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