Basil L. Gildersleeve, Syntax of Classical Greek

As the imperative is equivalent to “δεῖ” or “χρή” with the infinitive, it is occasionally used in dependent and interrogative sentences. Familiar is the phrase “οἶσθ᾽ ὃ δρᾶσον”;

“ᾧ . . . ἐξέστω καὶ μή, τοῦτο νομοθετησώμεθα”, PLATO, Legg. 935E; Let us regulate by law to whom this is to be allowed and to whom not. “οἶσθ᾽ οὖν ὃ δρᾶσον”; AR. Eq. 1158; Knowest thou what thou must do? (Cf. v. 1160: “δρᾶν ταῦτα χρή”.) “μὴ ἐξέστω δὴ παρὰ ταῦτα ἕτερα προστάττειν”; PLATO, Politic. 296A; He is not to be permitted, then, to make other additional regulations?

DEM.1.20: “λέγουσιν δὲ καὶ ἄλλους τινὰς ἄλλοι πόρους, ὧν ἕλεσθ᾽ ὅστις ὑμῖν συμφέρειν δοκεῖ”. 20.14: “οὐδὲ γὰρ εἰ πάνυ χρηστός ἐσθ̓, ὡς ἐμοῦ γ᾽ ἕνεκ̓ ἔστω, βελτίων ἐστὶ τῆς πόλεως τὸ ἦθος”. [42], 31: “ὃ μηδαμῶς νυνὶ γενέσθω” (417).

LYS. fr. 75.3: “ἐδεήθη ἥκειν αὐτὸν ἐπὶ κῶμον, λέγων ὅτι μεθ᾽ αὑτοῦ καὶ τῶν οἰκετῶν πιέτω”.

PLATO, Legg. 800E: “τὸ δὲ τοσοῦτον ἡμᾶς αὐτοὺς ἐπανερωτῶ πάλιν . . . εἰ πρῶτον ἓν τοῦθ᾽ ἡμῖν ἀρέσκον κείσθω”. Politic. 296 A (see above).

THUC.4.92.7: “ὧν χρὴ μνησθέντας ἡμᾶς . . . ὁμόσε χωρῆσαι τοῖσδε καὶ δεῖξαι ὅτι ὧν μὲν ἐφίενται πρὸς τοὺς μὴ ἀμυνομένους ἐπιόντες κτάσθων, οἷς δὲ γενναῖον τὴν . . . αὑτῶν ἀεὶ ἐλευθεροῦν μάχῃ . . . ἀνανταγώνιστοι ἀπ᾽ αὐτῶν οὐκ ἀπίασιν”.

HDT.1.89: “κάτισον τῶν δορυφόρων ἐπὶ πάσῃσι τῇσι μύλῃσι φυλάκους, οἳ λεγόντων κτἑ”.

AR. Eq. 1158 (see above). Pax, 1061: “ἀλλ᾽ οἶσθ᾽ ὃ δρᾶσον;” Av. 54. 80.

EUR. Hec. 225: “οἶσθ᾽ οὖν ὃ δρᾶσον”; Heracl. 451: “ἀλλ᾽ οἶσθ̓ ὅ μοι σύμπραξον”.

SOPH. O. C. 731: “ὃν μήτ᾽ ὀκνεῖτε μήτ᾽ ἀφῆτ᾽ ἔπος κακόν” . O. R. 543: “οἶσθ᾽ ὡς ποίησον;”