Вторинні функції словоформ орудного відмінка в конструкціях із другоряднопредикативними відношеннями

The article proves that the case form with secondary-predicative meaning in the structure of simple complicated sentence is characterized by special conditions of use; it performs its secondary function. Specifically, syntaxeme in instrumental case causes not only closer definition of grammar means of expression of new semantic-syntactical relations, but also the appearance of new types of syntactical connection.