Say why you must/mustn't do the listed actions.

- Wear a seat belt: You must wear a seat belt to ensure your safety in case of an accident. - Look both ways when you cross the road: You must look both ways to ensure no vehicles are coming and it is safe to cross. - Walk on the pavement: You must walk on the pavement to stay safe from vehicles on the road. - Talk to the driver: You mustn't talk to the driver to avoid distracting them and causing an accident. - Run onto the road: You mustn't run onto the road to avoid sudden accidents with moving vehicles. - Lean out of the window: You mustn't lean out of the window to avoid the risk of injury.