I can corroborate you can corroborate she can corroborate we can corroborate you can corroborate they can corroborate
V-ing form
I can be corroborating you can be corroborating she can be corroborating we can be corroborating you can be corroborating they can be corroborating
Perfect
I can have corroborated you can have corroborated she can have corroborated we can have corroborated you can have corroborated they can have corroborated
V-ing perfect
I can have been corroborating you can have been corroborating she can have been corroborating we can have been corroborating you can have been corroborating they can have been corroborating
Negation
Simple form
I can't corroborate you can't corroborate she can't corroborate we can't corroborate you can't corroborate they can't corroborate
V-ing form
I can't be corroborating you can't be corroborating she can't be corroborating we can't be corroborating you can't be corroborating they can't be corroborating
Perfect
I can't have corroborated you can't have corroborated she can't have corroborated we can't have corroborated you can't have corroborated they can't have corroborated
V-ing perfect
I can't have been corroborating you can't have been corroborating she can't have been corroborating we can't have been corroborating you can't have been corroborating they can't have been corroborating
Interrogative form
Simple form
can I corroborate? can you corroborate? can she corroborate? can we corroborate? can you corroborate? can they corroborate?
V-ing form
can I be corroborating? can you be corroborating? can she be corroborating? can we be corroborating? can you be corroborating? can they be corroborating?
Perfect
can I have corroborated? can you have corroborated? can she have corroborated? can we have corroborated? can you have corroborated? can they have corroborated?
V-ing perfect
can I have been corroborating? can you have been corroborating? can she have been corroborating? can we have been corroborating? can you have been corroborating? can they have been corroborating?
Interro-negative form
Simple form
can't I corroborate? can't you corroborate? can't she corroborate? can't we corroborate? can't you corroborate? can't they corroborate?
V-ing form
can't I be corroborating? can't you be corroborating? can't she be corroborating? can't we be corroborating? can't you be corroborating? can't they be corroborating?
Perfect
can't I have corroborated? can't you have corroborated? can't she have corroborated? can't we have corroborated? can't you have corroborated? can't they have corroborated?
V-ing perfect
can't I have been corroborating? can't you have been corroborating? can't she have been corroborating? can't we have been corroborating? can't you have been corroborating? can't they have been corroborating?