In this type of conditional sentence the condition is seen as impossible, so that the action of the main clause is not fulfilled.
Here are more examples:
Si hubiera llegado antes, habría visto a Carlos en la fiesta.If I had arrived earlier, I would have seen Carlos at the party.
Si hubiera llegado antes, hubieravistoa Carlos en la fiesta.If I had arrived earlier, I would have seen Carlos at the party.
Si tú hubieras firmado ese contrato, te habrías arrepentido.If you had signed that contract, you would have regretted it.
Si te hubieras llevado el paraguas, no te habrías mojado tanto.If you had taken the umbrella, you wouldn't have got so wet.
Si te hubieras llevado el paraguas, no te hubieras mojado tanto.If you had taken the umbrella, you wouldn't have got so wet.
Si no hubiéramos comprado esta casa, habríamos tenido más dinero para vacaciones.If we hadn't bought this house, we would have had more money for holidays.
Si no hubiésemos comprado esta casa, hubiésemos tenido más dinero para vacaciones.If we hadn't bought this house, we would have had more money for holidays.
Si usted hubiera venido a las diez, yo le habría atendido personalmente.If you had come at ten, I would have dealt with you personally.
You need auxiliary verb "haber" in both parts of the sentence: in the conditional clause after "si" and in the main clause.
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Si te hubieras llevado el paraguas, no te habrías mojado tanto.If you had taken the umbrella, you wouldn't have got so wet.Si hubiera llegado antes, hubieravistoa Carlos en la fiesta.If I had arrived earlier, I would have seen Carlos at the party.Si no hubiésemos comprado esta casa, hubiésemos tenido más dinero para vacaciones.If we hadn't bought this house, we would have had more money for holidays.Si te hubieras llevado el paraguas, no te hubieras mojado tanto.If you had taken the umbrella, you wouldn't have got so wet.Si no hubiéramos comprado esta casa, habríamos tenido más dinero para vacaciones.If we hadn't bought this house, we would have had more money for holidays.Si hubiera llegado antes, habría visto a Carlos en la fiesta.If I had arrived earlier, I would have seen Carlos at the party.Si usted hubiera venido a las diez, yo le habría atendido personalmente.If you had come at ten, I would have dealt with you personally.Si tú hubieras firmado ese contrato, te habrías arrepentido.If you had signed that contract, you would have regretted it.