The keyword phrase functions grammatically as a nominal clause, also known as a noun clause. Specifically, it is an interrogative content clause introduced by the wh-word "what." Despite its appearance as a question, its role within a larger (often implied) sentence structure is that of a single noun, representing the object of an inquiry. For instance, in the implied statement, "[This article explains] what to watch patriots day on," the entire phrase serves as the direct object of the verb "explains."
This classification is derived from the phrase's internal structure. It is a non-finite clause, meaning it lacks a tensed verb. The core components are the interrogative pronoun "what," the infinitive verb phrase "to watch," the proper noun "Patriots Day" (acting as the object of the infinitive), and the terminal preposition "on." This structure, a "wh-infinitive clause," cannot stand alone as a complete sentence but operates cohesively to name the concept or piece of information being soughtin this case, the location or platform for viewing.
Recognizing the keyword's function as a nominal clause is crucial because it defines the user's intent and the required structure of the answer. The phrase is grammatically seeking a noun or a set of nouns as its resolution. Therefore, the main point of any content developed from this keyword must be to provide specific proper nouns that identify the streaming services, platforms, or channels where the film is available. The grammatical analysis dictates that the article's purpose is not to discuss the act of watching, but to supply the nominal information requested by the clause.
