28.14 There are not many athematic second aorists. Only two are commonly encountered:
βαίνω, βήσομαι, ἔβην (verb stem: βη-) walk, come, go
γιγνώσκω, γνώσομαι, ἔγνων (verb stem: γνω-) know, learn, think
Note that these verbs expand their stems in the present active forms, and are middle in the future tense.
(cf. S 682)
Charts JPG