Apparently, this user prefers to keep an air of mystery about them.
9 Why were some letters like Q, X, C, chosen for Pinyin which confuse non-Chinese speakers? Dec 26 '11
6 When do the tones change? Dec 27 '11
4 How to convert from hanyu pinyin to IPA? Dec 27 '11
1 What comprehensive grammar books are available? Dec 27 '11