Is an adjective adverb or verb?

"An" is neither an adjective, adverb, nor verb. It's a definite article, a word used to specify a particular noun.

Let's break down the parts of your question:

* Adjective: Describes a noun (e.g., "big," "red," "happy")

* Adverb: Modifies a verb, adjective, or another adverb (e.g., "quickly," "very," "extremely")

* Verb: Shows action or state of being (e.g., "run," "jump," "is," "seems")

"An" is used before nouns that start with a vowel sound (e.g., "an apple," "an umbrella").

Let me know if you have more questions about parts of speech!