YOU SAID:
You've done this, have you not.
INTO JAPANESE
あなたはこれをしましたね。
BACK INTO ENGLISH
You did this
INTO JAPANESE
あなたはこれをしました
BACK INTO ENGLISH
you did this
INTO JAPANESE
あなたはこれをしました
BACK INTO ENGLISH
you did this
You've done this before, haven't you.