Here are some key characteristics of interrogative sentences:
* They use question words: These include words like "who," "what," "where," "when," "why," and "how."
* They often use the word order "auxiliary verb + subject + main verb": For example, "Are you going to the store?" or "Did you finish your homework?"
* They may use a rising intonation at the end. This is a slight upward inflection of the voice that signals a question.
Here are some examples of interrogative sentences:
* What is your name?
* Where are you going?
* Why are you sad?
* Do you like pizza?
* Can you help me with this?
Note: Not all sentences ending with a question mark are interrogative. For example, a statement with a rhetorical question might end with a question mark but doesn't actually ask for information.