Interrogative means asking a question or having the form of a question. In grammar, an interrogative sentence is one that asks something and ends with a question mark. “What time is lunch?” and “Did you finish your homework?” are both interrogative sentences.

When detectives conduct an interrogation, they're asking someone many questions to find out what happened. An interrogative tone is the way your voice rises at the end when you're asking something, even if you're not using question words.

In English, we have special interrogative words that help us ask questions: who, what, when, where, why, and how. These are sometimes called question words or interrogatives for short. Each one asks for a different type of information. Who asks about people, when asks about time, where asks about place, and so on.

You can also use interrogative as a noun. If your teacher says “Turn that sentence into an interrogative,” she means change it from a statement into a question. “You went to the store” becomes the interrogative “Did you go to the store?”

The opposite of interrogative is declarative, which means making a statement rather than asking a question.