YOU SAID:
My friend's in there.
INTO JAPANESE
私の友人はそこに。
BACK INTO ENGLISH
My friends are there.
INTO JAPANESE
私の友人があります。
BACK INTO ENGLISH
A friend of mine.
INTO JAPANESE
私の友人。
BACK INTO ENGLISH
17639:my friend
INTO JAPANESE
私の友人
BACK INTO ENGLISH
17639:my friend
That didn't even make that much sense in English.