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.