It is also best practice to agree in advance with the volunteer, any times when they will not be available, so that you can consider any continuity of service requirements.
Mae hefyd yn arfer da i gytuno ymlaen llaw gyda'r gwirfoddolwr, o ran unrhyw adegau na fyddent ar gael, fel y gallwch ystyried unrhyw barhad i ofynion gwasanaeth.