You must/ mustn't...
You must wash your hand
You must/ mustn't...
You mustn't swim here
You must/ mustn't...
You mustn't Smoke
You must/ mustn't...
You mustn't take photos here
You must/ mustn't...
You must put litter in the bin
You must/ mustn't...
You must be quite
You must/ mustn't...
You mustn't walk your dog here
You must/ mustn't...
You must do your homework
You must/ mustn't...
You must walk on the path
You must/ mustn't...
You mustn't...eat here
