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in the PONS Dictionary

I. sumar [suˈmar] VB trans

1. sumar MATH:

sumar
sumar

2. sumar:

sumar (una obra)
sumar (hechos)

3. sumar (phrase):

II. sumar [suˈmar] VB refl

OpenDict entry

sumar VB

sumar
presente
yosumo
túsumas
él/ella/ustedsuma
nosotros/nosotrassumamos
vosotros/vosotrassumáis
ellos/ellas/ustedessuman
imperfecto
yosumaba
túsumabas
él/ella/ustedsumaba
nosotros/nosotrassumábamos
vosotros/vosotrassumabais
ellos/ellas/ustedessumaban
indefinido
yosumé
túsumaste
él/ella/ustedsumó
nosotros/nosotrassumamos
vosotros/vosotrassumasteis
ellos/ellas/ustedessumaron
futuro
yosumaré
túsumarás
él/ella/ustedsumará
nosotros/nosotrassumaremos
vosotros/vosotrassumaréis
ellos/ellas/ustedessumarán