If I COULD sit on a park bench all day, I WOULD ....
If I HAD more energy, I WOULD ....
She's still performs on stage, but ...
If she didn't perform on stage, she would probably travel the world.
He can cook, but if he...
If he couldn't cook, he would be a great writer.
If I HAD a million dollars, I WOULD ....
If I KNEW how to fly a plane, I WOULD ....
If I WERE Magda Gessler, I WOULD ....
He isn't single, but if ....
If he were/was single, he would probably start dating an actress.