Define the Deep Structure and Surface Structure of Transformational Grammar?
According to Chomskyan theory, transformational grammar involves two levels to represent the structure of sentences known as the “deep structure” and the “surface structure”. The “deep structure” implies a more abstract form underlying the structure of a sentence. It is represented by a “phrase structure tree” in which the abstract relations between words and phrases of a sentence are depicted in a “hierarchical tree diagram”. The “surface structure” refers to the actual form of the structure of a sentence used. Besides the two levels of sentence structure, transformational grammar consists of a body of formal rules to enable transforming deep structures to surface structures.