I could corroborate you could corroborate she could corroborate we could corroborate you could corroborate they could corroborate
Forme en V-ing
I could be corroborating you could be corroborating she could be corroborating we could be corroborating you could be corroborating they could be corroborating
Perfect
I could have corroborated you could have corroborated she could have corroborated we could have corroborated you could have corroborated they could have corroborated
Perfect en V-ing
I could have been corroborating you could have been corroborating she could have been corroborating we could have been corroborating you could have been corroborating they could have been corroborating
Négation
Forme simple
I couldn't corroborate you couldn't corroborate she couldn't corroborate we couldn't corroborate you couldn't corroborate they couldn't corroborate
Forme en V-ing
I couldn't be corroborating you couldn't be corroborating she couldn't be corroborating we couldn't be corroborating you couldn't be corroborating they couldn't be corroborating
Perfect
I couldn't have corroborated you couldn't have corroborated she couldn't have corroborated we couldn't have corroborated you couldn't have corroborated they couldn't have corroborated
Perfect en V-ing
I couldn't have been corroborating you couldn't have been corroborating she couldn't have been corroborating we couldn't have been corroborating you couldn't have been corroborating they couldn't have been corroborating
Forme interrogative
Forme simple
could I corroborate? could you corroborate? could she corroborate? could we corroborate? could you corroborate? could they corroborate?
Forme en V-ing
could I be corroborating? could you be corroborating? could she be corroborating? could we be corroborating? could you be corroborating? could they be corroborating?
Perfect
could I have corroborated? could you have corroborated? could she have corroborated? could we have corroborated? could you have corroborated? could they have corroborated?
Perfect en V-ing
could I have been corroborating? could you have been corroborating? could she have been corroborating? could we have been corroborating? could you have been corroborating? could they have been corroborating?
Forme interro-négative
Forme simple
couldn't I corroborate? couldn't you corroborate? couldn't she corroborate? couldn't we corroborate? couldn't you corroborate? couldn't they corroborate?
Forme en V-ing
couldn't I be corroborating? couldn't you be corroborating? couldn't she be corroborating? couldn't we be corroborating? couldn't you be corroborating? couldn't they be corroborating?
Perfect
couldn't I have corroborated? couldn't you have corroborated? couldn't she have corroborated? couldn't we have corroborated? couldn't you have corroborated? couldn't they have corroborated?
Perfect en V-ing
couldn't I have been corroborating? couldn't you have been corroborating? couldn't she have been corroborating? couldn't we have been corroborating? couldn't you have been corroborating? couldn't they have been corroborating?