be quiet
You must be quiet in the museum.
tidy your desk
You must tidy your desk in the school.
wear slippers
You must wear slippers in the swimming pool.
feed the animals
You mustn't feed the animals in the pet shop.
wash hands
You must wash hands in the hospital.
eat
You mustn't eat in the library.
touch the crocodiles
You mustn't touch the crocodiles in the zoo.
buy a ticket before you get on the train
You must buy a ticket before you get on the train at the train station.
throw away your rubbish
You mustn't throw away your rubbish in the park.
pay before you leave
You must pay before you leave the supermarket.
run on the stairs
You mustn't run on the stairs at the school.
return your books on time
You must return your books on time to the library.