This book argues a fresh theory about the structure of tone. Bao investigates a wide range of tone sandhi data from various Chinese dialects and other Asian tone languages, providing empirical support for his proposal that tone is a formal entity which consists of register and contour. Bao establishes a clear typological distinction between register tone languages and contour tone languages whose contour tones have a more complex structure.

Charts the history of Singapore English and explores the linguistic, historical and social factors that have influenced its variety.