conjugation rules and endings for the first group verbs.
However, although the terminations are perfectly regular, stem can be irregular and have numerous variations.
Festoyer is conjugated the same way that verbs that end in :
-yer. Verbs ending in
-yer may transform the stem letter
« y » in
« i » before a silent endings.
It is the case for verbs ending in
-oyer and
-uyer (other than envoyer and renvoyer). They replace the
« y » with an
« i » before an unpronounced
« e », turning the preceding syllable in a diphthong. The prototypical verbs are broyer, noyer, ennuyer.