The article under consideration throws light upon the problem of the dynamism of grammar. The article explains the role of the term “grammar” in linguistics. The spectrum and development of theoretical concepts and ideas for constructing a structural model of grammar are analyzed as a categorical system. It has been proved that the dynamism of the notion of grammar lies in the fact of constant development; forms and types of grammar are determined. This article outlines the main objectives of functional grammar, functional analysis approaches used in American and European linguistics in terms of the potential theoretical basis for creating functional grammar and defines an optimal functional grammatical theory of the formation of the functional grammar Ukrainian language.