I just started getting questions that require me to answer in pinyin, but nowhere along the way did I get any lessons in what it is or how I'm supposed to answer. I also do not understand the explanation of something like OLD = LAO3. What is the 3? I was cranking along doing quite well I thought, then I ran into this and have hit a wall as there was no tutorial covering this piece. I searched thru this forum as well looking for every post with pinyin and while I have a better understanding of what it is now, I still don't know how to use it. Thanks!