Adverbs are words that typically modify a verb, an adjective, another adverb or an entire sentence:
- ‘I keep hoping they'll come back,’ Tanya said despairingly. [W2F-006 #244]
In this case the adverb modifies the verb said.
- It’s a very fast road all the way. [S1A-021 #195]
In this case the adverb modifies the adjective fast.