may master
Regular verb: master - mastered- mastered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may master
you may master
he may master
we may master
you may master
they may master 	I may be mastering
you may be mastering
he may be mastering
we may be mastering
you may be mastering
they may be mastering	I may have mastered
you may have mastered
he may have mastered
we may have mastered
you may have mastered
they may have mastered	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 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't master
you mayn't master
he mayn't master
we mayn't master
you mayn't master
they mayn't master 	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	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	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 	V-ing form 	Perfect 	V-ing perfect 	
may I master?
may you master?
may he master?
may we master?
may you master?
may they master? 	may I be mastering?
may you be mastering?
may he be mastering?
may we be mastering?
may you be mastering?
may they be mastering? 	may I have mastered?
may you have mastered?
may he have mastered?
may we have mastered?
may you have mastered?
may they have mastered? 	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 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I master?
mayn't you master?
mayn't he master?
mayn't we master?
mayn't you master?
mayn't they master? 	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? 	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? 	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?