1.am not drinking, am writing 2.don't drink, drink 3.is your friend doing 4.does your friend go 5.is sleeping 6.sleeps 7.doesn't work 8.isn't sleeping, is working 9.get 10.what is your sister doing now 11.come, come 12.where does your cousin work, works 13.does your sister study at an institute, studies 14.goes 15.isn't, plays