Auxiliation and typological shift: The interaction of language contact and internally-motivated change in Quechua Daniel J. Hintz, SIL International Abstract This paper documents the formation of auxiliary verbs and suffixes in Quechua and examines how processes of language evolution and contact introduce new aspectual contrasts expressed through verbal periphrases. Quechuan languages provide an excellent opportunity to examine the interaction of internal and external motivations for change because the auxiliation process suggests sequences of regular developments and also provides evidence for changes induced by contact with Spanish. The creation of numerous auxiliaries, coupled with stimulation of their productivity, enlarges the role for grammatical expression through periphrasis. Additionally, the contact-induced obstruction of verbal suffix formation weakens the sustainability of polysynthesis via renewal. Although the initial effects are minor, these contact phenomena initiate a shift toward an increasingly analytic, less polysynthetic morphology. Keywords: auxiliary verb, language contact, typological shift, Quechua, Andean Spanish 1. Introduction Marianne Mithun, whose pioneering scholarship we celebrate in this volume, has contributed a number of insightful studies highlighting the interaction between contact and internally-motivated change in languages of native North America. Recent works on Iroquoian, Eskimoan, and languages of northern California and the Pacific northwest include Mithun 2004, 2005, 2007, 2012a, 2012b, 2012c, and 2012d. In these and other publications, she calls for continuing research on the interplay between language evolution and contact, emphasizing that: Further work on ways in which internal and external processes of change interact is crucial to our investigation of deeper genetic and areal relations and to an understanding of cross- linguistic typological profiles (2004:17). Accordingly, the present work takes us to native languages of western South America – the Quechua language family. These languages provide