YOU SAID:

I ain't ever seen to pretty best friends

INTO JAPANESE

私はかなり親友に見たことがありません

BACK INTO ENGLISH

I haven't seen it to my best friend

INTO JAPANESE

親友には見たことがない

BACK INTO ENGLISH

Never seen by my best friend

INTO JAPANESE

私の親友には見たことがない

BACK INTO ENGLISH

Never seen by my best friend