YOU SAID:
Goodbye everybody, I've got to go.
INTO JAPANESE
さようなら、みんな、もう行かなきゃ。
BACK INTO ENGLISH
Goodbye, everyone, I have to go now.
INTO JAPANESE
さようなら、皆さん、もう行かなければなりません。
BACK INTO ENGLISH
Goodbye, everyone, I have to go now.
That didn't even make that much sense in English.