I may haven you may haven she may haven we may haven you may haven they may haven
V-ing form
I may be havening you may be havening she may be havening we may be havening you may be havening they may be havening
Perfect
I may have havened you may have havened she may have havened we may have havened you may have havened they may have havened
V-ing perfect
I may have been havening you may have been havening she may have been havening we may have been havening you may have been havening they may have been havening
Negation
Simple form
I mayn't haven you mayn't haven she mayn't haven we mayn't haven you mayn't haven they mayn't haven
V-ing form
I mayn't be havening you mayn't be havening she mayn't be havening we mayn't be havening you mayn't be havening they mayn't be havening
Perfect
I mayn't have havened you mayn't have havened she mayn't have havened we mayn't have havened you mayn't have havened they mayn't have havened
V-ing perfect
I mayn't have been havening you mayn't have been havening she mayn't have been havening we mayn't have been havening you mayn't have been havening they mayn't have been havening
Interrogative form
Simple form
may I haven? may you haven? may she haven? may we haven? may you haven? may they haven?
V-ing form
may I be havening? may you be havening? may she be havening? may we be havening? may you be havening? may they be havening?
Perfect
may I have havened? may you have havened? may she have havened? may we have havened? may you have havened? may they have havened?
V-ing perfect
may I have been havening? may you have been havening? may she have been havening? may we have been havening? may you have been havening? may they have been havening?
Interro-negative form
Simple form
mayn't I haven? mayn't you haven? mayn't she haven? mayn't we haven? mayn't you haven? mayn't they haven?
V-ing form
mayn't I be havening? mayn't you be havening? mayn't she be havening? mayn't we be havening? mayn't you be havening? mayn't they be havening?
Perfect
mayn't I have havened? mayn't you have havened? mayn't she have havened? mayn't we have havened? mayn't you have havened? mayn't they have havened?
V-ing perfect
mayn't I have been havening? mayn't you have been havening? mayn't she have been havening? mayn't we have been havening? mayn't you have been havening? mayn't they have been havening?