YOU SAID:
Mommy is my only best friend.
INTO JAPANESE
ママは私の唯一の親友です。
BACK INTO ENGLISH
MOM is my only friend.
INTO JAPANESE
お母さんは私の唯一の友人です。
BACK INTO ENGLISH
My mom is my only friend.
INTO JAPANESE
私の母は私の唯一の友人です。
BACK INTO ENGLISH
My mother is my only friend.
INTO JAPANESE
私の母は私の唯一の友人です。
BACK INTO ENGLISH
My mother is my only friend.
That didn't even make that much sense in English.