1) I was having lunch at 1.30 p.m. yesterday.
2) What were you doing on this day last year?
I was playing table-tennis on this day last year.
3) What were you doing at 7.30 p.m. yesterday?
I was watching an interesting movie at 7.30 p.m. yesterday.
4) What were you doing at 10.30 p.m. yesterday?
I was having a shower at 10.30 p.m. yesterday.
5) What were you doing at 3 a.m. this morning?
I was sleeping at 3 a.m. this morning.
6) What were you doing at 8.30 a.m. this morning?
I was having my breakfast at 8.30 a.m. this morning.