Final answer:
Noam Chomsky formulated a grammatical system called transformational grammar, also known as Chomskyan grammar or Generative Grammar.
Step-by-step explanation:
Noam Chomsky formulated a grammatical system called transformational grammar in which sentence structures are derived by transforming basic kernel sentences. This system is also known as Chomskyan grammar or Generative Grammar. In transformational grammar, the process of transforming kernel sentences allows for the generation of a wide range of complex and grammatically correct sentences.