Advanced Conditionals
They canceled all the flights out of Chicago today because of the blizzard. If it [not snow] so hard, I would not be stuck in the airport.
hadn't snowed / hadn't been snowing
Charles arrived late again to work yesterday. He came running into the office complaining of car problems, but everyone knew it was a lie. If the boss [stand] there when he showed up, I am sure he would have been fired.
had been standing
If I were in Hawaii right now, I [sunbathe] on a beach. I would not be stuck here in this office with mountains of paperwork.
would be sunbathing