Here's a breakdown of how it's used:
* As an adjective: Describes something that is in the form of a question.
* "The interrogative sentence, 'Where did you go?'"
* "The interrogative tone of her voice made me nervous."
* As a noun: Refers to a word or phrase used to ask a question.
* "The interrogatives 'who,' 'what,' and 'where' are essential for asking questions."
* "We learned about different types of interrogatives in grammar class."
Essentially, anything that is "interrogative" is related to questioning or inquiry.