YOU SAID:
Why is the sky blue rather than black
INTO JAPANESE
なぜ、黒ではなく、空の青
BACK INTO ENGLISH
Why a black, not blue sky
INTO JAPANESE
なぜ黒、青ではない空
BACK INTO ENGLISH
Why not black and blue sky
INTO JAPANESE
なぜない黒と青の空
BACK INTO ENGLISH
Why not black and blue sky
That didn't even make that much sense in English.