Положительные: 1 you have to say thank you to be more polite with people. 2they have to study hard to pass the exams. 3he has to work out to be more strong to protect his girlfriend. 4i have to go outside to breathe fresh air.отрицательные: 1you don't have to say that .2you don't have a new car yet, don't you? 3you don't have to eat fast-food, it's not good for your health.
