Conclure belong to the 3
rd group.
Conclure is conjugated the same way that verbs that end in :
-ure
Conclure is conjugated with
auxiliary avoir.
Conclure verb is
direct transitive, indirect transitive, intransitive.
French verb conclure can be conjugated in the reflexive form:
Se conclure
Conclure verb is a direct transitive verb, so passive voice can be used.