An adverb is a word that extends the meaning and narrows the application of any part of speech except a Nouns or Pronoun.Examples:
1. With verb : I much admire his industry.
2. With adjective : He is deservedly successful.
3. With preposition : The body floated partly above and partly above and partly below
4. With conjunction : He was despired, merely because he was poor.
In the examples:
1) the Verb “admire” is qualified by the Adverb “much”.
2) the adjective “successful” is qualified by the Adverb “desevedly”.
3) the Preposition “above” is qualified by the Adverb “partly” ; and the preposition “below” by the same Adverb.