To form the conditional perfect, the auxiliary verb "haber" is used in the conditional form with the past participle. The conditional perfect tense is used in sentences that present hypothesis contrary to facts in the past or probability.
yo habría hablado
I would have talked
tú habrías hablado
you would have talked
él/ella/usted habría hablado
he/she/you would have talked
nosotros habríamos hablado
we would have talked
vosotros habríais hablado
you would have talked
ellos/ellas/ustedes habrían hablado
they/you would have talked
yo habría servido
I would have served
tú habrías servido
you would have served
él/ella/usted habría servido
he/she/you would have served
nosotros habríamos servido
we would have served
vosotros habríais servido
you would have served
ellos/ellas/ustedes habrían servido
they/you would have served
- Si tu hermano hubiera avisado, habrían podido visitarlo.(If your brother had informed them, they would have been able to visite him.)
- Se habrían visto. (They had probably seen each other.)