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