A period of supervision may be served before a commencement of a sentence.
A setting of (conductor pipe) may constitute a commencement of drilling.
A (commencement date) of an action may be relate_backed to a filing of a petition.
Anxiety can be over a possibility of a commencement of an action.
Parties can be from a commencement of an (employment relationship).
Recitation of an oath can be a part of a (commencement ceremony).