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