Match examples of the past continuous (1-4) with uses a, b, c and d.

a)to express activities in progress before, and probably after, a particular time in the past.
b)for descriptions.
c)to express an interrupted past activity.
d)to express an incomplete activity in the past in order to contrast with the past simple that expresses a completed activity.

1.I was reading, a book during the flight.
2.At 7 o'clock I was having my breakfast.
3. Ann looked beautiful. She was wearing a red cotton dress.
4.When the phone rang, I was having a shower