Commencer belong to the 1st
group. Commencer is a very common french verb.
Commencer is conjugated the same way that verbs that end in : -cer
Commencer is conjugated with the two auxiliaries être
Commencer verb is
direct transitive, indirect transitive, intransitive.
French verb commencer can be conjugated in the reflexive form: Se commencer
verb is a direct transitive verb, so passive voice can be used.
Attention: passive voice can only be used when commencer verb is conjugated with auxiliary avoir.