YOU SAID:

Youve done this before havent you?

INTO JAPANESE

あなたはあなたがいない前にこれをしましたか？

BACK INTO ENGLISH

Did you do this before you weren't there?

INTO JAPANESE

あなたがそこにいない前にあなたはこれをしましたか？

BACK INTO ENGLISH

Did you do this before you weren't there?