YOU SAID:
My mom is your very best friend and you are not it.
INTO JAPANESE
私の母はあなたの親友、あなたはそれではないです。
BACK INTO ENGLISH
My mother is your best friend, you are it is not.
INTO JAPANESE
私の母はあなたの親友、あなたはそれではないです。
BACK INTO ENGLISH
My mother is your best friend, you are it is not.
That didn't even make that much sense in English.