Examples

In this (extremely unlikely, we hope) sentence, whose is an interrogative adjective that modifies the noun locker.

If they're seeking enlightenment, they should read The Berenstain Bears and the Messy Room. Papa Bear's organizational skills are so good he deserves his own show on HGTV. And our grammar skills are so good that we can tell you with complete confidence that, in this example, the interrogative adjective which modifies the noun book.

In this groovy sentence, what is an interrogative adjective that modifies the noun poster. Black and light are both descriptive adjectives that further describe the type of poster being sought.