In class you must / mustn't eat sweets
mustn't
In class, I must / mustn't make noise
mustn't
In class, you must / mustn't help your classmates
must
In class, you must / mustn't listen to music on your phone
mustn't
In class, I must / mustn't be on time
Must
In class, I must / mustn't make a mess
Mustn't
In class, you must / mustn't help your teacher
Must
In the museum, you must / mustn't take photos
Mustn't
In the museum, you must / mustn't run
Mustn't
At home, you must / mustn't eat too much ice cream
Mustn't
You must / mustn't drink more water
Must
At home, you must / mustn't spend time with your parents
must
At home, you must / mustn't do your homework
must
In the museum, you must / mustn't be quiet
must
At home, I must / mustn't take my brother's things
mustn't
