Concordancia Strong's

1. to know , εὖ οἶδα I know well; εὖ ἴσθι be assured : often with accusative rei, νοήματα οἶδε, μήδεα οἶδε he is versed in counsels, (Homer); with neut. Adjs., πεπνυμένα, φίλα, ἀθεμίστια εἰδώς (Homer); also with genitive, τόξων εὖ εἰδώς cunning in the use of the bow; οἰωνῶν σάφα εἰδώς (Odyssey by Homer): —; χάριν εἰδέναι τινί to acknowledge a debt to another, thank him , (Iliad by Homer), etc.:—;the Imperat. in protestations, ἴστω Ζεὺς αὐτός be Zeus my witness , (Iliad by Homer); doric ἴττω Ζεύς, ἴττω (Aristophanes Comicus): —; εἰδώς absolute one who knows , εἰδυίηι πάντ᾽ ἀγορεύω (Iliad by Homer); ἰδυίηισι πραπίδεσσι with knowing mind, (Iliad by Homer)
2. with infinitive to know how to do, (Iliad by Homer), attic
3. with the participle to know that so and so is the case, ἴσθι μοι δώσων know that thou wilt give, (Aeschulus Tragicus); τὸν Μῆδον ἴσμεν ἐλθόντα (Thucydides)
4. οὐκ οἶδα εἰ, I know not whether, expresses disbelief, like Lat. nescio an non, οὐκ οἶδ᾽ ἂν εἰ πείσαιμι (Euripides)
5. οἶδα or ἴσθι are often parenthetic, οἶδ᾽ ἐγώ (Euripides); οἶδ᾽ ὅτι, οἶσθ᾽ ὅτι, ἴσθ᾽ ὅτι, πάρειμι (Sophocles Tragicus); so, εὖ οἶδ᾽ ὅτι (Demosthenes Orator): —;in [variant datesTragica Adespota also, οἶσθ᾽ ὃ δρᾶσο; equivalent to δρᾶσον —; οἶσθ᾽ ; do —; know'st thou what? i. e. make haste and do; οἶσθ᾽ ὡς ποίησον, etc. (ML)