Помогите написать 10 предложений(must? mustnt) на тему: Верховодила поведения в публичном

You mast hold on to the handrails.

You must give way to the old.

You must hit the road.

You mustnt talk out loud.

You mustnt laugh out loud.

You mustn't disturb the passengers.

You mustnt fight with other.

You must be polite.

You must be careful.

You must watch the stops.