1.i am writing
2.i was writing
3.is sleeping
4.was sleeping
5.aren't doing/are playing
6.weren't doing/were playing
7.was reading
8.isn't reading
9.is going
10.what do you doing/i am drinking
11.were you drinking/no i weren't drinking/i were eating
12.was reading/is reading
13.is playing
14.was shining/were singing
15.are you eating
16.were you eating
17.is doing
18.was doing
19.is crying
20.was crying
21.i am enjoying