answers to imperfetto p. 107
    Your wording may vary:
     1. imperfetto

    Usually, I would go to work by car. (...used to go...)
    When I was young, I didn’t study much. (...didn’t used to...)
    They would come every day to my house.
    Yesterday at 10, I was sleeping.
    On March 3, I was already in Italy.
    Three years ago, I was still working in a bank.

    2. imperfetto + imperfetto
     
    While I was eating, I was reading the newspaper.
    When he spoke, he was always nervous.
    She was walking, and talking on her cell-phone.

     3. passato prossimo

    I was in Italy for one week.
    I stayed at home all day.
    I studied from five until eight.
    I slept until nine this morning.

     
    4.passato prossimo + passato prossimo
     
    He opened the refrigerator and took the milk.
    First I turned on the lights, and then the TV.
    I called Dino and we talked for a long time.

    5. passato prossimo + imperfetto
     
    While I was walking, I ran into Livio.
    When I was in Rome, I visited the Vatican.
    While I was in the car, the cell-phone rang.
    I first met Angela when she was 16.