YOU SAID:
why this world must spinning now.
INTO JAPANESE
なぜこの世界は今回転しなければならないのか。
BACK INTO ENGLISH
Why does this world have to rotate now?
INTO JAPANESE
なぜこの世界は今回転しなければならないのですか?
BACK INTO ENGLISH
Why does this world have to rotate now?
That didn't even make that much sense in English.