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in the PONS Dictionary

I. testificar <c → qu> [testifiˈkar] VB trans

1. testificar:

testificar (declarar)
testificar (testigo)

2. testificar:

testificar (afirmar: testigo)
testificar (afirmar: testigo)
testificar (documento)
testificar (documento)

3. testificar (demostrar):

testificar

II. testificar <c → qu> [testifiˈkar] VB intr

testificar
presente
yotestifico
tútestificas
él/ella/ustedtestifica
nosotros/nosotrastestificamos
vosotros/vosotrastestificáis
ellos/ellas/ustedestestifican
imperfecto
yotestificaba
tútestificabas
él/ella/ustedtestificaba
nosotros/nosotrastestificábamos
vosotros/vosotrastestificabais
ellos/ellas/ustedestestificaban
indefinido
yotestifiqué
tútestificaste
él/ella/ustedtestificó
nosotros/nosotrastestificamos
vosotros/vosotrastestificasteis
ellos/ellas/ustedestestificaron
futuro
yotestificaré
tútestificarás
él/ella/ustedtestificará
nosotros/nosotrastestificaremos
vosotros/vosotrastestificaréis
ellos/ellas/ustedestestificarán