人教版（七下）Unit 4 Don’t eat in class.-Section A 2d—3c-ppt课件-省级优课-(配套教案编号：30106).ppt

1、 Dont eat in class. Dont arrive late for class Dont sleep in class. Dont run in the hallways. Dont talk . Dont play soccer in the classroom. Dont fight. Dont listen to music in the classroom. Say some school rules Dont play basketball in class. You have to play on the playground. What do you say to

2、him? Please play on the playground Dont arrive late for class. You must be on time for class! What do you say to him? Be on time for class,please! Dont listen to music in class. You must listen to the teacher carefully. What do you say to him? Listen to the teacher carefully. Dont wear your own clot

3、hes at school. You have to wear your school uniform. What do you say to him? Wear your school uniform,please! Dont sleep in class. Listen to the teacher carefully. What do you say to him? Dont talk in class. Be quiet ,please! What do you say to them? Dont wear the hat in class. Please put your hat i

4、nto the desk. What do you say to him? Dont eat in class. Please eat in the dining hall. What do you say to him? Dont fight. Be friendly to your classmate! What do you say to them? Dont run in the hallways. Please walk slowly. What do you say to him? You have to play on the playground. You must be on

5、 time for class. You cant listen to music in class. Play on the playground, please. Be on time for class ,please. Dont listen to music in class! 祈使句是表示请求、命令、建议等的句祈使句是表示请求、命令、建议等的句 子。通常省略主语子。通常省略主语 ，谓语动词一律，谓语动词一律 用用 。根据句子语气的强弱，句末用。根据句子语气的强弱，句末用 号或号或 号。号。 原形原形 感叹感叹 句句 you 一、祈使句的肯定式一、祈使句的肯定式 1. 以以 开头，简

6、称开头，简称 Do 型。型。 e.g. Come here. 到这儿来。到这儿来。 2. 以动词以动词 开头，简称开头，简称 Be 型。型。 e.g. Be quiet, please. 请安静。请安静。 行为动词原形行为动词原形 be 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 ， 使语气显得客气、有礼貌。如果在句尾使语气显得客气、有礼貌。如果在句尾 加加 ，应该用，应该用 与前句隔开。与前句隔开。 e.g. Go this way, please. 请这边走。请这边走。 please please 逗号逗号 二、祈使句的否定式二、祈使句的否定式 Do型和型和Be

7、型的否定式是在句首加型的否定式是在句首加 。 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。 dont 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.在图书馆保持安静。在图书馆保持安静。 Please look at the picture. / Look at the picture, please. Dont run in the classroom. Be quiet in the library. 4. 让我们帮他。让我们帮他。 5. 上课

8、不要迟到。上课不要迟到。 6.禁止游泳！禁止游泳！ Dont be late for class. Lets help him. No swimming! 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! 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 go. 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。

9、 “No+名词名词/动词动词 ing形式”表示禁止或规劝，形式”表示禁止或规劝， 常用于公共场所常用于公共场所。 e.g. No photos! 禁止拍照！禁止拍照！ No smoking！ 禁止吸烟！禁止吸烟！ 祈使句用来表示命令、建议，但我们也 可以用cant和have to ，must来表示。 E.g Dont open the door. You cant open the door. Please do your homework first. You have to do your homework first. Be on time for class ,please. You

10、must be on time for class. Library Rules 1. Dont talk. 2. _ 3. _ 4. _ Task1 Write the rules for the school library. Dont listen to music. Dont eat or drink. Dont take photos. 方法指导：方法指导： 1. 由图示可知都是一些禁止类的祈使句。由图示可知都是一些禁止类的祈使句。 2. 可知应用“可知应用“Dont + 动词原形”句子。动词原形”句子。 Task2 Discuss and make rules for the co

11、mputer room in your school. Computer Rules 1. _ 2. _ 3. _ 4. _ 5. _ 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 Rules 1. _ 2. _ 3. _ 4. _ 5. _ We must be quiet in the computer room. Dont ea

12、t or drink in the computer room. Dont run in the computer room. Wear slippers in the computer room. Clean the computer room every day. At my dream school, we dont 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. Yo

13、ur classmates vote for the Coolest School! At my dream school, we dont have to come to school every day. We can eat in the classroom. We can listen to music in class. We dont have to do homework. We dont have to wear school uniforms at school. We cant rule the country without rules. 没有规章制度就不能治理好国家.

