 Since every normal human child is capable of acquiring any language, this endowment is also called by the name of "universal grammar".With his book "Syntactic Structures" (1957), Chomsky established the concept of transformational generative grammar (TGG), a formal approach to linguistic theorizing, and revolutionized the discipline of linguistics.In "Aspects of the Theory of Syntax" (1965), the TGG model went through a revision, which included the inclusion of a lexical component, the separation of deep from surface structures, and the introduction of some technical innovations such as syntactic features and recursive phrase structure rules.