In addition to interrogative adjectives, interrogative pronouns, and interrogative prepositions, one other group of words is also used in the formation of questions—the interrogative adverbs come? (how), dove? (where), perché? (why), and quando? (when).

ITALIAN INTERROGATIVE ADVERBS
 
Come (KOH-meh)?
 (How?)
 Come sta Giancarlo?
 
Dove (DOH-vay)?
 (Where?)
 Dov’è la biblioteca?
 
Perché (pair-KEH)?
 (Why?)
 Perché non dormono?
 
Quando (KWAN-doh)?
 (When?)
 Quando parte Pietro?