The authors of the collective monograph address seemingly long-resolved questions about the types of communication within a complex sentence. New data was obtained thanks to the study of such "connectors" as particles, intonation of non-union, word order, highlighting the topic and remas, etc. Certain rules were revealed when distinguishing, albeit, habitually considered options. A special place in the book is occupied by the identification of the "hidden semantics" of the Russian pronoun I, which, as it turned out, leads the researcher to distant Indo-European depths, to a complex composite construction, which determines the use of I in the Russian language, which has preserved this hidden category.