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1、 Unit 4Unit 4 Dont eat in class Dont eat in class!Dont eat in the classrooms !A: Can we.?B: No , we cant,but we can A: So, dont ！A: Can we.?B: No , we cant, but we can A: So, dont ！Dont listen to music in classrooms or hallways!Dont fightFight with each othersA: Can we.?B: No , we cant, but we can A

2、: So , dont . ！Do you have to ? Yes, we do. We have to No, we dont. We dont have to School rules1. Clean the classroom every day.2. Get to school before 7:00.3. Wear sports shoes for gym class.4. Be quiet in the library.5. Do homework on time.6.Wear a uniform at school.Does he have to ? Yes, he does

3、. He has to No, he doesnt. He doesnt have to School rules1. Clean the classroom every day.2. Get to school before 7:00.3. Wear sports shoes for gym class.4. Be quiet in the library.5. Do homework on time.6.Wear a uniform at school. have/ has to dont /doesnt have to必須必須 ，不得不，不得不不必不必1.我們必須穿校服嗎？我們必須穿校服

4、嗎？2.瑪麗必須在餐廳吃飯嗎？是的，她是。瑪麗必須在餐廳吃飯嗎？是的，她是。3.琳達(dá)，你不必在上午七點(diǎn)前到校。琳達(dá)，你不必在上午七點(diǎn)前到校。4. 他們?cè)趯W(xué)校不得不做什么呢？他們?cè)趯W(xué)校不得不做什么呢？5. 我們必須在圖書(shū)館保持安靜。我們必須在圖書(shū)館保持安靜。Do we have to wear a uniform?Does Mary have to eat in the dinning hall? Yes, she does.Linda, you dont have to get to school before 7 oclock.What do they have to do in the school?We have to be quiet in the library. dont have to + 動(dòng)詞原形動(dòng)詞原形 “ 不必或沒(méi)必要做某事不必或沒(méi)必要做某事”