1. From possession to obligation: modal grammaticalization and variation Open Access Author: Bauman, Joseph Robert Title: From possession to obligation: modal grammaticalization and variation Graduate Program: Spanish Keywords: Language changelanguage variationgrammaticalizationSpanishlinguisticshistorical linguistics File: Download Joseph_Bauman_Dissertation_7_1_2013.pdf Committee Members: Rena Torres Cacoullos, Dissertation Advisor/Co-AdvisorJohn Lipski, Committee MemberPhilip Baldi, Committee MemberBarry Richard Page Jr., Committee Member