Affermir belong to the 2
nd group. Affermir is a common french verb.
Affermir is conjugated the same way that verbs that end in :
-ir
Affermir is conjugated with
auxiliary avoir.
Affermir verb is
direct transitive.
French verb affermir can be conjugated in the reflexive form:
S'affermir
Affermir verb is a direct transitive verb, so passive voice can be used.