The synthetic structure or analytical structure of a language system presupposes typical limitations in its syntactic patterns, as a result of which are reproducted and lexical restrictions, which in turn each proposition in the language correlates with a range concrete, specific reference situation. This is proof of the strength and consistency of syntactic interference between the Bulgarian and Russian language.
This study is underlying assumptions interference syntax errors in acquiring Bulgarian types of compound sentences by native Russians.
Keywords: syntactic interference, language systems, interference errors, sustainable interference phenomenon, conjunctions.

