a. The copula is strictly the predicate or is a part of the predicate with its supplements.
b. The above verbs may also be complete predicates: ἔστι θεός
c. For the omission of the copula, see cross944.
d. A predicate substantive or adjective stands in the same case as the subject when coupled to it by a copulative verb ( cross939).
e. For εἶναι added to a copulative verb, see cross1615.
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].