Book excerpt: This is the first grammar in English of Khatso, an endangered language spoken in a single farming village in China by descendants of Kublai Khan’s Mongol soldiers. Based on natural language from dozens of speakers, this analysis captures the way Khatso is spoken in daily life. As a result, it is the most comprehensive description of Khatso yet, providing an in-depth look at the features, structures and systems that comprise this unique language.