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