Dont eat in class. Section A 句法语法,John: Hi, my names John. Its my first day at school. Alice: Hi, John. Im Alice. This is a great school, but there are a lot of rules. John: Really? What are some of the rules? Alice: Well, dont be late for class. This is very important. John: OK, so we must be on time. Can we bring music players to school? Alice: No, we cant. And we always have to wear the school uniform. John: I see. Alice: Oh, and we also have to be quiet in the library.,John: Hi, my names John. Its my first day at school. Alice: Hi, John. Im Alice. This is a great school, but there are a lot of rules. John: Really? What are some of the rules? Alice: Well, dont be late for class. This is very important. John: OK, so we must be on time. Can we bring music players to school? Alice: No, we cant. And we always have to wear the school uniform. John: I see. Alice: Oh, and we also have to be quiet in the library.,Dont be late for class.,祈使句：表示命令、请求、建议或劝告的句子。 肯定：（1）动词原形+其他 Stand up, please. 请起立。 （2）Be + adj. Be careful! 小心！ （3）Let sb. + 动词原形 Lets go to school together. 咱们一起上学去吧。,否定：（1） Dont + 动词原形 Dont stand up. 别站起来。 （2） Let sb. + not + 动词原形 Let them not play with fire. 别让他们玩火。 （3） No + 名词/doing No fishing. 禁止垂钓。,-Can we bring music players to school? -No, we cant. can （情态动词）“能够、可以” We can eat in the dining hall. But we cant eat in class.,表示请求允许,We also have to be quiet in the library. have to “不得不、必须”，侧重客观需要。must “必须、应该”，侧重主观要求。 I have to do my homework now. I dont have to do my homework now. Do you have to do your homework now? Yes, I do. / No, I dont.,You must go home now. You mustnt go home now. Must I go home now? Yes, you must. No, you neednt. / No, you dont have to.,完成句子,1. _ play in the street. 不要在大街上玩。 2. I _ look after my sister. 我不得不照顾我的妹妹。,Dont,have to,单项选择,( )1. We can eat in the dining hall. But we _ eat in the classroom. A. dont B. didnt C. cant D. arent ( )2. -Can you go out with your friends? -_. A. Yes, I cant B. Yes, please C. No, I cant D. Yes, I do,C,C,祈使句： 肯定：动词原形+其他；Be + adj.；Let sb. + 动词原形 否定：Dont + 动词原形；Let sb. + not + 动词原形；No + 名词/doing,-Can we bring music players to school? -No, we cant. “能够、可以”（表示请求允许）,must / have to用法区别： have to 侧重客观需要；must 侧重主观要求。 肯定、否定、疑问、回答方式。,