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