Could someone help me with the conjugation of ανατρέφω?
All I need is the Greek
I think that would be impossible in Ancient Greek to have two aspirated stops next to each other (which is where alternations such as θάβω / τάφηκα - τρέφω / έθρεψα - τίθεται / τέθηκε / έθεσε come from).
Has Modern Greek backformed a present tense stem αναθρεφ- from the aorist stem αναθρεψ-?
As a Greek speaker I prefer ανατρέφω more than αναθρέφω, even they are both right. For reason of euphony, the position of the tongue in these two phonemes φ and θ are a bit close each other and they are one after another in this word, so difficult to say. Some kids learn difficult to discriminate them and need a specialist speech therapist to teach how to spell them. It is the last phonemes they learn in speech and some never learn. This is the explanation I give to myself for the above choice. I googled a little about and yes, there are a scientific reasons for it. For documentation take a look at this in Greek: http://apothetirio.teiep.gr/xmlui/bitstream/handle/123456789/662/lgt_2013035.pdf?sequence=1