Mésoffrir belong to the 3rd group.
Mésoffrir is conjugated the same way that verbs that end in : -frir
Mésoffrir is conjugated with auxiliary avoir.
Mésoffrir verb is
intransitive.
Mésoffrir 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.