If the champion had taken the fight seriously at first, he might have won it. / Unless the champion had taken the fight seriously at first, he wouldn't have won it.
If we had central heating, the house wouldn't be so cold. / Unless we had central heating, the house would be rather cold.
If I had a dog, I wouldn't mind being alone in the house at night. / Unless I had a dog, I would dislike being alone in the house at night.
If he didn't spend hours watching television, he would have time to do odd jobs in the house. / Unless he stopped spending hours watching television, he would never have time to do odd jobs in the house.
If I had a vacuum cleaner, I wouldn't be so slow. / Unless I had a vacuum cleaner, I would be so slow.
If I knew his address, I could write to him. / Unless I knew his address, I couldn't write to him.
If he shaved, he wouldn't look so unattractive. / Unless he shaved, he would look unattractive.
If you didn't work so fast, you wouldn't make so many mistakes. / Unless you slowed down your work, you would make so many mistakes.
If I didn't live so far from the centre, I wouldn't always be late for work. / Unless I lived closer to the centre, I would always be late for work.
If I had a map, I could direct you. / Unless I had a map, I wouldn't be able to direct you.
If people didn't drive so fast, there wouldn't be so many accidents. / Unless people drove slower, there would be so many accidents.
If English people didn't speak so quickly, I might be able to understand them. / Unless English people spoke slower, I wouldn't understand them.