YOU SAID:
today is a beautiful day aint it?
INTO JAPANESE
今日は素晴らしい日ですね?
BACK INTO ENGLISH
Isn't today a wonderful day?
INTO JAPANESE
今日は素晴らしい日ではないでしょうか?
BACK INTO ENGLISH
Isn't today a wonderful day?
That didn't even make that much sense in English.