Question

Read the sentences and find some keys to the Past Progressive
1)It was raining when we went our in the street
2)I was doing me homework when the film started
3)At 2 o'clock yesterday l was waiting for you at the station
4) i was listening to my favourite song at 11 o'clock

Answer 1

1)when
2)when
3)at 2 o'clock 
4)at 11 o"clock