The Greek verb 'to be' (εἰμί) in its various conjugated forms expressing existence, identity, or predication. This highly irregular verb appears in numerous dialectal variations across Greek literature. As the most fundamental copula, it links subjects with predicates, asserts existence, or identifies location and state. The verb serves as the backbone of Greek predication, enabling statements of what something is, where it is located, what characteristics it possesses, or simply that it exists. Biblical Greek employs it constantly for existential statements, identification of Jesus as Messiah, and theological predications about God's nature.