Refuir belong to the 3rd group.
Refuir is conjugated the same way that verbs that end in : -ir
Refuir is conjugated with auxiliary avoir.
Refuir verb is
intransitive.
Refuir is a french third group verb. So, this verb is irregular and do not follow a regular conjugation pattern like first or second group verbs. Follow this link to see all the endings of the conjugation of most of the third group verbs : conjugation rules and endings for the second group verbs.