The provided key term is not a single part of speech; it is a complete declarative clause. Its grammatical function is to make a factual assertion. The core of this clause is a subject-verb-predicate structure, where a subject is described or classified by the rest of the sentence. The main point, from a grammatical perspective, is this predicative function.
A detailed syntactic analysis breaks the clause into its constituent parts. "Patriots Day" functions as a proper noun, serving as the subject of the sentence. The word "es" is the third-person singular present indicative form of the verb "ser" (to be), acting as a copular or linking verb. The phrase "basada en hechos reales" serves as the predicate. Within this predicate, "basada" is a past participle used as a predicate adjective, describing the subject. The feminine singular ending "-a" implies it modifies an understood feminine noun, such as "la pelcula" (the movie). This adjective is followed by the prepositional phrase "en hechos reales," which modifies "basada" and clarifies the basis of its assertion.
The crucial takeaway for an article using this key term is the relationship of predication. The clause establishes a direct link between the subject (the film) and a specific attribute (being based on real events). Therefore, the main point is the adjectival and descriptive nature of the predicate, which defines the subject's connection to reality. The entire clause functions to classify the work as a docudrama or historical narrative, making this classification its most important semantic feature.
