One of the key trends in modem functional syntax is semantic one aiming to redirect linguistic research according to the principle „from content to form”. The topicality of the proposed study is grounded on the need for a multidirectional investigation of correlations of secondary prepositions which are constituents of temporal prepositional-nominal structures with semantics of approximate and intermediate time as projected to the sentence as a multi-level syntactic unit. The author also elucidates systematic correlations of temporal prepositions derivatives in accordance with their modem scientific research. The article focuses on the formal structure of prepositional- substantive temporatives with the obligatory consideration of genetic c...