οἶδ' ὅτι = I know that οἶσθ' ὅτι = you know that ἴσθ' ὅτι = know that! πάρειμι δ' ἄκων οὐχ ἑκοῦσιν, οἶδ' ὅτι = I'm here unwilling, before those who don't want me, I'm sure (Sophocles, Antigone 276)