When several people own a piece of property, which form of ownership can they not have?

The correct answer is tenants in severalty. This form of ownership refers to a situation where a single individual owns a property independently, without any co-owners. Therefore, it is not applicable when several people own a piece of property.

Joint tenancy, tenancy in common, and tenants by the entirety all involve multiple owners having an interest in a single property. In joint tenancy, co-owners have equal shares and the right of survivorship, meaning that if one owner dies, their share automatically passes to the other owners. Tenancy in common allows for ownership of unequal shares and does not include the right of survivorship, meaning an owner's share can be passed to heirs upon death. Tenants by the entirety is a special form of joint tenancy available only to married couples, which also includes the right of survivorship.

Since tenants in severalty refers exclusively to ownership by one individual, it cannot apply when multiple people are involved in owning the property.