Erich R. Round
The non–Pama-Nyugan, Tangkic languages were spoken until recently in the southern Gulf of Carpentaria, Australia. The most extensively documented are Lardil, Kayardild, and Yukulta. Their phonology is notable for its opaque, word-final deletion rules and extensive word-internal sandhi processes. The morphology contains complex relationships between sets of forms and sets of functions, due in part to major historical refunctionalizations, which have converted case markers into markers of tense and complementization and verbal suffixes into case markers. Syntactic constituency is often marked by inflectional concord, resulting frequently in affix stacking. Yukulta in particular possesses a rich set of inflection-marking possibilities for core arguments, including detransitivized configurations and an inverse system. These relate in interesting ways historically to argument marking in Lardil and Kayardild. Subordinate clauses are marked for tense across most constituents other than the subject, and such tense marking is also found in main clauses in Lardil and Kayardild, which have lost the agreement and tense-marking second-position clitic of Yukulta. Under specific conditions of co-reference between matrix and subordinate arguments, and under certain discourse conditions, clauses may be marked, on all or almost all words, by complementization markers, in addition to inflection for case and tense.
In the linguistic literature, the term theme has several interpretations, one of which relates to discourse analysis and two others to sentence structure. In a more general (or global) sense, one may speak about the theme or topic (or topics) of a text (or discourse), that is, to analyze relations going beyond the sentence boundary and try to identify some characteristic subject(s) for the text (discourse) as a whole. This analysis is mostly a matter of the domain of information retrieval and only partially takes into account linguistically based considerations. The main linguistically based usage of the term theme concerns relations within the sentence. Theme is understood to be one of the (syntactico-) semantic relations and is used as the label of one of the arguments of the verb; the whole network of these relations is called thematic relations or roles (or, in the terminology of Chomskyan generative theory, theta roles and theta grids). Alternatively, from the point of view of the communicative function of the language reflected in the information structure of the sentence, the theme (or topic) of a sentence is distinguished from the rest of it (rheme, or focus, as the case may be) and attention is paid to the semantic consequences of the dichotomy (especially in relation to presuppositions and negation) and its realization (morphological, syntactic, prosodic) in the surface shape of the sentence. In some approaches to morphosyntactic analysis the term theme is also used referring to the part of the word to which inflections are added, especially composed of the root and an added vowel.
Throughout the 20th century, structuralist and generative linguists have argued that the study of the language system (langue, competence) must be separated from the study of language use (parole, performance), but this view of language has been called into question by usage-based linguists who have argued that the structure and organization of a speaker’s linguistic knowledge is the product of language use or performance. On this account, language is seen as a dynamic system of fluid categories and flexible constraints that are constantly restructured and reorganized under the pressure of domain-general cognitive processes that are not only involved in the use of language but also in other cognitive phenomena such as vision and (joint) attention. The general goal of usage-based linguistics is to develop a framework for the analysis of the emergence of linguistic structure and meaning.
In order to understand the dynamics of the language system, usage-based linguists study how languages evolve, both in history and language acquisition. One aspect that plays an important role in this approach is frequency of occurrence. As frequency strengthens the representation of linguistic elements in memory, it facilitates the activation and processing of words, categories, and constructions, which in turn can have long-lasting effects on the development and organization of the linguistic system. A second aspect that has been very prominent in the usage-based study of grammar concerns the relationship between lexical and structural knowledge. Since abstract representations of linguistic structure are derived from language users’ experience with concrete linguistic tokens, grammatical patterns are generally associated with particular lexical expressions.