What is one way that the following sentence can be improved with the addition of an adverb?: The mayor pledged to spend more money on the city's roads after many residents complained about the numerous potholes.
The mayor earnestly pledged to spend more money on the city's roads after many residents relentlessly complained about the numerous potholes.
Addition of an adverb adds clarity and descriptiveness to the sentence, as it further describes the verb...
Answers questions like in this particular case:
How did the mayor pledge?
In what manner did the residents complain?