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Abstract
This article explores the theory of parts of the sentence, focusing on its
three main components: principal, secondary, and tertiary parts. The principal parts subject
and predicate—form the structural foundation of sentences, while secondary parts such as
objects, complements, and adverbial modifiers add depth and detail. The article highlights
the challenges posed by tertiary elements like appositions, interjections, and parenthetical
expressions, which often defy strict categorization due to their fluidity and contextual
significance. Beyond grammatical analysis, the article examines the broader implications
of this theory for syntax, semantics, pedagogy, and computational linguistics.
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