Aorist Indicative  became Who? perished, died ἐγεν όμην I ἀπ ωλ όμην ἐγέν ου you (sg) ἀπ ώλ ου ἐγέν ετο  he, she, it   ἀπ ώλ ετο ἐγεν όμεθα we ἀπ ωλ όμεθα ἐγέν εσθε you (pl) ἀπ ώλ εσθε ἐγέν οντο they ἀπ ώλ οντο   I left a gap between the prefix ἀπ- and the verb-stem ὤλ- to show why we have an ὢ μέγα in the aorist indicative forms (temporal augment), but a normal ὂ μικρόν in all the other forms. The 2nd person singular ending should of course be -εσο but for some reason in endings an σ between 2 vowels often gets dropped, and since εο usually contracts to ου, 2nd person: "you perished" becomes ἀπώλου just like 2nd person: "you became" is ἐγένου    Aorist Imperative  become!     perish! γεν οῦ you (sg) ἀπ ολ οῦ γεν έσθω let him ἀπ ολ έσθω γέν εσθε  you (pl)   ἀπ όλ εσθε γεν έσθων let them ἀπ ολ έσθων   2nd person singular should of course be γενέσο and ἀπολέσο! But, as before, after the thematic vowel ε the -σ- of the personal ending vowel σο disappears, leaving έο which, as usual, contracts to οῦ    Aorist Infinitive  to become     to die or perish γεν έσθαι     ἀπ ολ έσθαι    Aorist Participle  having become     having perished γεν όμενος, -η, -ον     ἀπ ολ όμενος, -η, -ον