14、Answer my questions Can we be late for class 导单词导单词 No rules,no manners. 无规矩不成方圆无规矩不成方圆 1. 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. 2. Eat? (he/

15、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: _ Then answer the questions. Yes, he does. Does he have to eat in the dining hall Can we listen to music in the hallways No, we cant. Can we wear a hat in

16、the classroom No, we cant. 1. Remember the sentences in the Grammar Focus. 2. Write five rules in your family. 拓展拓展 情态动词情态动词can的用法的用法 1. 表示能力（如体力和脑力方面），意为表示能力（如体力和脑力方面），意为 “能；会”等。例如：“能；会”等。例如： Can you speak English? 你会讲英语吗？你会讲英语吗？ 2. 表示请求或允许，多用在口语中，意为“可以；表示请求或允许，多用在口语中，意为“可以； 能”等。例如：能”等。例如： Can I he

17、lp you? 我能帮助你吗？我能帮助你吗？ 用于否定句表示不允许。例如：用于否定句表示不允许。例如： You cant play basketball. 你不能玩篮球。你不能玩篮球。 拓展拓展 情态动词情态动词can的用法的用法 用于疑问句中用来提出要求。例如：用于疑问句中用来提出要求。例如： Can you.？“请你？“请你好吗？”表示说话好吗？”表示说话 人的请求。人的请求。 Can I.？“我可以？“我可以吗？”用来征求对吗？”用来征求对 方是否允许自己做某事。如在句末加上方是否允许自己做某事。如在句末加上 please一词就显得更有礼貌了。例如：一词就显得更有礼貌了。例如： Can

18、you help me, please? 请你帮助我好吗？请你帮助我好吗？ 拓展拓展 情态动词情态动词can的用法的用法 3. 表示可能。例如：表示可能。例如： He can be at home now. 他现在可能在家。他现在可能在家。 The moon cant always be full. 月亮不可能常圆。月亮不可能常圆。 4. 表示怀疑。在表达此意时，只能用于一般表示怀疑。在表达此意时，只能用于一般 疑问句中，带有感情色彩。例如：疑问句中，带有感情色彩。例如： Can it be true? 那会是真的吗？那会是真的吗？ 拓展拓展 have to与一般情态动词的异同与一般情态动词的

19、异同 相同点：相同点： 一般的情态动词不能单独作谓一般的情态动词不能单独作谓 语，后面必须接动词原形一起语，后面必须接动词原形一起 构成谓语，构成谓语，have to 也是这样。也是这样。 拓展拓展 have to与一般情态动词的异同与一般情态动词的异同 不同点：不同点： 1、一般的情态动词没有人称和数的变化，而、一般的情态动词没有人称和数的变化，而 且所用的时态也受到一定的限制，而且所用的时态也受到一定的限制，而have to 有人称和数的变化。可用于多种时态中：有人称和数的变化。可用于多种时态中： 一般现在时中当主语是第三人称单数时要一般现在时中当主语是第三人称单数时要 用用has to，

20、其余的人称用，其余的人称用have to，一般过，一般过 去时中要用去时中要用had to。如：。如： She has to go to school by bus. 她不得不乘公汽上学。她不得不乘公汽上学。 拓展拓展 2、否定句和疑问句的构成方式不同： 一般的情态动词直接在后面加not构成否定句， 把这些情态动词提到句首就构成一般疑问句。 而have to 的否定句和疑问句的构成往往要借助 于助动词do的适当形式或助动词will即have to, has to, had to的否定式分别为dont have to, doesnt have to, didnt have to，疑问句是在句 首

21、加助动词do的相应形式,句中还原成have to。 如: What does she have to do? 她必须做什么？ You didnt have to wait for me yesterday. 昨天你没有必要等我。 have to与一般情态动词的异同与一般情态动词的异同 1.Mr Green smoke here, because theres a sign on the wall. It says “No smoking.” 2.Its very hot outside. You wear a hat. 3.We eat in the classroom, because it

22、s impolite to teachers. 4.I go to bed after 11:00 on school night. 5.The students read books and magazines in the library. cant can can can cant Practice 根据句意，用根据句意，用can和和cant填空。填空。 1.We_ clean our classroom after school. 2. She_ make her bed after getting up. 3. Its late. Mr Beckman_ go to work by car. 4. Emily and Peter join a music club. They _ practice guitar every day. have to have to has to has to 用用have to或或has to填空。填空。 Practice