Eastern dialects avoid this ambiguity by using "ukan" as the participle of 'to have', reserving "izan" for 'to be', and some grammarians employ "izan" and "ukan" in this way for convenience, but this could create confusion since most Basque speakers do not actually employ "ukan" (or even know it as a metalinguistic term). Other grammarians refer to 'to have' as *"edun", which is a hypothetical, unattested form derived from the finite stem "-du-"; again, the problem is that *"edun" does not exist in real Basque usage.