French phrase
Avez-vous déjà participé à ~ ?
Meaning
Have you ever participated in ___?
When to use it
Asks whether someone has participated before. It is polite and natural for programs, events, or activities.
Example dialogue
Avez-vous déjà participé à un programme d'échange ?
Have you ever participated in an exchange program?
Oui, j'y ai participé l'année dernière, à Montréal.
Yes, I participated in one in Montreal last year.