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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
2. 祈使句的肯定句怎么样构成的？否定句呢？
1.圈出情态动词，情态动词在用法上有什么共同点？
3. can在本单元主要表示什么含义？它还可以表达什么意思？
4. have to在句法上与其他的情态动词的区别
祈使句
1.祈使句是表示命令、叮嘱、号召等的句子;
2.通常省略主语you;
3.句中谓语动词用动词原形;
4.祈使句有肯定和否定两种：
Don’t eat in class.
Come in, please! 请进！
Sit down, please. 请坐。
Don’t play sports in the classroom.
Don’t fight .
否定
肯定
Example:
肯定祈使句 否定祈使句
Sit down.