Réfléchir belong to the 2
nd group. Réfléchir is a very common french verb.
Réfléchir is conjugated the same way that verbs that end in :
-ir
Réfléchir is conjugated with
auxiliary avoir.
Réfléchir verb is
direct transitive, indirect transitive, intransitive.
French verb réfléchir can be conjugated in the reflexive form:
Se réfléchir
Réfléchir verb is a direct transitive verb, so passive voice can be used.