YOU SAID:
Money is my best friend
INTO JAPANESE
お金は私の親友
BACK INTO ENGLISH
Money is my best friend.
INTO JAPANESE
お金は私の親友です。
BACK INTO ENGLISH
Money is a good friend of mine.
INTO JAPANESE
お金は私の親友です。
BACK INTO ENGLISH
Money is a good friend of mine.
That didn't even make that much sense in English.