Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I may fail fail you may fail fail she may fail fail we may fail fail you may fail fail they may fail fail
V-ing form
I may be fail failing you may be fail failing she may be fail failing we may be fail failing you may be fail failing they may be fail failing
Perfect
I may have fail failed you may have fail failed she may have fail failed we may have fail failed you may have fail failed they may have fail failed
V-ing perfect
I may have been fail failing you may have been fail failing she may have been fail failing we may have been fail failing you may have been fail failing they may have been fail failing
Negation
Simple form
I mayn't fail fail you mayn't fail fail she mayn't fail fail we mayn't fail fail you mayn't fail fail they mayn't fail fail
V-ing form
I mayn't be fail failing you mayn't be fail failing she mayn't be fail failing we mayn't be fail failing you mayn't be fail failing they mayn't be fail failing
Perfect
I mayn't have fail failed you mayn't have fail failed she mayn't have fail failed we mayn't have fail failed you mayn't have fail failed they mayn't have fail failed
V-ing perfect
I mayn't have been fail failing you mayn't have been fail failing she mayn't have been fail failing we mayn't have been fail failing you mayn't have been fail failing they mayn't have been fail failing
Interrogative form
Simple form
may I fail fail? may you fail fail? may she fail fail? may we fail fail? may you fail fail? may they fail fail?
V-ing form
may I be fail failing? may you be fail failing? may she be fail failing? may we be fail failing? may you be fail failing? may they be fail failing?
Perfect
may I have fail failed? may you have fail failed? may she have fail failed? may we have fail failed? may you have fail failed? may they have fail failed?
V-ing perfect
may I have been fail failing? may you have been fail failing? may she have been fail failing? may we have been fail failing? may you have been fail failing? may they have been fail failing?
Interro-negative form
Simple form
mayn't I fail fail? mayn't you fail fail? mayn't she fail fail? mayn't we fail fail? mayn't you fail fail? mayn't they fail fail?
V-ing form
mayn't I be fail failing? mayn't you be fail failing? mayn't she be fail failing? mayn't we be fail failing? mayn't you be fail failing? mayn't they be fail failing?
Perfect
mayn't I have fail failed? mayn't you have fail failed? mayn't she have fail failed? mayn't we have fail failed? mayn't you have fail failed? mayn't they have fail failed?
V-ing perfect
mayn't I have been fail failing? mayn't you have been fail failing? mayn't she have been fail failing? mayn't we have been fail failing? mayn't you have been fail failing? mayn't they have been fail failing?