Henry George Liddell, Robert Scott, A Greek-English Lexicon

A.say, the 1st pers. of pres. being used in Att. dialoguein emphaticrepetitions, παῖ ἠμί, παῖ boy Isay, boy! Ar.Nu.1145, Ra.37; otherwise only in 3sg. “ἠσί” Hermipp.1, Aeol. “ἦσι” Sapph.97, Dor. “ἠτί” Alcm.139.

II. impf. ἦν, 3sg. ἦ (the only part used by Hom., chiefly in Il., always at the end of a speech), ἦ, καὶ ἐπ᾽ ἀργυρέῃ κώπῃ σχέθε χεῖρα he spake and . . , Il.1.219, etc.; “ἦ ῥα, καὶ ἀμπεπαλὼν προΐει . . ἔγχος” 3.355, etc.; rarely with the subject expressed, “ἦ ῥα γυνὴ ταμίη” 6.390, cf. Theoc.22.75: freq. in Att. in the phrases ἦν δ᾽ ἐγώ said I, Pl.R.327c, etc.; ἦ δ᾽ ὅς said he, Cratin.192, etc.; “ἦ δ᾽ ὃς λέγων” Ar.V.795; “ἦ δ᾽ ἥ” Pl.Smp.205c; with the subject repeated, “ἦ δ᾽ ὃς ὁ Γλαύκων” Id.R.327b, etc.; later without “ὅς, ἦ δ᾽ ὁ Νεῖλος” Philostr. V A6.16. (Cf. Lat. aio, ad-agium: ἦ fr. Η῏κτ, hence ἠμί etc. on analogy of φῆ: φημί, etc.)