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Theories of argument realization typically associate verbs with an argument structure and provide algorithms for the mapping of argument structure to morphosyntactic realization. A major challenge to such theories comes from the fact that most verbs have more than one option for argument realization. Sometimes a particular range of realization options for a verb is systematic in that it is consistently available to a relatively well-defined class of verbs; it is then considered to be one of a set of recognized argument alternations . Often—but not always—these argument alternations are associated morphological marking. An examination of cross-linguistic patterns of morphology associated with the causative alternation and the dative alternation reveals that the alternation is not directly encoded in the morphology. For both alternations, understanding the morphological patterns requires an understanding of the interaction between the semantics of the verb and the construction the verb is integrated into. Strikingly, similar interactions between the verb and the construction are found in languages that do not mark the alternations morphologically, and the patterns of morphological marking in morphologically rich languages can shed light on the appropriate analysis of the alternations in languages that do not mark the alternations morphologically.

The Causative/Inchoative alternation involves pairs of verbs, one of which is causative and the other non-causative syntactically and semantically (e.g., John broke the window vs. The window broke). In its causative use, an alternating verb is used transitively and understood as externally caused. When used non-causatively, the verb is intransitive and interpreted as spontaneous. The alternation typically exhibits an affected argument (i.e., a Theme) in both intransitive and transitive uses, whereas the transitive use also involves a Causer that brings about the event. Although they are often volitional agents (e.g., John broke the window with a stone), external causers may also be non-volitional causers (e.g., The earthquake broke the windows) and instruments (e.g., The hammer broke the window). Morphologically, languages exhibit different patterns reflecting the alternation, even intralinguistically. In languages like English, alternations are not morphologically coded, but they are in most languages. Languages like Hindi commonly mark causative (or transitive) alternations by means of different mechanisms, such as internal vowel changes or causative morphology. In many European languages, a subset of alternating verbs may exhibit an uncoded alternation, but most alternating verbs mark anticausativization with a reflexive-like clitic. In Yaqui (Uto-Aztecan), different patterns are associated with different verbal roots. The alternation may be uncoded, equipollent (i.e., both alternating forms are coded), and anticausative. Theoretically, different approaches have explored the alternation. Both lexical and syntactic causativization and anticausativization accounts have been proposed to explain the alternation. A third approach postulates that both forms are derived from a common source.

Words are sensitive to syntactic context. Argument realization is the study of the relation between argument-taking words, the syntactic contexts they appear in and the interpretive properties that constrain the relation between them.