式是在句首加dont。 e.g. Dont sit here. 不要坐在这儿。不要坐在这儿。 Dont be late. 别迟到。别迟到。2. 以以let开头的祈使句，其否定式有两种：开头的祈使句，其否定式有两种： 一种是直接在句首加一种是直接在句首加dont，另一种是，另一种是 “let +宾语宾语+not +动词原形动词原形+ (其他其他)”。 e.g. Dont let him g

7、o. 不要让他走。不要让他走。 Lets not go there. 咱们别去那儿。咱们别去那儿。注意：注意：“No+名词名词/动词动词 ing形式形式”表示禁止或表示禁止或规劝，常用于公共场所。规劝，常用于公共场所。e.g. No photos! 禁止拍照！禁止拍照！ No smoking！ 禁止吸烟！禁止吸烟！【运用运用】将下列句子翻译成英语。将下列句子翻译成英语。1. 请看这幅图画。请看这幅图画。2. 不要在教室里跑。不要在教室里跑。3. 让我们帮助他。让我们帮助他。Please look at the picture. / Look at the picture, please.Don

8、t run in the classroom.Lets help him.4. 在图书馆保持安静。在图书馆保持安静。5. 上课不要迟到。上课不要迟到。Be quiet in the library.Dont be late for class.Observe and learnHave a think:1. 情态动词在用法上有什么共同点？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？它在本单元主要表示什么含义？它还可表达什么意思？还可表达什么意思？3. have to在用法上与其他情态动词有在用法上与其他情态动词有何区别？何区别？情态动词情态动词can, must, ha

9、ve to 后面都接动词原形后面都接动词原形. 本单元本单元can意为意为“可以可以”，表示请求、，表示请求、允许。允许。如如:I can dance and sing.2) can还可表示能力还可表示能力, “能，会能，会”。如如:- Can the students run in the hallways? - Yes, they can./No, they cant.We cant eat in the classroom. .肯定句肯定句: 主语主语+can+动词原形动词原形+其他其他.否定句：否定句：主语主语+can not/cant+动词原形动词原形+其他其他.疑问句疑问句: Ca

10、n+主语主语+动词原形动词原形+其他其他?肯定回答：肯定回答：Yes, 主语主语+can.否定回答：否定回答：No, 主语主语+cant.情态动词情态动词can的句型结构的句型结构:.情态动词情态动词must表说话人的主观看法，表示表说话人的主观看法，表示必须、必要。无人称和数的变化必须、必要。无人称和数的变化 ，不能单，不能单独使用，必须与其后的动词原形构成谓语。独使用，必须与其后的动词原形构成谓语。句型结构：句型结构：主语主语+must+动词原形动词原形+其他其他.如如: You must come in time. 你必须按时来。你必须按时来。 The children must be

11、back before 6 oclock. 孩子们必须孩子们必须6点前回来。点前回来。.have to 表示必须表示必须, 强调客观需要强调客观需要, 有不得有不得不、被逼无奈做某事的意思。不、被逼无奈做某事的意思。 此词既有人称、单复数的变化此词既有人称、单复数的变化, 也有动词也有动词时态的变化。时态的变化。其否定形式和疑问句形式均需要借助助其否定形式和疑问句形式均需要借助助动词动词do才可以进行变化。才可以进行变化。.have to的句型结构的句型结构:肯定句：肯定句：主语主语have/has/had toV原形其他原形其他. 否定句：否定句：主语主语+dont/doesnt/didnt

12、 have toV原形其原形其他他.疑问句疑问句: Do/Does/Did主语主语have toV原形其他原形其他?如如: She has to look after her mother at home. We dont have to clean the room today. -Does he have to go to bed now? -Yes, he does./ /No, he doesnt . Library Rules Dont talk. _ _1. _Write the rules for the school library.Dont listen to music.D

13、ont eat or drink. Dont take photos. 3a Be 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 m

14、usic? (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 cant.Can we wear a hat in the classroomNo, we cant.At my dream school, we dont have to come to school every day

15、We can eat in classMake up five cool rules for your dream school. Share your rules with the class. Your classmates vote for the Coolest School!3cWe dont have to wear school uniformsWe dont have to do homework every dayDiscuss and make rules for the computer room in your school.Computer Room Rules _

16、_ _ _1. _We must be quiet in the computer room.Dont run in the computer room.Dont eat or drink in the computer room. Wear slippers in the computer room.Computer Room Rules _ _ _ _1. _We must be quiet in the computer room.Dont eat or drink in the computer room.Dont run in the computer room.Wear slipp

17、ers in the computer room. Clean the computer room every day. .Dont run in the hallways.We must be on time for class.- Can we eat in the classroom?- No, we cant, but we can eat in the dining hall.- Does he have to wear a uniform at school?- Yes, he does./ No, he doesnt.- What do you have to do?- We h

18、ave to be quiet in the library.课时重点回顾课时重点回顾I. 根据句意及括号内所给单词的提示填空。根据句意及括号内所给单词的提示填空。1. Dont _(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，每空根据括号内的要求完成下列各题，每空一词一词(含缩略形式含缩略形式)。1. Can they join the sports club? (补全肯补全肯定答语定答语)