YOU SAID:
You've done this before, didn't you.
INTO JAPANESE
あなたは前にこれをやったことがありますね。
BACK INTO ENGLISH
You've done this before, have you?
INTO JAPANESE
あなたは前にこれをやったことがありますね。
BACK INTO ENGLISH
You've done this before, have you?
That didn't even make that much sense in English.