The relevance of 325 the investigation is predetermined by a general tendency of modern linguistic studies towards the proble- ms of semantic syntax and by the attempt to elaborate a semantic theory of a sentence with regard to the central place of syntax in grammar, asymmetry of a language sign, deep categories of sen- sentence.Aim of investigation.The article describes the phenom- en of syntactic complication of a simple sentence structure by semipre- dicative adjectival components (traditionally known as detached parti- ciple and verbal adverb phrases) with the inherent potential predica- tiveness.The following methods are used in the article: structural, semantic, distributive, transformational and functional analyses of simple sentences with adjectival components as units that are monop- monopredicative (a formally-syntactic feature), poly-situational, poly- propositional, poly-predicative, mono- / poly-subjective (semantic- syntactical features), poly-informative and are formed according to the law of language economy (a functional feature).The scientific novelty of the research results consists in the definition of SAC based on its formally-grammatical, Book Cover semantic-syntactical and functional features; the determination of outer syntagmatic efficiency of the adjective in the structure of a simple complicated sentence; the establishment of basic types of realization of semantic-syntactical relations between primary and secondary propositions; the highlighting of models that underline valency potential of adjectives within the limits of a semip- semipredicative construction, and also their distribution through valen- valency-not-predefined components.
Conclusions and generalizations of the research complement the grammatical description of simple and complicated sentences in the belles-lettres style of literary Ukrainian; they enrich studies about secondary predication and semip- semipredicativeness as relevant categories of simple (monopredicative) poly-propositional sentences.