This exceptional book blends theoretical explanation and empirical evidence in a seamless web. It not only provides a uniquely new and precisely analyzed data set on Quechua-Spanish bilingualism, but also offers an elegant new theory on a source of language change. Its many discoveries and insights will surely recommend it to a wide audience, ranging across many subfields including Bilingualism, First and Second Language Acquisition, Language Contact and Linguistic Theory.

- Barbara Lust, Cornell University,

A very interesting study. It compares two communities, makes use of explicit elicitation techniques, and the theoretical analysis is very careful.

- Pieter Muysken, University of Nijmegen,

This work is a strong contribution to the fields of language contact and syntactic convergence. Although the scope of the book is clearly a syntactic analysis, this work is a useful tool for those interested in brushing up on certain aspects of either Spanish or Quechua grammar.

- Michael Shelton, The Pennsylvania State University on Linguist List 15.1975, 2004,