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