The keyword term functions as an interrogative clause, which is a type of sentence that asks a direct question. The main point or grammatical subject of this clause is the compound proper noun "Veterans Day." This noun identifies the specific entity about which information is being sought.
A detailed grammatical analysis breaks the clause into its constituent parts of speech. "When" is an interrogative adverb that modifies the verb and specifies that the requested information relates to time. "Is" is a linking verb (a form of "to be"). "Happy" is an adjective, which in this context colloquially modifies the main subject. The core of the phrase is "Veterans Day," a compound proper noun that names the specific holiday. In the syntax of a question, the subject ("Veterans Day") follows the verb ("is"), but it remains the central topic of the inquiry.
For the purpose of an article, identifying the main point as the proper noun "Veterans Day" is critical. It establishes the article's primary subject matter. The interrogative adverb "when" dictates the central question the article must answerproviding the date, November 11th. The adjective "happy" suggests the article should also address the tone of the holiday and common greetings associated with its observance. This grammatical determination allows the query to be deconstructed into a clear content structure focused on a specific entity (noun), a primary piece of information (adverb), and user sentiment (adjective).
