[*] 794. οἶδα (ἰδ, εἰδ-ε, οἰδ- originally with ϝ; cp. Lat. video) know is a second perfect with the meaning of a present, and formed without reduplication. The second perfect and second pluperfect are inflected as follows:
SECOND PERFECT | SECOND PLUPERFECT | |||||
Indic. | Subj. | Opt. | Imper. | Indic. | ||
Sing. 1 οἶδα | εἰδῶ | εἰδείην | ᾔδη | or ᾔδειν | ||
2 οἶσθα | εἰδῇς | εἰδείης | ἴσθι | ᾔδησθα | or ᾔδεις | |
3 οἶδε | εἰδῇ | εἰδείη | ἴστω | ᾔδει(ν) | ||
Dual 2 ἴστον | εἰδῆτον | εἰδεῖτον | ἴστον | ᾖστον | ||
3 ἴστον | εἰδῆτον | εἰδείτην | ἴστων | ᾔστην | ||
Plur. 1 ἴσμεν | εἰδῶμεν | εἰδεῖμεν | or εἰδείημεν | ᾖσμεν | or ᾔδεμεν | |
2 ἴστε | εἰδῆτε | εἰδεῖτε | εἰδείητε | ἴστε | ᾖστε | ᾔδετε |
3 ἴσα_σι | εἰδῶσι | εἰδεῖεν | εἰδείησαν | ἴστων | ᾖσαν | ᾔδεσαν |