YOU SAID:
Have you dont this one yet?
INTO JAPANESE
まだこれを持ってないのか?
BACK INTO ENGLISH
You still don't have this?
INTO JAPANESE
まだ持ってないの?
BACK INTO ENGLISH
You don't have it yet?
INTO JAPANESE
まだ持ってないの?
BACK INTO ENGLISH
You don't have it yet?
That didn't even make that much sense in English.