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