YOU SAID:
No, I havent done this before
INTO JAPANESE
いいえ、これは以前に行ったことがありません
BACK INTO ENGLISH
No, this has never been done before
INTO JAPANESE
いいえ、これはこれまでに行われたことがありません
BACK INTO ENGLISH
No, this has never been done
INTO JAPANESE
いいえ、これは行われたことがありません
BACK INTO ENGLISH
No, this has never been done
You've done this before, haven't you.