Verb mood refers to the form a verb takes to express the speaker's attitude toward the action or state described. The three primary moods in English are indicative, imperative, and subjunctive. The indicative mood states facts or asks questions, the imperative mood gives commands or requests, and the subjunctive mood expresses wishes, hypotheticals, or conditions contrary to fact. Each mood serves a different purpose in communication. For example, in the indicative mood, one might say, "She runs every day." In the imperative mood, a command would be, "Run faster!" Meanwhile, the subjunctive mood could be illustrated with, "If she were to run, she would win." Understanding these moods helps convey meaning more effectively.