Hi guys! My name's Donna and I am an athlete. As I take part in competitions very often, I have to follow some rules. For example: I must get up early in the morning to run for ninety minutes, I must eat healthy food, I must be disciplined, I mustn't smoke and I mustn't drink alcohol. Learn the rules of the presentation below to know a bit more about the modal verb must. I must go now, I must finish my training session. Bye!