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