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In linguistics, surface structure refers to the formal representation of a sentence's phonetic form. This concept is part of Noam Chomsky's theories of generative grammar, which aim to explain how humans can produce an infinite number of grammatical sentences using finite means.12

In earlier versions of Chomsky's transformational grammar, sentences were understood to have two levels of structure: a "deep structure" where meaning is interpreted, and a "surface structure" where phonetic interpretation occurs. The surface structure is the final derived phrase marker of a sentence, generated through transformational rules applied to the underlying phrase structure. While Chomsky's later theories have evolved, the distinction between underlying and final forms of sentences remains a key area of study in understanding language.23

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