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它的肯定形式通常是________以开头。
don't
动词原形
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.
Question:
can 在本单元主要表示什么含义？
它还可以表达什么意思？
Answer:
can 在本单元表示“__________,”还可以表示“_____”。
能够；允许
能力
What are the rules? We must be on time for class. 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.
Question:情态动词在用法上有什么共同点？
Answer:情态动词can, must, have to后加_______。
Question:
have to 在句法上与其他情态动词有何区别？
Answer:
have to 有____________，而其他情态动词则没有。
动词原形
人称和数的变化
学以致用（Look and say）
1. Don't talk.
2.Don't eat in the library .
3.Don't listen to music in the library.
4.Don't take pictures / photos in the library.
Pair work
have to, be quiet ?
can , wear a hat ?
have to, eat ?
can, listen to music?