YOU SAID:
i was on a audition yesterday
INTO JAPANESE
私は昨日オーディションに参加していた
BACK INTO ENGLISH
I was in the audition yesterday.
INTO JAPANESE
私は昨日オーディションに参加していました。
BACK INTO ENGLISH
I was at the audition yesterday.
INTO JAPANESE
私は昨日そのオーディションにいた。
BACK INTO ENGLISH
I was at the audition yesterday.
Come on, you can do better than that.