Transformational grammar

In linguistics, a transformational grammar or transformational-generative grammar (TG, TGG) is a generative grammar, especially of a natural language, that involves the use of defined operations called transformations to produce new sentences from existing ones. The concept was originated by Noam Chomsky, and much current research in transformational grammar is inspired by Chomsky's Minimalist Program.

Deep structure and surface structure

In 1957, Noam Chomsky published Syntactic Structures, in which he developed the idea that each sentence in a language has two levels of representation — a deep structure and a surface structure. The deep structure represented the core semantic relations of a sentence, and was mapped on to the surface structure (which followed the phonological form of the sentence very closely) via transformations. Chomsky believed there are considerable similarities between languages' deep structures, and that these structures reveal properties, common to all languages that surface structures conceal. However, this may not have been the central motivation for introducing deep structure. Transformations had been proposed prior to the development of deep structure as a means of increasing the mathematical and descriptive power of context-free grammars. Similarly, deep structure was devised largely for technical reasons relating to early semantic theory. Chomsky emphasizes the importance of modern formal mathematical devices in the development of grammatical theory:

Generative grammar

Generative grammar is a linguistic theory that considers grammar to be a system of rules that is intended to generate exactly those combinations of words which form grammatical sentences in a given language. The term was originally used in relation to the theories of grammar developed by Noam Chomsky, beginning in the late 1950s. Linguists who follow the generative approach originated by Chomsky have been called generativists. The generative school has focused on the study of syntax, but has also addressed other aspects of a language's structure, including morphology and phonology.

Early versions of Chomsky's theory were called transformational grammar, and this is still used as a general term that includes his subsequent theories, the most recent being the Minimalist Program. Chomsky and other generativists have argued that many of the properties of a generative grammar arise from a universal grammar which is innate to the human brain, rather than being learned from the environment (see the poverty of the stimulus argument).

Noam Chomsky

Avram Noam Chomsky (/ˈnoʊm ˈtʃɒmski/; born December 7, 1928) is an American linguist, philosopher, cognitive scientist, historian, logician, social critic, and political activist. Sometimes described as "the father of modern linguistics," Chomsky is also a major figure in analytic philosophy, and one of the founders of the field of cognitive science. He has spent most of his career at the Massachusetts Institute of Technology (MIT), where he is Institute Professor Emeritus, and is the author of over 100 books, primarily on politics and linguistics. Ideologically, he aligns with anarcho-syndicalism and libertarian socialism.

Born to a middle-class Ashkenazi Jewish family in Philadelphia, Chomsky developed an early interest in anarchism from alternative bookstores in New York City. At the age of sixteen he began studies at the University of Pennsylvania, taking courses in linguistics, mathematics, and philosophy. He married fellow linguist Carol Schatz in 1949. From 1951 to 1955 he was appointed to Harvard University's Society of Fellows, where he developed the theory of transformational grammar for which he was awarded his doctorate in 1955. That year he began teaching at MIT, in 1957 emerging as a significant figure in the field of linguistics for his landmark work Syntactic Structures, which laid the basis for the scientific study of language, while from 1958 to 1959 he was a National Science Foundation fellow at the Institute for Advanced Study. He is credited as the creator or co-creator of the universal grammar theory, the generative grammar theory, the Chomsky hierarchy, and the minimalist program. Chomsky also played a pivotal role in the decline of behaviorism, being particularly critical of the work of B. F. Skinner.