Here's why:
* Verbs express actions or states of being. Examples: run, jump, sleep, exist.
* Adverbs modify verbs, adjectives, or other adverbs. They tell us how, when, where, or to what extent something happens.
Examples:
* There is a cat in the garden. ("There" indicates location.)
* I put the book there. ("There" indicates location.)
Let me know if you have any other questions!