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"Estoy" is a form of "estoy", a phrase which is often translated as "I'm". "Hoy" is an adverb which is often translated as "today". Learn more about the difference between "estoy" and "hoy" below.
estoy
A phrase is a group of words commonly used together (e.g., once upon a time).
hoy(
oy
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
2. (nowadays)