The article analyzes the grammatical systematicity of models of request expression in modern Russian language. The relevance is determined by the need to identify the grammatical systematicity of the use of syntactic models of different types in expressing a request in Russian speech practice. The aim of the paper is to study syntactic models of request expression in modern Russian language in the aspect of the theory of communicative-pragmatic complexes. The study is conducted on the material representing different contexts of request usage: samples from modern Russian plays by famous playwrighters – A. Vampilov, N. Lakutin, E. Shabalina and A. Yablonskaya, as well as samples from the National Corpus of the Russian Language (NCLR) are used. Research methods: systematic, comparative, functional, contextual, structural-grammatical. Special attention is paid to the phenomenon of systematicity of syntactic models. The peculiarity of expressing the request by the models of sentences on the purpose of utterance – inductive, interrogative and narrative – is shown. The authors come to the conclusion about the peculiarity of linguistic conceptualization of request in three communicative situations – everyday request, official request, request when communicating in an unfamiliar environment, which differ in their communicative role and situations of use. The regularities of use of three types of sentences on the purpose of utterance depending on communicative situations are established. It is shown that the model of inductive sentences serves as the basic and most common grammatical form of expressing a request and is usually used in the communicative situation of a household request. Due to its special communicative characteristics, this model can also be used in the situation of communication with strangers, and with the use of grammatical extensions - and in some situations of official communication. The second most frequent type - interrogative sentences - is usually used when addressing strangers; as a rule, it is accompanied by politeness markers. Models of narrative sentences are used much less frequently than sentences of the other two types; they are most often used in situations of official communication.