A tenancy by the entirety is a concurrent ownership with the four unities of a joint tenancy but with a fifth element (the unity of marriage) added. Neither tenant in a tenancy by the entirety can sever the tenancy by acting alone. Under common law, it was not possible to convey to a husband and wife as tenants in common or as joint tenants. A conveyance to a husband and wife in joint tenancy or tenants in common under common law merely created a tenancy by the entirety. Under modern law, a conveyance of property to a husband and wife creates a presumption of a tenancy by the entirety. Note: Unmarried persons cannot be in a tenancy by the entirety.