Some notes

1. PAST CONTINUOUS
It is used to express:
- actions which were happening in the past:
You were studying for the Pet exam when I was in
Paris
- narration: I was playing tennis when he came

2. PAST CONTINUOUS
Forma negativa:
I was not coming with you
They weren't saying anything
Forma interrogativa:
Were you trying to annoy me?
When was he going away?

3. PAST CONTINUOUS
Keywords:
- when
- at that moment
- In the meantime
- just