I give the imperative form :you must keep school clean ……………………………………………………………………………………………………you shouldn’t make noise ……………………………………………………………………………………………………….you mustn’t litter ……………………………………………………………………………………………………………………you should be quiet ………

The text seems to be a set of rules or guidelines, but you didn't provide a specific question. However, I can provide responses to each statement:

1. "You must keep school clean" - This is an important rule to maintain a healthy and conducive learning environment. Everyone should dispose of their trash properly and take care of school property.

2. "You shouldn’t make noise" - Noise can be disruptive, especially in a learning environment. It's important to respect others' need for quiet, especially during study or class time.

3. "You mustn’t litter" - Littering is not only disrespectful to others, but it's also harmful to the environment. Always use trash bins and encourage others to do the same.

4. "You should be quiet" - Similar to the second rule, being quiet is important in maintaining a conducive learning environment. It shows respect for others who are studying or focusing on their work.