The noun-modifying clause construction (NMCC) in Japanese is a complex noun phrase in which a prenominal clause is dependent on the head noun. Naturally occurring instances of the construction demonstrate that a single structure, schematized as [[… predicate (finite/adnominal)] Noun], represents a wide range of semantic relations between the head noun and the dependent clause, encompassing some that would be expressed by structurally distinct constructions such as relative clauses, noun complement clauses, and other types of complex noun phrases in other languages, such as English. In that way, the Japanese NMCC demonstrates a clear case of the general noun-modifying construction (GNMCC), that is, an NMCC that has structural uniformity across interpretations that extend beyond the range of relative clauses.
One of the notable properties of the Japanese NMCC is that the modifying clause may consist only of the predicate, reflecting the fact that referential density is moderate in Japanese—arguments of a predicate are not required to be overtly expressed either in the main clause or in the modifying clause. Another property of the Japanese NMCC is that there is no explicit marking in the construction that indicates the grammatical or semantic relation between the head noun and the modifying clause. The two major constituents are simply juxtaposed to each other.
Successful construal of the intended interpretations of instances of such a construction, in the absence of explicit markings, likely relies on an aggregate of structural, semantic, and pragmatic factors, including the semantic content of the linguistic elements, verb valence information, and the interpreter’s real-world knowledge, in addition to the basic structural information.
Researchers with different theoretical approaches have studied Japanese NMCCs or subsets thereof. Syntactic approaches, inspired by generative grammar, have focused mostly on relative clauses and aimed to identify universally recognized syntactic principles. Studies that take the descriptive approach have focused on detailed descriptions and the classification of a wide spectrum of naturally occurring instances of the construction in Japanese. The third and most recent group of studies has emphasized the importance of semantics and pragmatics in accounting for a wide variety of naturally occurring instances.
The examination of Japanese NMCCs provides information about the nature of clausal noun modification and affords insights into languages beyond Japanese, as similar phenomena have reportedly been observed crosslinguistically to varying degrees.
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.