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 may not master you may not master he may not master we may not master you may not master they may not master
V-ing form
I may not be mastering you may not be mastering he may not be mastering we may not be mastering you may not be mastering they may not be mastering
Perfect
I may not have mastered you may not have mastered he may not have mastered we may not have mastered you may not have mastered they may not have mastered
V-ing perfect
I may not have been mastering you may not have been mastering he may not have been mastering we may not have been mastering you may not have been mastering they may not 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
may I not master? may you not master? may he not master? may we not master? may you not master? may they not master?
V-ing form
may I not be mastering? may you not be mastering? may he not be mastering? may we not be mastering? may you not be mastering? may they not be mastering?
Perfect
may I not have mastered? may you not have mastered? may he not have mastered? may we not have mastered? may you not have mastered? may they not have mastered?
V-ing perfect
may I not have been mastering? may you not have been mastering? may he not have been mastering? may we not have been mastering? may you not have been mastering? may they not have been mastering?