Составить по 3 предложения (настоящее простое время, наст. продолженное вопросительное, утвердительное и отрицательное. ! .

My friend works in a homeless shelter. Does my friend work  in a homeless shelter? My friend doesn't work in a homeless shelter.
I'm doing you a favor. Am I doing you a favor? I'm not doing you a favor.
They made a terrible mistake. Did they make a terrible mistake? They didn't make a terrible mistake.