This Book Presents A Synchronic Grammar Of The Southern Dialects Of Yauyos, An Extremely Endangered Quechuan Language Spoken In The Peruvian Andes. As The Language Is Highly Synthetic, The Grammar Focuses Principally On Morphology; A Longer Section Is Dedicated To The Language'S Unusual Evidential System. The Grammar'S 1400 Examples Are Drawn From A 24-Hour Corpus Of Transcribed Recordings Collected In The Course Of The Documentation Of The Language.