I am concerned in this paper with the philological basis for Greek ontology, that is to say, with the raw material which was provided for philosophical analysis by the ordinary use and meaning of the verb einai, 'to be'. My question is: how were the Greek philosophers guided, or influenced, in their formulation of doctrines of Being, by the pre-philosophical use of this verb which serves to express the concept of Being in Greek?
Kahn, Charles H., "The Greek Verb 'To Be' and the Problem of Being" (1965). The Society for Ancient Greek Philosophy Newsletter. 95.