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An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
a. de improviso
The Secretary of State arrived unexpectedly at the war zone.El Secretario de Estado llegó de improviso a la zona en guerra.
The fire alarm went off unexpectedly just as I was starting a test at school.La alarma de incendios sonó inesperadamente justo cuando empezaba un examen en la escuela.
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