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