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