The main point of the keyword term is the proper noun "Patriots Day." As a proper noun, it functions as the central subject, naming a specific entityin this case, the 2016 film. The rest of the phrase serves to describe or qualify this noun, establishing it as the article's core topic.
Grammatically, "Patriots Day" is the head of the noun phrase. The subsequent words, "based on a true story," form a participial phrase. This phrase functions adjectivally, modifying the proper noun by providing essential information about its genre and source material. The word "based" is a past participle that introduces this descriptive clause, clarifying the film's relationship to factual events.
This grammatical determination is crucial because it dictates that the article's primary focus is on the specific entity named "Patriots Day." The adjectival phrase then establishes the central analytical lens for the article: an examination of the film's connection to and depiction of historical reality. Therefore, the keyword signals that the subject is the film itself, analyzed through the context of its factual accuracy.
