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课件网) 人教版英语7年级下册培优精做课件Unit 2 No Rules, No Oeder授课教师：Home .班级：7年级（*）班.时间：.Unit 2第3课时Section A(3a—3d) Don’t run in the hallways Arrive on time Be quiet in the library. No fighting! Wear the school uniform. … Brainstorm School rules Grammar Focus Read the sentences. Do the verbs in bold need to change forms Why Walk in the hallway. Don’t run! Be polite and treat one another with respect. Don’t litter. / You mustn’t litter. / You can’t litter. Can we bring our phones to class No, we can’t. We must keep them in our lockers. Can we eat snacks in class No, we can’t eat in class. We have to eat in the dinning hall. Imperatives and Modal verbs(can, have to, must). 肯定祈使句 否定祈使句 情态动词 3a 规则的表达方式 Imperative sentences : Affirmative 肯定祈使句 Imperative sentences：Negative 否定祈使句 can / can’t must have to 1.祈使句 祈使句一般用来表示请求、_____、劝说、号召、_____等。在祈使句中，通常省略_____。肯定式以_____开头，否定式在动词原形前加_____。 命令 警告 主语you 动词原形 don’t Observe and find 2.祈使句的类型 （1）Do型祈使句 例句：Walk in the hallway. Don’t run! （2）Be型祈使句 例句：Be polite and treat one another with respect. （3）Let 型祈使句 （4）其他类型的否定祈使句 No + v.-ing ! / No + n. 表示禁止 No parking here! No photos! never代替don’t， 加强语气。 Never give up! Let’s see the lions. Let him come in. 二 三 四 五 一 六 七 一、根据提示完成单词。(5分) 1. She can’t sleep well because there is too much _____ (噪音)next door. 2. When we are in a car, we must wear our seat _____(安全带). 3. My father has a big farm, and he _____(喂养) lots of animals every day. noise belts feeds 4. When we are in the school library, we should walk _____(轻声地). 5. Jim usually _____(离开)his home at 7:30 and gets to school at 7:50. 二 三 四 五 一 六 七 quietly leaves 3. 情态动词can, have to, must can have to must 含义 表能力，意为 “能；会” 表请求、许可，意为“可以” 不得不；必须 必须 例句 I can play badminton, but I can’t play the piano. We have to be quiet in the library. Don’t arrive late for class. We must be on time. 共同点 后跟动词原形 后跟动词原形 后跟动词原形 【拓展】 （1）have to与must的相同点 二者均可表示“必须”，后接动词原形，有时可以互换。 We have to / must follow the rules. （2）have to与must的不同之处 I must go now. 我现在必须走了。 must表示说话人的主观看法，语气较强烈 It’s too late and I have to go. 天太晚了，我不得不走了。 have to 往往强调客观需要 You mustn’t talk to your mother like that. 你不准和你妈妈那样说话。 mustn’t 表示“不准；禁止” You don’t have to come if you don’t want to. 如果你不想来就不必来。 don’t want to 表示 “不必” （2）have to与must的不同之处 I / We / You / He / She / It /They must arrive there today. 我/我们/你/你们/他/她/它/他们今天必须到那儿。 must无人称和数的变化 I have to clean my room today. 今天我不得不打扫我的房间。 She has to clean her room too. 她也不得不打扫她的房间。 have to 有人称和数的变化 二 ... ...
