the article considers phraseological units (semantically close to a word), which can structurally correspond to such syntactic constructions as a whole sentence, a phrase (subordinating or coordinating) or a case-postpositional combination. Objective: to establish correlations of phraseological units with members of a sentence as part of syntactic constructions. Research materials: phraseological units extracted from bilingual Erzya-Russian and phraseological dictionaries; contexts with phraseological units from works of fiction by Mordovian authors in the Erzya language. Results and novelty of the research: for the first time in Mordovian linguistics, the article presents the correlation of members of a sentence and phraseological units on the material of the Erzya language. Using a system-functional approach 259 Bulletin of Ugric Studies. Vol. 14. № 2 (57). 2024. within the contextual analysis methodology, the main patterns of the syntactic functioning of phraseological units are analyzed. Phraseological units corresponding to a whole sentence, phrase or case-postpositional combination are fixed. It is indicated that a phraseological unit is fully revealed only in context, so identifying its syntactic functions becomes important. Analysis of theoretical and illustrative material allowed us to come to the conclusion that it can perform the function of all members of a sentence. To the least extent (even for a substantive phraseological unit), it has the function of a subject, since in its semantics it is most often a predicate word, but this allows it to often function as a predicate. As part of a sentence, a phraseological unit can be isolated from other members of the sentence, perform the function of a generalizing word, be included in a number of homogeneous members, create predicative parts in conjunctionless complex sentences, act as the main or subordinate part of a compound sentence
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