About Studying Complicated Sentences in Russian as a Foreign Language Classes Summary The article discusses sentences, complicated by isolated of minors members, in the classroom on Russian as a foreign language. Isolated minors members are relatively independent in the sentence and are characterized by intonation emphasis. In most cases, isolated minor members enter into a semi-predicative attitude with the basic of the sentence or with any of its members. An important prerequisite for isolation is the absence of a close syntactic connection between the word form and it’s definable. For this reason, predominantly freely attaching determinants, agreed and adjoining nominal word forms are isolated. The semi-predicative function can be harmonized and non-harmonized definitions, as well as sentences related to personal pronouns. The study of complicated sentences contributes to the development of oral and written speech of Azerbaijani students. Key words: Russian as a foreign language, complicated sentence, separation, semi-predicativeness