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, "deliberately" would answer questions like:
* How did they do it? (They did it deliberately.)
* To what extent were they involved? (They were deliberately involved.)
Example:
* "He deliberately ignored her question." (Modifies the verb "ignored")