观察下列句子，回答问题。

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 the 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.

1. Do型祈使句的构成
肯定句：________ (+宾语)+其他.
否定句：________+动词原形 (+宾语)+其他.
如：上学日请穿校服。__________________________________.
晚饭前不要看电视。__________________________________.
2. Be型祈使句的构成
肯定句：________+表语+其他.
否定句：________+be+表语+其他.
如：下次要细心。__________________________________.
上学不要迟到！_________________________________!