-What were you doing at 8 o'clock yesterday morning?
-Yesterday at 8 a.m. I was having my breakfast.
-What were you doing at 2 o'clock yesterday?
-Yesterday at 2 p.m. I was walking in the park.
-What were you doing at 9 o'clock on Saturday night?
-Yesterday at 9 p.m. I was watching an interesting film on TV.
-What were you doing at half past ten yesterday morning?
-At half past ten yesterday morning I was reading a newspaper.
-What were you doing at 11 o'clock on Sunday morning?
-At 11 o'clock on Sunday morning I was playing football in the yard.
-What were you doing at half past three yesterday afternoon?
-At half past three yesterday afternoon I was writing a letter to my friend.