Here's why:
* Adverbs modify verbs, adjectives, or other adverbs. They tell us *how*, *when*, *where*, or *to what extent* something happens.
* In a sentence, "sharply" would describe how something is done. For example:
* "The knife cut sharply through the bread." (modifies the verb "cut")
* "The temperature dropped sharply." (modifies the verb "dropped")
Let me know if you'd like more examples!