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