This monograph is devoted to the previously not fully described in linguistics stratum of the language - particulars. The first paragraph of the book ("Some introductory considerations") emphasizes the fundamental difference between particulars and what is commonly called particles. The author identifies the reasons for the repulsion of traditional linguistics from this language stratum. The role of particulars in the formation of Indo-European paradigms is demonstrated. It is also shown that at earlier stages of existence, Slavic languages ​ ​ have significantly more coincidences.