Yes. They are all OK.Dear teachers,
Do all the sentences below sound fine to you? The original one is:
The phone ______ (ring) as I ______ (leave) the house.
That's what I came up with:
The phone was ringing as I left the house (the former considered a process, the latter considered a completed action)
The phone rang as I was leaving the house (the former viewed as a completed action, the latter - as a process)
The phone was ringing as I was leaving the house (two processes happening simultaneously)