The nominative is the case of the subject of a finite verb and of a predicate noun in agreement with the subject.
a. On the nominative subject of the infinitive, see cross1973; in exclamations, 1288.940
Independent Nominative.—The nominative may be used independently in citing the names of persons and things: προσείληφε τὴν τῶν πονηρῶν κοινὴν ἐπωνυμία_ν συ_κοφάντης
τίθημι δύο ποιητικῆς εἴδη· θεία_ μὲν καὶ ἀνθρωπίνη
A sentence may begin with the nominative as the subject of the thought in place of an oblique case: οἱ δὲ φίλοι, ἄ_ν τις ἐπίστηται αὐτοῖς χρῆσθαι, τί φήσομεν αὐτοὺς εἶναι;
a. On the nominative in suspense see under Anacoluthon (Index).942
In referring to himself in letters a man may use his own name in the nominative, either in apposition to the first person contained in the verb ( cross976), or as subject of a verb in the third person: Θεμιστοκλῆς ἥκω παρὰ σέ
a. A speaker referring to himself in the third person usually soon reverts to the first person (
When there is no danger of obscurity, the subject may shift without warning: μίαν μὲν ναῦν λαμβάνουσιν, τὰ_ς δ' ἄλλα_ς οὐκ ἐδυνήθησαν, ἀλλ' ἀποφεύγουσιν
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].