This article is about mathematical models which allow automatically transforming the class of Tajik words with the complex structure (inflexional forms) into the fragments of sentences in Tajik, Russian and English languages. Received fragments of Tajik sentences consist of the words witch have a simple structure (analytical form). This permits to simplify translation of these fragments into languages with analytical structure, particularly in English language. Russian language is used as the meta-language (intermediate auxiliary language), and mainly for commenting.