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