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 up
10/what are your sister doing...,is washing
11.come, come
12.work, works
13.does your sister study, studies
14.goes
15.isn't playing,plays