Interrogative adverbs (avverbi interrogative) are adverbs which introduce a question. These adverbs are the same as the avverbi esclamativi, but they are used in questions rather than statements.
When questions are introduced with an interrogative adverb, the subject must follow the verb, with the exception of perché and come mai, where it can either follow or precede the verb.
When questions are introduced with an interrogative adverb, the subject must follow the verb, with the exception of perché and come mai, where it can either follow or precede the verb.