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