Yes; without knowing them beforehand. I knew the plot of Turandot very imperfectly when I saw the opera, and (partially because we got to our seats literally as the lights went down and I had no chance to read through the synopsis included in the program) had no idea what riddles Turandot would ask, much less the answers. So I guessed two of them and was correct, and would probably not have gotten the third. That's all.