THE PAST CONTINUOUS TENSE

AFFIRMATIVE NEGATIVE INTERROGATIVE
I was reading I was not (wasn't) reading Was I reading?
We were reading We were not (weren't) reading Were we reading?

    Example:
    She was writing a letter to her friend from Solnechnogorsk at 7 o'clock yesterday.
    She was not (wasn't) writing a letter to her friend from Solnechnogorsk at 7 o'clock yesterday.
    Was she writing a letter to her friend from Solnechnogorsk at 7 o'clock yesterday?