Imperfect and verbs with prepositions in Attic

I would be really pleased if you could tell me what are the rules to follow when a preposition meets the ε of the imperfect’s temporal augment, as to what letter drop, when does it contract and so on?

Thanks a lot

Rodrigo

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I was wondering what the augment and reduplication is of words like απο-κατα-βαινω, which is made from two prepositions and a verb. Does it become απεκατεβην or αποκατεβην or απεκαταβην or somethings else? Thanks a lot!

GreekGeek 2

While there are a few, rare verbs where the preposition became so attached to the verb stem that it is augmented, in general only the verb stem can get the augment. So, ἀποκατέβην.