七年级英语下册-Unit-4-Section-A(Grammar-Focus-3c)ppt课件-人教新目标

Unit 4 Don’t eat in class. Section A(Grammar Focus-3c) Ⅰ. 选句子配图选句子配图 Don’t talk. Don’t listen to music. Don’t eat. Don’t take photos. 答案答案 : 1. Don’t eat. 2. Don’t talk. 3. Don’t take photos. 4. Don’t listen to music. Ⅱ. 句型展示句型展示 1. —— 她必须在图书室里保持安静吗她必须在图书室里保持安静吗 ? ———— 是的。是的。 —— she quiet in the library? —Yes, she . 答案 : Does; have to be; does 2. —— 我们能在走廊里听音乐吗我们能在走廊里听音乐吗 ? ———— 不不 , 不能。不能。 —— we music in the hallways? —No, you . 3. 我们不必天天来上学。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 to Does he have to wear a uni at school? 在学校里他必须穿着校服吗在学校里他必须穿着校服吗 ? 【【自主领悟自主领悟】】 (1)have to 为情态动词为情态动词 , 意为“必须意为“必须 , 不得不得 不”不” , 后接动词原形后接动词原形 , 有人称、时态和数的变化。其第三人有人称、时态和数的变化。其第三人 称单数形式为称单数形式为 has to, 过去式为过去式为 had to 。例如。例如 : It’s too late. I have to go home. 太晚了。我必须回家了。太晚了。我必须回家了。 (2)have to 的否定形式和疑问形式要借助于的否定形式和疑问形式要借助于 do/does/did 等助等助 动词来表示。例如动词来表示。例如 : You don’t have to clean the room now. 你现在没必要打扫房间。你现在没必要打扫房间。 【【用法辨析用法辨析】】 have to 与与 must 的区别的区别 have to强调客观上要求“不得不”强调客观上要求“不得不” must 强调个人主观感觉“必须强调个人主观感觉“必须 ; 有必要”。没有人有必要”。没有人 称、时态和数的变化。称、时态和数的变化。 mustn’t 意为“禁止”意为“禁止” 【【图解助记图解助记】】 【【活学活用活学活用】】 ①① 他今天得去看望他爷爷。他今天得去看望他爷爷。 He visit his grandfather today. ②② 今天你不必穿校服。今天你不必穿校服。 You wear your school uni today. ③③ 你必须买票进电影院。你必须买票进电影院。 You a ticket to go into the cinema. 答案答案 : has to① ② ② don’t have to ③ ③ must buy Ⅰ. 单项选择单项选择 1. —Can we wear hats in class? —— . A. Yes, we do B. No, we don’t C. Yes, we can D. Yes, we can’t 2. —Can I use your ruler? —Yes, you . A. may B. need C. can D. must 3. — do you have to do after school? —Do my homework, of course. A. WhatB. WhenC. WhereD. How 4. — late for school again. —Sorry, I won’t. A. Not beB. Don’t beC. Not D. Don’t 5. Which of the following pictures means“Please be quiet”? ⅡⅡ. 句型转换句型转换 1. We have to stay at home. ( 改为一般疑问句改为一般疑问句 ) you to stay at home? 2. Bob has to get home before nine o’clock. ( 改为否定句改为否定句 ) Bob get home before nine o’clock. 3. We can wear our own clothes. ( 改为一般疑问句改为一般疑问句 , 并作否定回并作否定回 答答 ) —— you your own clothes? —No, we . 答案 : 1. Do; have 2. doesn’t have to 3. Can; wear; can’t Ⅲ. 将将ⅠⅠ栏中的问句和栏中的问句和ⅡⅡ栏中的答语匹配栏中的答语匹配 ⅠⅠ 1. Can we eat in the classroom? 2. Can students talk in the hallways? 3. Do we have to wear a uni? 4. What is the first rule? 5. Do I have to wear a hat? ⅡⅡ A. Don’t fight. B. No, you don’t have to. It’s not cold today. C. Yes, we do. D. No, we can’t. E. Yes, they can. 答案 : 1 ～ 5. DECAB