Conditional Perfect Tense French:

the conditional perfect is...

commonly used in 'si' clauses: the conditional perfect explains what would or would not have happened, an action that was dependent upon something else happening or not happening, which is indicated by the past perfect.

how to form:

To form the conditional perfect, use the conditional of avoir or être, plus a past participle.

examples:

- si j'avais su l'heure de ton arrivée, je t'aurais trouvé à l'aérop = if I had known the time of your arrival, I would have found you at the airport
- 'j'aurais travaillé' = 'I would have worked'.

conditional form of être:

serais, serais, serait, serions, series, seraient

conditional form of avoir:

aurais, aurais, aurait, aurions, auriez, auraient