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