YOU SAID:
Matt is my bestfriend
INTO JAPANESE
マットは、私の親友
BACK INTO ENGLISH
Matt is my best friend.
INTO JAPANESE
マットは私の親友です。
BACK INTO ENGLISH
Matt is a good friend of mine.
INTO JAPANESE
マットは、私の良き友人です。
BACK INTO ENGLISH
Matt is a good friend of mine.
Okay, I get it, you like Translation Party.