This is a regular verb. It follows the conjugation pattern of the verb comer.
PresentPresente
Este restaurante siempre sorprende a sus clientes.
This restaurant always surprises its customers.
PreteritePretérito indefinido
La noticia sorprendió a toda la familia.
The news surprised the whole family.
FutureFuturo
El regalo sorprenderá a mamá el domingo.
The gift will surprise Mom on Sunday.
Imperfect SubjunctiveImperfecto de subjuntivo
No pensé que la noticia nos sorprendiese tanto.
I didn't think the news would surprise us so much.