Verified answer

No se si te refieres al tercer condicional.

If I had chosen not to work with my friends on the thesis, I would have finished by now

If I had spent all my scolarship money, I wouldn't have bought a flat screen

If I hadn't tried that videogame, I would have never known what it was about

If I hadn't eaten that hamburger, I would have been hungry

If I hadn't helped you with this, you would have been desperate