В английском языке есть модальный глагол must, он используется, если вы говорите о правилах.Seven rules for being healthy:1. You must eat a lot of fresh fruit and vegetables.2. You must spend a lot of time outside and do outdoors activities.3. You mustn\'t watch TV more than 30 minutes a day.4. You must do morning exercises every day.5. You must see your doctor twice a year.6. You must have a cool shower every morning and every evening.7. You mustn\'t eat too much ice-cream when it\'s cold outside.Если нужно дать совет, вместо must используется should.