YOU SAID:

My friends are the friendliest friends

INTO JAPANESE

私の友達は最もフレンドリーな友達です

BACK INTO ENGLISH

my friend is the friendliest friend

INTO JAPANESE

私の友達は一番優しい友達です

BACK INTO ENGLISH

my friend is the best friend

INTO JAPANESE

私の友達は最高の友達です

BACK INTO ENGLISH

my friend is the best friend