This dissertation is an investigation into compound verbal structures in Hiaki in which a verb of motion is modified by an adjoined lexical verb or verb phrase. It provides the first in-depth documentation and analysis of this structure in Hiaki, an endangered language indigenous to North America, and it explores the extent to which complex predicates of motion may be said to form a discrete class crosslinguistically, either in structural or semantic terms, by comparing Hiaki with genetically and typologically distinct languages such as Korean and Warlpiri. The study asks the following questions: 1) What is the underlying structure of a Hiaki compound verb? In particular, what is the structure when the head verb is intransitive and thus cannot take the second verb or verb phrase as its complement? 2) To what extent can complex motion predicates in different languages be said to map to identical underlying syntactic structures? That is, if we compare these constructions in Hiaki with those in languages with different surface morphosyntactic realizations, how do the allowable surface forms constrain the possible underlying structures? 3) Is there evidence to suggest a cline or typology of complex motion predicate constructions? The overall goals of the dissertation project are the detailed documentation, description and theoretical analysis of complex motion constructions in Hiaki, the crosslinguistic comparison of these constructions, and the expansion of an existing database of transcribed and interlinearized Hiaki texts.

This dissertation explores the mechanisms behind the linguistic expression of causation in English, Hiaki (Uto-Aztecan) and Spanish. Pylkkänen's (2002, 2008) analysis of causatives as dependent on the parameterization of the functional head v(CAUSE) is chosen as a point of departure. The studies conducted in this dissertation confirm Pylkkänen's claim that all causatives involve the presence of vCAUSE. They further confirm that variation is conditioned by both the selectional and 'Voice-bundling' properties of the causative head. I show that this pattern triggers differences across languages, although other factors are also responsible for the existence of multiple causative configurations within languages. In some languages (e.g. English), causatives require the obligatory presence of an external argument (i.e., Causer). I provide additional data supporting Pylkkänen's proposal that causation (in certain languages) may also exist in the absence of a syntactic Causer. In particular, I offer data from Hiaki indirect causatives and Spanish desiderative causatives (e.g., .Te hace salir? '2sg.dat (expl)makes go.out, Do you feel like going out?’), and weather/temporal constructions (e.g., Hace mucho calor '(expl) makes much heat, It’s very hot') in support of this hypothesis. The results of this research, however, question Pylkkänen's claim that certain languages may allow the Root-causativization of transitives and unergatives. I show that this is not possible even in languages that exhibit Causer-less causatives (e.g., Hiaki). Moreover, certain unaccusatives (e.g., arrive) also resist (Root) causativization crosslinguistically, regardless of the 'Voice-bundling' properties inherent to the causativizing head. I claim that this happens in contexts in which unaccusative verbs exhibit 'unergative' behavior (i.e., whenever they involve syntactic elements that are base-generated in positions higher than the root). Cross-linguistic variation in the expression of causation is not always a direct consequence of the internal properties of the causative predicate. Because of language-internal requirements, different languages impose specific limitations on the syntactic realization of causative structures. For instance, English and Spanish heavily rely on Agreement relations among their constituents. The consequence of this is that it is difficult in these languages to discern what elements really are part of causation and what elements are not, as well as the nature of the elements involved in causatives (e.g., whether the dative in Spanish productive causatives is an external argument or an applicative). This dissertation addresses all these questions.

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