The interrogative form is a grammatical structure used to ask questions. It typically involves rearranging the subject and auxiliary verb or using question words like who, what, where, when, why, and how. For example, the statement "You are coming" becomes "Are you coming?" in interrogative form. In English, the interrogative form can be simple or complex. Simple questions often start with an auxiliary verb, while complex questions may include additional clauses. Understanding this form is essential for effective communication and helps in gathering information or clarifying doubts.