The aim of this book is to present a new theory of argument structure alterna-tions, one which is anchored in the syntax but has systematic interfaces with thephonology and the semantics. Conceptually, my goal is to argue for a specificformal system. Empirically, my goal is to provide the most comprehensive de-scription and analysis of Hebrew verbal morphology to date, one whose formal assumptions are as similar as possible to those made in work on non-Semiticlanguages. Let’s first see why Hebrew is interesting (Section1.1) and then why itcontinues to challenge existing accounts (Section1.2), before outlining the cur-rent proposal, Trivalent Voice (Sections1.3–1.4).