An interrogative gesture or tone of voice shows that you want to know the answer to a question.

In grammar, a clause that is in the interrogative, or in the interrogative mood, has its subject following 'do', 'be', 'have', or a modal verb. Examples are 'When did he get back?' and 'Are you all right?'. Clauses of this kind are typically used to ask questions.

In grammar, an interrogative is a word such as 'who', 'how', or 'why', which can be used to ask a question.