YOU SAID:
I once had a friend who later became my enemy.
INTO JAPANESE
私はかつて私の敵になった友人がいました。
BACK INTO ENGLISH
I once had a friend who became my enemy.
INTO JAPANESE
私はかつて私の敵になった友人がいました。
BACK INTO ENGLISH
I once had a friend who became my enemy.
You've done this before, haven't you.