Guys can someone help me? I'm from Brazil and I need to do a job about a simple future and I can't understand the difference between will and going to. For example: At school you should always write using will and in other formal things can't you use going to? And on a daily basis I can only use will? What does English grammar say about this?

Mohammed reads this sentence. we knew the runner was an amateur because experts can run much faster. based on the contrast clue, what prediction does mohammed most likely make about the meaning of amateur? it means "someone who likes running." it means "someone who dislikes running." it means "someone who has a lot of experience." it means "someone who has very little experience."