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Both "sorprendió" and "sorprendí" are forms of "sorprender", which is often translated as "to surprise". Learn more about "sorprender" below.
sorprender(
sohr
-
prehn
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dehr
)A transitive verb is a verb that requires a direct object (e.g., I bought a book.).
a. to surprise
Sus amigos la sorprendieron con una fiesta de cumpleaños.Her friends surprised her with a birthday party.
a. to catch
Sorprendí a mi hijo intentando sacar una galleta del tarro de galletas.I caught my son trying to take a cookie out of the cookie jar.
sorprenderse
A pronominal verb always uses a reflexive pronoun. (e.g., Te ves cansado.).
