Unit 4 Section A Grammar Focus-3c 课件 2022-2023 学年人教版英语七年级下册

Unit 4 Don’t eat in class. Section A 2a-2d Grade 7 There are many school rules in our school. Read them. 5. No Smoking(吸烟). 3. Don’t fight with classmates. 1. Don’t sleep in class. 4. Don’t play basketball in the classroom. 2. Don’t run in the hallways. 6. We can’t arrive late for class every day. 7. We must finish the homework on time. 8. We must be quiet in the classroom. Revision Warming-up Watch and remember the school rules the students break. No Smoking(吸烟). Don’t fight with classmates. Don’t sleep in class. Don’t play basketball in the classroom. Don’t run in the hallways. We must be quiet in the classroom. Leading-in Talk about the school rules. How many school rules did they break? Six. What rules are they? 语法探究之一 方框里是什么句型？ 否定祈使句 Presentation 祈使句 祈 使 句 Presentation 1.定义：一般用来表示请求、命令、劝说、号召、警告、禁止等语气的 句子叫祈使句。通常省略第二人称主语you。 2.种类：① 肯定式祈使句。以动词原形开头。 例如：Lisen to the teacher. ② 否定式祈使句。在动词原形前加don’t。 例如：Don't arrive late for class. 3. 注意：为表示礼貌，祈使句中经常在句前或者句末加please。句末用 please时，前面通常加逗号。 例如：Please call Karen at 555-8823. Come in, please. 4. Let: 以let开头的句子也是祈使句的一种结构，常用于第一、三人称， 表示建议、邀请和劝说等。 例如：Let me tell you the way to my house. Let him come in. Practice Don’t take photos. Don’t listen to music. Don’t eat. 语法探究之二 must意思是 “ ” have to意思是 “ ” Presentation must & have to 必须 不得不；必须 Presentation 辨析：must & have to 相同点：have to 与must都可表示“必须”意义很接近，有时可与must 互换。 例如：We have to/must follow the rules. 不同点： 1) must通常表示的是说话人的主观看法，语气比较强烈，have to往往 强调客观需要。 例如：I must go now. It's a little late and I have to go now. 2) 它们的否定式含义大不相同。mustn't表示“不准；禁止”,而don't have to表示“不必”。 例如：You mustn't talk to your mother like that. You don't have to come if you don't want to. 语法探究之三 想一想：方框里can或can’t的意思及用法和Ca