"I am fine." is a phrase which is often translated as "Estoy bien.", and "well" is an adjective which is often translated as "bien". Learn more about the difference between "I am fine." and "well" below.
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An adjective is a word that describes a noun (e.g. the big dog).
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g. Wow!).