Question

Decide what must or mustn't o ar school.
Shout in corridors.

be polite.
What for you the lessons.
Leave school without permission.
Smoke.

Must Mustn't

me ajudem pls ​​

Answer 1

mustn't:
Shout in corridors.
Leave school without permission.
Smoke.

must:
be polite.
Do the lessons.