(
课件网) Unit 4 Don’t eat in class. Section A Grammar Focus-3c Learning objectives 1. Functions: talk about rules 2. Grammar: ① 祈使句(重点为否定结构) ② 情态动词can表“许可”的用法(肯定及否定陈述， 一般疑问句结构及肯定和否定回答) ③ 情态动词must的句型结构(仅限肯定陈述) ④ 情态动词have to的句型结构(肯定及否定陈述，一般 疑问结构及肯定和否定回答) Presentation How to talk about rules Grammar Focus Don’t run in the hallways. Don’t fight. What are the rules We must be on time for class. Can we eat in the classroom No, we can’t, but we can eat in the dining hall. Can we wear a hat in class Yes, we can./No, we can’t. Does he have to wear a uniform at school Yes, he does./No, he doesn’t. What do you have to do We have to be quiet in the library. Observe this chart. Grammar Focus 祈使句的否定句怎样构成？肯定句呢？一般在什么情况下会用祈使句？ 情态动词在用法上有什么共同点？ can在本单元主要表示什么含义？它还可表达什么意思？ have to在句法上与其他情态动词有何区别？ Work in pairs and answer the questions. 课堂检测 Don’t run in the hallways. Don’t fight. What are the rules We must be on time for class. Can we eat in the classroom No, we can’t, but we can eat in the dining hall. Can we wear a hat in class Yes, we can./No, we can’t. Does he have to wear a uniform at school Yes, he does./No, he doesn’t. What do you have to do We have to be quiet in the library. Grammar Focus 祈使句的否定句怎样构成？肯定句呢？ 祈使句的否定句在动词原形前加don’t，表示“不要做什么事”。 祈使句的肯定句通常是以动词原形开头的。 Don’t run in the hallways. Don’t fight. What are the rules We must be on time for class. Can we eat in the classroom No, we can’t, but we can eat in the dining hall. Can we wear a hat in class Yes, we can./No, we can’t. Does he have to wear a uniform at school Yes, he does./No, he doesn’t. What do you have to do We have to be quiet in the library. Grammar Focus 一般在什么情况下会用祈使句？ 祈使句一般用于上级对下级，长辈对晚辈之间，表示命令、劝说或警告，也可表示请求。 Don’t run in the hallways. Don’t fight. What are the rules We must be on time for class. Can we eat in the classroom No, we can’t, but we can eat in the dining hall. Can we wear a hat in class Yes, we can./No, we can’t. Does he have to wear a uniform at school Yes, he does./No, he doesn’t. What do you have to do We have to be quiet in the library. Grammar Focus 情态动词在用法上有什么共同点？ can, must, have to后接动词原形。 Don’t run in the hallways. Don’t fight. What are the rules We must be on time for class. Can we eat in the classroom No, we can’t, but we can eat in the dining hall. Can we wear a hat in class Yes, we can./No, we can’t. Does he have to wear a uniform at school Yes, he does./No, he doesn’t. What do you have to do We have to be quiet in the library. Grammar Focus can在本单元主要表示什么含义？它还可表达什么意思？ can的意思是“能够；允许“，还可表示“能力” 。 Don’t run in the hallways. Don’t fight. Wh ... ...
