Bonjour,
Réponse :
Choose between simple preterit and past perfect.
They had gathered round the barbecue when we arrived.
Before they opened their restaurant, they had owned a burger joint.
I had bought my ticket to New York before I discovered you were going too.
Simple past pour les actions passées.
Past Perfect pour les actions antérieures à une action passée. On dit que c’est « du passé dans le passé ». Se forme : had + participe passé.