In linguistics, syntax ( SIN-taks) is the study of how words and morphemes combine to form well-formed larger units such as phrases and sentences. Central concerns in this area of linguistics include word order, grammatical relations, hierarchical sentence structure (constituency), agreement, cross-linguistic variation, and the relationship between form and meaning (semantics). Diverse approaches, such as generative grammar and functional grammar, offer unique perspectives on syntax, reflecting its complexity and centrality to understanding human language. In logic, syntax is the study of how strings of symbols form well-formed formulas in formal languages.
Etymology The word syntax comes from the ancient Greek word σύνταξις, meaning an orderly or systematic arrangement, which consists of σύν- (syn-, "together" or "alike"), and τάξις (táxis, "arrangement"). In Hellenistic Greek, this also specifically developed a use referring to the grammatical order of words, with a slightly altered spelling: συντάσσειν. The English term, which first appeared in 1548, is partly borrowed from Latin (syntaxis) and Greek, though the Latin term developed from Greek.
Topics The field of syntax has a number of topics that a syntactic theory is designed to explain. The relation between the topics is treated differently in different theories, and some of them may not be considered to be distinct but instead to be derived from one another (e.g., word order can be seen as the result of movement rules derived from grammatical relations).
Sequencing of subject, verb, and object
One basic description of a language's syntax is the sequence in which the subject (S), verb (V), and object (O) usually appear in sentences. Over 85% of languages usually place the subject first, either in the sequence SVO or the sequence SOV. The other possible sequences are VSO, VOS, OVS, and OSV, the last three of which are rare. Some languages have no dominant order for these three sentence elements. In most generative theories of syntax, these surface differences arise from a complex clausal phrase structure, and each order may be compatible with multiple derivations. Word order can also reflect the semantics or function of the ordered elements.
Grammatical relations Another description of a language considers the set of possible grammatical relations in a language or in general and how they behave in relation to one another in the morphosyntactic alignment of the language. The description of grammatical relations can also reflect transitivity, passivization, and head-dependent-marking or other agreement. Languages have different criteria for grammatical relations. For example, subjecthood criteria may have implications for how the subject is referred to from a relative clause or coreferential with an element in an infinite clause.
Constituency Constituency is the feature of being a constituent and how words can work together to form a constituent (or phrase). Constituents are often moved as units, and the constituent can be the domain of agreement. Some languages allow discontinuous phrases in which words belonging to the same constituent are not immediately adjacent but are broken up by other constituents. Constituents may be recursive, as they may consist of other constituents, potentially of the same type.
Early history The Aṣṭādhyāyī of Pāṇini, from c. 4th century BC in Ancient India, is often cited as an example of a premodern work that approaches the sophistication of a modern syntactic theory since works on grammar had been written long before modern syntax came about. In the West, the school of thought that came to be known as "traditional grammar" began with the work of Dionysius Thrax. For centuries, a framework known as grammaire générale, first expounded in 1660 by Antoine Arnauld and Claude Lancelot in a book of the same title, dominated work in syntax: as its basic premise the assumption that language is a direct reflection of thought processes and so there is a single most natural way to express a thought. However, in the 19th century, with the development of historical-comparative linguistics, linguists began to realize the sheer diversity of human language and to question fundamental assumptions about the relationship between language and logic. It became apparent that there was no such thing as the most natural way to express a thought and so logic could no longer be relied upon as a basis for studying the structure of language. The Port-Royal grammar modeled the study of syntax upon that of logic. (Indeed, large parts of Port-Royal Logic were copied or adapted from the Grammaire générale.) Syntactic categories were identified with logical ones, and all sentences were analyzed in terms of "subject – copula – predicate". Initially, that view was adopted even by the early comparative linguists such as Franz Bopp. The central role of syntax within theoretical linguistics became clear only in the 20th century, which could reasonably be called the "century of syntactic theory" as far as linguistics is concerned. (For a detailed and critical survey of the history of syntax in the last two centuries, see the monumental work by Giorgio Graffi (2001).)
Theoretical syntactic models
Dependency grammar
Dependency grammar is an approach to sentence structure in which syntactic units are arranged according to the dependency relation, as opposed to the constituency relation of phrase structure grammars. Dependencies are directed links between words. The (finite) verb is seen as the root of all clause structure and all the other words in the clause are either directly or indirectly dependent on this root (i.e. the verb). Some prominent dependency-based theories of syntax are the following:
Recursive categorical syntax, or algebraic syntax Functional generative description Meaning–text theory Operator grammar Word grammar Lucien Tesnière (1893–1954) is widely seen as the father of modern dependency-based theories of syntax and grammar. He argued strongly against the binary division of the clause into subject and predicate that is associated with the grammars of his day (S → NP VP) and remains at the core of most phrase structure grammars. In place of that division, he positioned the verb as the root of all clause structure.
Categorial grammar
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