under this Act. Any person who, having contracted marriage under this Act or any modification or reenactment of this Act, during the continuance of that marriage contracts a marriage in accordance with customary law, commits an offence and is liable on conviction to imprisonment for a period not exceeding five years. 51. Forms. The forms contained in the First Schedule to this Act may be used in the cases to which they are applicable, with such alterations as may be necessary.