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