An adverb is a word or an expression that modifies a verb, adjective, another adverb, determiner, clause, preposition, or sentence. Adverbs typically express manner, place, time, frequency, degree, level of certainty, etc., answering questions such as how?, in what way?, when?, where?, and to what extent?.
A great way to pick out an adverb from a sentence is to look for the word ending in -ly. Although that's not universally true, it's a good place to start. Also, given their function, these fundamental elements of the English language are usually placed right before or after the verb in the sentence.
Adverbs are intensifiers and they can even come in the form of an adverb phrases. That just means you're looking at two or more words that act as an adverb. Let's take some time to dive (v.) deeply (adv.) into these popular modifiers.
Here are some examples of adverbs modifying verbs:
He runs quickly. She walks slowly. He's happily chattering over there in the corner.
Adverbs can also modify adjectives or other adverbs. They provide more information about that other descriptive word. For example:
He runs very quickly.
In this sentence, the adverb "very" is describing the adverb "quickly" ("very quickly" can be used as an adverb phrase).
An incredibly pretty girl sat down next to me.
In this sentence, the adverb "incredibly" is describing the adjective "pretty."
I hope this answer helps!😊