# how is it that you are turning back to ... principles?

"why are you paying attention again to ... principles?" or  "you should not be concerned  again with ... principles." 

# elemental principles

See how you translated this phrase in Galatians 4:3.

# Do you want to be enslaved all over again?

This rebuke can be translated as a sentence. Alternate translation: "It seems that you want to be slaves again." or "You behave as though you wanted to be like slaves again."