Unit 6 Don’t eat in class.Section A (Grammar Focus-3c)Ⅰ. 选句子配图A. Don’t talk. B. Don’t eat food and drink. C. Don’t take photos. D. Don’t drink. 答案： 1~4. CABDⅡ. 句型展示1. —— 她必须在图书室里保持安静吗？—— 是的。—______ she ______ ______ ______ quiet in the library? —Yes, she ______. 答案： Does; have to be; does2. —— 我们能在走廊里听音乐吗？—— 不，不能。—______ we ______ ______ music in the hallways? —No, you______. 3. 我们不必天天来上学。We ______ ______ ______ come to school every day. 答案： 2. Can; listen to; can’t 3. don’t have tohave to 必须；不得不◆Does he have to wear a uniform at school? 在学校里他必须穿校服吗？◆He has to help his mother cook dinner. 他得帮他妈妈做晚饭。◆He doesn’t have to clean the room. 他不必打扫房间。【探究总结】 have to 的用法(1)have to“”为情态动词，意为 必须，不得不 。第三人称单数 为 has to ，过去时为 had to, 将来时为 will have to 。(2) 否定形式和疑问形式要借助 do, does, did 等助动词来完成，其否定形式为 don’t/doesn’t/didn’t have to, 其疑问形式为：Do/Does/Did. . . have to. . . ? (3)have to 的同义词为 must ，但两者用法不同。①have to 强调客观需要。有人称和时态的变化。②must 强调主观看法； mustn’t “”意为 禁止 。无人称和数的 变化，且只能用在一般现在时中。【学以致用】 ① 他今天得去看望他爷爷。He ______ ______ visit his grandfather today. ② 今天你不必穿校服。You ______ ______ ______ wear your school uniform today. 答案：① has to don’t have to②Ⅰ. 选词填空quiet, eat, can’t, uniform, late 1. Don’t______anything in class. 2. Don’t talk loudly in the library. Please be______. 3. Don’t get up______on weekdays. 答案： 1. eat 2. quiet 3. late4. We______listen to music in the classroom but we can listen to it in the music room. 5. As a student, you have to wear your school______. 答案： 4. can’t 5. uniformⅡ. 句型转换1. I have to get up early. ( 改为一般疑问句 )______ you ______ ______ get up early? 2. He has to go shopping with his mother. ( 改为否定句 )He ______ ______ ______ go shopping with his mother. 答案： 1. Do; have to 2. doesn’t have to3. We can wear our own clothes. ( 改为一般疑问句，并作否定回答 )—______ we ______ our own clothes? —No, you ______. 答案： Can; wear; can’t
