used to live....>> were living now i'm learning about past but i can't understand that. we used to live in a flat. now we live in a house in this sentence, can i change 'WERE LIVING' instead 'USED TO LIVE'? if it can't change, why it can't change? or if it can, what different do these setences have?we lived in a flat, now we live in a house does it correct?