Look at these examples of aller in the Conditionnel Passé:
Je serais allé en Australie si j'avais eu les moyens.I would have gone to Australia if I could have afforded it.
Notice that être is used - not avoir.
Just as with the Passé Composé, some verbs (mostly movement verbs) conjugate with être in the Conditionnel Passé:
je serais, tu serais, il serait, nous serions, vous seriez, ils seraient (Conditionnel) + allé (or other past participle)
Note also that the past participle allé changes if the person doing the action is feminine (allée) or masculine, and singular or plural (allés/allées).
See other lessons on Le Conditionnel Passé:
Conjugate regular -er, -ir, -dre verbs (+ avoir) in the past conditional in French (Le Conditionnel Passé)
Conjugate verbs with irregular past participles in the past conditional in French (Le Conditionnel Passé)
Conjugate devoir in the past conditional in French = should have (Le Conditionnel Passé)
Conjugate pouvoir in the past conditional in French = could have (Le Conditionnel Passé)
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Examples and resources
Elle serait allée les voir si elle avait eu le temps.She would have gone to see them if she had had the time.
Nous serions arrivés plus tôt s'il n'y avait pas eu d'embouteillage.We would have arrived earlier if there hadn't been a traffic jam.
Je serais allé en Australie si j'avais eu les moyens.I would have gone to Australia if I could have afforded it.
Selon Tom, elles seraient rentrées chez elles vers 3h.According to Tom, they apparently went home (lit.would have come home) around 3.
aller
partir
sortir
