YOU SAID:

You did this before, didn't you?

INTO JAPANESE

あなたは前にこれをしましたよね？

BACK INTO ENGLISH

Did you do this before?

INTO JAPANESE

前にこれをしましたか？

BACK INTO ENGLISH

Have you done this before?

INTO JAPANESE

前にやったことあるの？

BACK INTO ENGLISH

Have you done this before?