Use must or mustn’t to make rules for skateboarding

Here are some rules for skateboarding using "must" and "mustn’t":

1. You must wear a helmet while skateboarding.
2. Skateboards must be in good condition before use.
3. You mustn’t skate in crowded areas or on sidewalks.
4. You must use designated skateboarding parks or areas.
5. You mustn’t perform tricks near pedestrians or vehicles.
6. You must always be aware of your surroundings while skateboarding.
7. You mustn’t skateboard at night unless wearing reflective gear.
8. You must follow local laws and regulations regarding skateboarding.
9. You mustn’t ride a skateboard under the influence of drugs or alcohol.
10. You must practice good sportsmanship and respect other skaters.

These rules help ensure safety and enjoyment for everyone involved in skateboarding.