Simple Present - You eat an apple Do you eat an apple? Don't you eat an apple? You don't eat an apple. Present Continuous - You are walking right now Are you walking right now? Aren't you walking right now? You aren't walking right now. Present Perfect - You have travelled to London three times Have you ever been travelled to London? Só sei essas duas formas. Future - You will study You won't study Will you study? Won't you study?