when will you return?
when will you return as in a person coming back from somewhere
Your statement/question is unclear. Are you asking how to translate this?
Why don't you give it a try and then someone will help you.
? Cuándo te volverás ? Or may just ?Cuándo volverás?
Lazarus wrote an interesting discussion in the Reference section contrasting what the simple future tense implies .vs. the ir + a + infinitive periphrasis in expressing the future.
You might be interested in reading the nuance difference between:
¿Cuándo te volverás? [¿Cuándo volverás?]
¿Cuándo vas a volverte?
¿Cuándo usted va a regresar? or in tu form ¿cuándo vas a regresar? mean when are you going to return? Regards Ken.
If you're totally blank, then enter it into the machine translator to get a starting point.
Try refining its answer on your own (we're not supposed to proofread machine translations).
After you've done your best at polishing it, post it here and we'll make suggestions to further refine it, if necessary.
I tried it and, at least in this case, it gives you a comprehensible starting point which isn't always the case.