Pupils aren't allowed to chew-gum, but they are allowed to eat candy .
Pupils aren't allowed to listen to music during the lessons, but, they are allowed to listen to music during the music lesson.
Pupils aren't allowed to speak with friends during lessons ,but they are allowed to speak with my friends during the break .
Pupils aren't allowed to use mobile phones ,but they are allowed to use mobile phones bring our calling card.
