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in the PONS Dictionary

corroborer [kɔʀɔbɔʀe] VB trans

corroborer
erhärten
corroborer
untermauern
Présent
jecorrobore
tucorrobores
il/elle/oncorrobore
nouscorroborons
vouscorroborez
ils/ellescorroborent
Imparfait
jecorroborais
tucorroborais
il/elle/oncorroborait
nouscorroborions
vouscorroboriez
ils/ellescorroboraient
Passé simple
jecorroborai
tucorroboras
il/elle/oncorrobora
nouscorroborâmes
vouscorroborâtes
ils/ellescorroborèrent
Futur simple
jecorroborerai
tucorroboreras
il/elle/oncorroborera
nouscorroborerons
vouscorroborerez
ils/ellescorroboreront
See further verb tables