I was studying Ephesians 5:21 and doing a word study on "submit" (Ὑποτασσόμενοι). (OK, I don't want to start a theological debate here: which is painful in itself. I just want to focus on the Greek grammar.)
The word is tagged as a passive voice verb on Logos Greek Morphology. When I looked at various commentaries, they all agree it is a middle voice verb. When I looked at my Greek grammar, they also say you cannot tell whether a verb is passive or middle voice based on its spelling and you need to look at the context.
My question: is there any other Greek morphology I can use? How reliable is Logos Greek morphology in other instances? Any other similar issues in other passages?