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课件网) Unit 2 No Rules, No Order 第三课时 Section A (Grammar Focus 3a—3d) 人教版 七年级 英语（下） Good morning，everyone！Today we are going to learn the grammar focus part. Let's read the sentences in 3a and find out the rules of sentence patterns. This is the Prohibitions Wall(禁令墙). Let me see how much you know about the school rules. Look at the signs and talk about them in different ways. Don’ t use your phone in class. Don’ t litter. Don’ t run in the hallways. Don’ t talk in class. Be quiet in class. No phone calls. No littering. No running. Ummm...Not bad, guys. If you have any suggestions about the school rules, please put them forward and perhaps I will adopt them on my wall. what kind of interesting sentences did you notice in the video Watch and say ... Turn back! Don’t be late! Let’s go! Just go to bed! It must be mistake! We have to move its paw. I can’t cook. Some of them sound so strong and tell us what to do right away, and some let us know what we're good at or what we have to do 祈使句&情态动词 Which sentences are imperative sentences Which sentences contain modal verbs What are the modal verbs Look and think Imperative Sentences 祈使句一般用来表示命令、请求、劝说、号召、警告、禁止等。 1. 什么是祈使句？ 通常省略主语you 其肯定形式常以动词原形开头，否定形式是在动词原形前加don’t。 祈使句句尾用句号或感叹号。 2. 祈使句的特点？ 肯定式 Turn back! Go to bed now! Do型：动词原形+其他 Be quiet, please! Be careful! Be型：Be+其他 Let’s go! Let’s have a rest! Let型：Let sb do+其他 3. 祈使句的类型？ 否定式 Don’t be late! Don’t smoke here! Don’t let him leave! Don’t型 Don’t be+其他 Don’t do+其他 Don’t let+其他 No photos! No smoking! No型 No+n. No+v.ing Summary 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，通常省略主语you，其肯定形式以动词原形开头，否定形式是在动词原形前加don’t。祈使句句尾用句号或感叹号，读时用降调。为表示礼貌，可以在句首或句尾加上please。句末用please时，前面通常加逗号。 Modal Verbs can, must, have to 1. 出现了哪些情态动词？ 情态动词用于表达说话人的态度、意愿、推测、建议、能力、义务等。 2. 情态动词的作用 没有人称和数的变化； 后面必须跟动词原形来构成完整的谓语。 3. 情态动词的特点 情态动词Can can可表示能力、许可、请求等。其否定形式为can’t/ cannot. eg. I can speak a little Frech. 我会说一点法语。（能力） We can’t run in the hallways.我们不能在走廊上奔跑。 （许可） Can you help me 你能帮助我吗？（请求） 情态动词Must must表示必须。常表示说话人的主观看法，其否定形式为mustn’t. eg. Must I finish my homework before eight o’clock Yes, you must. No, you mustn’t. No, you needn’t. No, you don’t have to. mustn’t 表示禁止：不许 情态动词Have to have to表示不得不。常强调客观需要。其否定形式为don’t have to。 1. 肯定句：主语+_____+_____. 2. 否定句：主语+ _____ have to+_____. 3. 一般疑问句：_____+ 主语+ have to+_____ Yes, 主语+_____./No, 主语+_____. do/does don’t/doesn’t have/has to 动词原形 动词原形 动词原形 Do/Does don’t/doesn’t Must & H ... ...
