Abstract

The article examines the theoretical and empirical foundations between determiner phrase (DP) theory in comparison to the traditional noun phrase (NP) framework, emphasizing the pivotal role of determiners in structuring English nominal expressions. Traditionally, noun phrases were seen as central to nominal constructions, with the noun as the head. However, DP theory redefines this view, suggesting that determiners like "the", "a", "this", and "each" serve as the true heads of these structures. The article highlights how determiners shape both syntax and meaning with specific examples and theoretical framework. Additionally, DP theory's ability to explain definiteness, specificity, and possessiveness in English further supports its relevance. By integrating syntactic theory with empirical evidence, this article contributes to a deeper understanding of the role of determiners in shaping nominal syntax and the broader implications for linguistic theory.

Keywords: Noun phrase, determiner phrase, nominal structures, syntax.