Question

I (live) in the old house when I first (meet) Rose.
She (think) we (meet) before she would have introduced us.
We (listen) to music when the parents (arrive).
the play (already, start) by the time we (arrive) at the theatre.

Answer 1

I was living in the old house when I first met Rose.
She thought we had met before she would have introduced us.
We were listening to music when the parents arrived.
The play had already started by the time we arrived at the theatre.