Present participle; Past participle - corroborating - corroborated Present - corroborate - corroborate - corroborates - corroborate - corroborate - corroborate Past - corroborated - corroborated - corroborated - corroborated - corroborated - corroborated Future - will corroborate - will corroborate - will corroborate - will corroborate - will corroborate - will corroborate Present conditional - would corroborate - would corroborate - would corroborate - would corroborate - would corroborate - would corroborate Present Perfect - have corroborated - have corroborated - has corroborated - have corroborated - have corroborated - have corroborated Past Perfect - had corroborated - had corroborated - had corroborated - had corroborated - had corroborated - had corroborated Future Perfect - will have corroborated - will have corroborated - will have corroborated - will have corroborated - will have corroborated - will have corroborated Past conditional - would have corroborated - would have corroborated - would have corroborated - would have corroborated - would have corroborated - would have corroborated Imperative - - - corroborate - - - - - - - -