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"Interesantes" is a form of "interesante", an adjective which is often translated as "interesting". "Muy" is an adverb which is often translated as "very". Learn more about the difference between "interesantes" and "muy" below.
interesante(
een
-
teh
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reh
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sahn
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teh
)An adjective is a word that describes a noun (e.g., the big dog).
1. (intriguing)
a. interesting
Andrés está leyendo un libro muy interesante sobre la lexicografía.Andrew is reading a very interesting book about lexicography.
muy(
mwee
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).