If I _________ (win the lottery - past), I _________ (be rich - now).
If I had won the lottery, I would be rich.
If I _________ (be rich - now), I _________ (buy - past) the house we saw yesterday.
If I were rich, I would have bought the house we saw yesterday.
If I _________ (not have to work) so much, I _________ (go) to the party last night.
If I didn't have to work so much, I would have gone to the party last night.