We use Adverbs to say something about Verbs, Adjectives and sometimes other Adverbs or even a whole sentence.
- We calmly waited for 10 minutes, but still they didn't help us.
- He was terribly disappointed.
- The car doesn't drive very quickly.
- Surely, that was a mistake!
Is you can answer the question: How does it ...? You are dealing with an Adverb.