YOU SAID:
I have indeed done this before.
INTO JAPANESE
確かに以前にもこれをやったことがあります。
BACK INTO ENGLISH
I'm sure you've done this before.
INTO JAPANESE
きっと以前にもやったことがあると思います。
BACK INTO ENGLISH
I'm sure you've done it before.
INTO JAPANESE
きっと以前にもやったことがあると思います。
BACK INTO ENGLISH
I'm sure you've done it before.
You've done this before, haven't you.