Editing Transformational grammar (section)

===Deep structure and surface structure===
{{linguistics}}
{{main article|Deep structure and surface structure}}
In transformational grammar, each sentence in a language has two levels of representation: a deep structure and a surface structure.<ref name="aspects">{{cite book|title=Aspects of the Theory of Syntax|publisher=MIT Press|author=Chomsky, Noam|year=1965|isbn=0-262-53007-4|url=https://archive.org/details/aspectsoftheoryo00chom}}</ref> The deep structure represents a sentence's core [[semantics|semantic relations]] and is mapped onto the surface structure, which follows the sentence's [[phonology|phonological system]] very closely, via ''transformations''.

Deep structures are generated by [[phrase structure grammar]]s using [[rewriting|rewrite rules]].