Here are the key characteristics of interrogative sentences:
* They always end with a question mark (?).
* They typically use a question word (who, what, when, where, why, how, which) or an auxiliary verb (do, does, did, have, has, had, will, would, can, could, may, might, should, must).
* The word order is usually inverted, meaning the subject comes after the verb.
Here are some examples:
* What is your name? (uses a question word)
* Do you like pizza? (uses an auxiliary verb)
* Are you coming to the party? (uses an auxiliary verb and inverted word order)
Interrogative sentences are essential for communication as they allow us to seek information and understanding.