1 Origin and Theoretical Background

The origin and theoretical background of the St. Petersburg Functional Grammar School are elaborated in detail. In the 1970s, Bondarko founded this school, whose theoretical proposition advocates a descriptive method from semantics to formal means, emphasizing the speaker's selection of expressive forms starting from semantics. This theory, based on Maslov's research on verbal aspect, introduced the concept of the "functional-semantic field," integrating vocabulary and grammar into a single model. The center-periphery concept of the functional-semantic field model draws from the research of the Prague Linguistic Circle. Furthermore, the school proposed the concept of "categorial situations" to analyze the role of each element within the functional-semantic field in specific utterances. Functional grammar theory both inherits the classical linguistic tradition and anticipates the development of modern linguistic theories. Within half a century, the school has published a large number of works, promoted the development of functional grammar theory, and attracted many scholars to participate in related research.

2 Historical Achievements and Theoretical Contributions

The six-volume monograph The Theory of Functional Grammar is a major achievement of the St. Petersburg Functional Grammar School. The work provides detailed descriptions of functional-semantic fields in Russian and other languages, covering various semantic field types such as aspect, temporality, modality, etc., and notes that these collections of semantic categories are not closed, as the same linguistic means can belong to different functional-semantic fields. The school's functional grammar model is based on natural classification, characterized by complexity and flexibility, corresponding to the complexity of language as a living system, and is easily integrable with other functional schools. Functionalism, as a theoretical school opposed to formalism, features typological orientation, an empirical view, the use of quantitative methods, and interdisciplinary approaches. The school's collection of spontaneous speech data in language acquisition research exemplifies this. Opposed to structuralism, the school is dedicated to revealing the characteristics of linguistic structures through their functions, offering different interpretations of the term "function," treating semantic function as one of the main objects of analysis in its functional grammar model, and attempting to categorize linguistic semantics. Worldwide, there are several functional grammar schools that adopt common principles to describe linguistic phenomena but employ different methods when analyzing data. The theoretical framework of the St. Petersburg Functional Grammar School is more suitable for analyzing languages with rich morphological systems. Its first collective monographs constructed a comprehensive model for describing the linguistic system based on the morphological categories of the Russian verb. In the late 1980s, the school pioneered extensive cross-linguistic comparative studies. The depth and breadth of its ideas are comparable to the "Cologne Project on Language Universals" led by Seiler, though their research focuses differ. During the writing of the The Theory of Functional Grammar series, linguists, while approaching from different theoretical perspectives, unanimously agreed on the basic concepts of functional-semantic field and categorial situation theory, including the "shuttle principle," adopting field concepts to study the grammatical system, and considering the interrelationships between the linguistic system and context. Many scholars participated in writing the series, contributing significantly to the successful publication of the six volumes. The Problems of Functional Grammar series represents the school's major research achievements in the 21st century, focusing on specific theoretical issues in grammatical description, such as the functions of morphological and syntactic categories in discourse and text. This series not only studies Russian from a synchronic perspective but also incorporates historical and ontogenetic viewpoints, analyzing various data types, including predicate categories in languages like Russian, French, and Evenki. Many scholars continue to delve into topics related to functional grammar theory, publishing individual monographs and series. As the functional grammar theoretical system continues to develop, the teaching activities of the school's representatives in universities have become increasingly active. St. Petersburg State University and Novosibirsk State Pedagogical University offer courses in functional grammar. Scholars like Bondarko and Voeikova have taught functional grammar courses at numerous universities domestically and abroad, promoting the widespread application of functional grammar principles and methods in the practical teaching of Russian as a foreign language.

3 New Horizons and Trends in Development

In the late 1990s, the St. Petersburg Functional Grammar School entered a new phase of development. The inclusion of researchers in language acquisition provided ecological data—namely child language data—for testing the functional grammar model. Research requires longitudinal observation of the development of various components of children's communicative competence and documentation of individual idiolect formation through diaries, audio/video recordings of dialogues, etc. Its prospects are closely linked to international interest in the acquisition of morphologically rich inflecting languages. Since 2000, collective monographs by the school have begun including chapters on child language acquisition. Numerous scholars have conducted in-depth analyses of the acquisition of semantic categories, case semantics, gender semantics, etc., exploring issues such as the categorization of response functions and the development of textual relations. In 2007, Tseitlin edited the book Semantic Categories in Child Speech, which described in detail the formation process of functional-semantic fields and examined question types and derivational phenomena in adult-child dialogues. Based on domestic and international psycholinguistic literature and the school's own achievements, researchers employed a "meaning-to-form" approach to describe child speech, focusing on the influence of language input on the construction of the child's native language system. They analyzed maternal response strategies during vocabulary acquisition and the pragmatic and structural features of adult communicative strategies, particularly in responses and recasts. In recent years, school members have collected data from various languages, conducting comparative descriptions of the ontogeny of grammatical categories, word-formation derivation processes, and the mechanisms of input influence. Following the rules of the international Child Language Data Exchange System (CHILDES), they have created corpora and applied quantitative analysis methods. Voeikova and Kazakovskaya focus on the speech of children from low socioeconomic status families. Kazakovskaya and Krasnoshekova study the speech of children with developmental delays or speech disorders, their findings becoming new subjects of interest in global language acquisition research. Furthermore, the age range of data samples is continually expanding, with the formation processes of certain language categories appearing in late ontogenetic materials. Infant-directed speech and the speech of male key caregivers have also received attention. Research on native language grammar acquisition considers children's cognitive development and social environment characteristics, constituting interdisciplinary and multidisciplinary studies. Rusakova employs psycholinguistic methods for experimental research. Voeikova and Kazakovskaya participate in international cross-linguistic projects, resulting in several collective monographs. Leading figures of the school frequently give lectures and series of courses, sharing new findings in the field of language acquisition.

4 Conclusion

The development achievements and influence of the St. Petersburg Functional Grammar School are summarized. The school unifies linguistic means and functions through the functional-semantic field, with categorial situation theory revealing semantic situations in speech, forming a holistic and systematic research paradigm. Its theoretical outcomes have enriched language acquisition research and aided in discovering linguistic universals and peculiarities. Chinese scholars have conducted in-depth studies of this school, pointing out its theoretical limitations while suggesting its potential utility for functional grammar research in Chinese. The functional-semantic field theory integrates multiple disciplines and leverages various technical means, which will promote multidimensional interpretation of linguistic phenomena and objective, detailed research on language evolution patterns and the nature of individual language competence.