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