Unit4 Don't eat in class SectionA Grammar Focus-3c课件 2023-2024学年人教版七年级英语下册

人教新目标Go For It七年级英语下册 Unit4 Don't eat in class SectionA Grammar Focus-3c Don’t run in the hallways. We can eat in the dining hall. We must be on time for class. We have to be quiet in the library. The expression of rules: 祈使句 can must have to Wise men learn by other men's mistakes; fools by their own can在本单元主要表示什么含义？它还可表达什么意思？ 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. can的意思是“能够；允许“，还可表示“能力” 。 Wise men learn by other men's mistakes; fools by their own Grammar Focus 情态动词在用法上有什么共同点? 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. can, must, have to后接动词原形。 Wise men learn by other men's mistakes; fools by their own 情态动词 have to 的用法 (1) have to 意为“必须；不得不”，后接动词原形，表示客观需要做的事情。 (2) have to 有人称、数和时态的变化，其 第三人称单数形式为 has to。 (3)含有 have to 或 has to 的句子需分别借助助动词 do 或 does 构成疑问句或否定句。 Wise men learn by other men's mistakes; fools by their own Library Rules 1.__________________ 2.__________________ 3.__________________ 4.__________________ Don’t talk. Don’t eat or drink. Don’t listen to music. Don’t take photos. Write the rules for the school library. 3a Wise men learn by other men's mistakes; fools by their own 祈使句的形式 (1)let开头的祈使句的肯定句：Let + sb.+ v.（原形） 例: 让我们帮助你。 Don’t let them come in. Let us help you. 否定为：Don’t + let + 第三人称代词+v.（原形） 例: 不要让他们进来。 Language points Wise men learn by other men's mistakes; fools by their own 祈