Pupils aren't allowed to speak in the corridor.
But they are allowed to speak on the playground.

Pupils aren't allowed to run on the playground.
But they are allowed to run during the PE lessons.

Pupils aren't allowed to ride a bike on the playground.
But they are allowed to ride to school.

Pupils aren't allowed to walk during the lessons.
But they are allowed to walk to school.

Pupils aren't allowed to take food or drink into a classroom.
But, they are allowed to eat or drink outside.