What does the interrogative mood express?

The interrogative mood is used to express a question. In English, this mood is characterized by sentence structures that seek information, typically beginning with question words like "who," "what," "where," "when," "why," or "how." Additionally, yes/no questions often begin with auxiliary verbs such as "is," "are," "do," or "can." The primary purpose of the interrogative mood is to elicit a response or information from the listener.

This understanding reinforces the use of the interrogative mood as essential for communication where inquiry is needed, differentiating it from other moods like the indicative mood that states facts or the imperative mood that issues commands or requests.