conjugation rules and endings for the first group verbs.
However, although the terminations are perfectly regular, stem can be irregular and have numerous variations.
Avoyer is conjugated the same way that verbs that end in :
-oyer. The verb
envoyer and similar verbs have irregular future and conditional tenses. The future stem of this verb is
enverr-, resembling
voir more than
envoyer. This gives the future tense
j'enverrai, tu enverras... and the conditional tense
j'enverrais, tu enverrais...