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