What is the structure of interrogative sentence?

An interrogative sentence typically begins with an auxiliary verb (like "is," "are," "do," or "can") or a question Word (such as "who," "what," "where," "when," or "why"). This is followed by the subject and the main verb. For example, in the question "Are you coming to the party?" the structure is auxiliary verb ("Are"), subject ("you"), and main verb ("coming"). The sentence often ends with a question mark.