Interrogative adjectives modify nouns and pronouns in questions.
There are only three of them, so they shouldn't be too hard to remember:
- what
- which
- whose
Remember that "interrogative" has its root in "interrogate," an unpleasant series of questions that may include, but are not limited to "Do you know the Muffin Man?"
![](https://media1.shmoop.com/images/general/graphics/interrogative-adjectives.png)