Fiancer belong to the 1
st group. Fiancer is a common french verb.
Fiancer is conjugated the same way that verbs that end in :
-cer
Fiancer is conjugated with
auxiliary avoir.
Fiancer verb is
direct transitive.
French verb fiancer can be conjugated in the reflexive form:
Se fiancer
Fiancer verb is a direct transitive verb, so passive voice can be used.