The main point of the keyword phrase "what day of the week is sept 11" is the concept of the "day of the week." Grammatically, this component is a noun. The query seeks a specific answer, such as "Tuesday," which is a proper noun, a specific name for one of the seven days. Therefore, the core of the keyword targets a noun as its resolution.
A grammatical analysis of the interrogative sentence "What day of the week is Sept 11?" reveals its structure. "Sept 11" functions as a proper noun phrase and is the subject of the sentence. "Is" is a linking verb. The phrase "what day of the week" acts as the predicate nominative (or subject complement), with "what" serving as an interrogative determiner modifying the head noun, "day." The user's search intent is to identify the specific proper noun (e.g., Sunday, Monday, Tuesday) that corresponds to the subject, "Sept 11," for a given year.
Understanding that the primary part of speech is a noun is crucial because it dictates the nature of the article's content. The article's purpose is not to describe an action (verb) or modify a concept (adjective) but to provide a specific, factual piece of informationa named entity. Consequently, the content should be structured to deliver this nominal data clearly, for instance, by using tables listing the day of the week for September 11th across various years, or by explaining the calendrical algorithm used to determine the specific day (a proper noun).
