ought to master
Regular verb: master - mastered- mastered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to master
you ought to master
he ought to master
we ought to master
you ought to master
they ought to master 	I ought to be mastering
you ought to be mastering
he ought to be mastering
we ought to be mastering
you ought to be mastering
they ought to be mastering	I ought to have mastered
you ought to have mastered
he ought to have mastered
we ought to have mastered
you ought to have mastered
they ought to have mastered	I ought to have been mastering
you ought to have been mastering
he ought to have been mastering
we ought to have been mastering
you ought to have been mastering
they ought to have been mastering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to master
you oughtn't to master
he oughtn't to master
we oughtn't to master
you oughtn't to master
they oughtn't to master 	I oughtn't to be mastering
you oughtn't to be mastering
he oughtn't to be mastering
we oughtn't to be mastering
you oughtn't to be mastering
they oughtn't to be mastering	I oughtn't to have mastered
you oughtn't to have mastered
he oughtn't to have mastered
we oughtn't to have mastered
you oughtn't to have mastered
they oughtn't to have mastered	I oughtn't to have been mastering
you oughtn't to have been mastering
he oughtn't to have been mastering
we oughtn't to have been mastering
you oughtn't to have been mastering
they oughtn't to have been mastering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I master?
ought to you master?
ought to he master?
ought to we master?
ought to you master?
ought to they master? 	ought to I be mastering?
ought to you be mastering?
ought to he be mastering?
ought to we be mastering?
ought to you be mastering?
ought to they be mastering? 	ought to I have mastered?
ought to you have mastered?
ought to he have mastered?
ought to we have mastered?
ought to you have mastered?
ought to they have mastered? 	ought to I have been mastering?
ought to you have been mastering?
ought to he have been mastering?
ought to we have been mastering?
ought to you have been mastering?
ought to they have been mastering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to master?
oughtn't you to master?
oughtn't he to master?
oughtn't we to master?
oughtn't you to master?
oughtn't they to master? 	oughtn't I to be mastering?
oughtn't you to be mastering?
oughtn't he to be mastering?
oughtn't we to be mastering?
oughtn't you to be mastering?
oughtn't they to be mastering? 	oughtn't I to have mastered?
oughtn't you to have mastered?
oughtn't he to have mastered?
oughtn't we to have mastered?
oughtn't you to have mastered?
oughtn't they to have mastered? 	oughtn't I to have been mastering?
oughtn't you to have been mastering?
oughtn't he to have been mastering?
oughtn't we to have been mastering?
oughtn't you to have been mastering?
oughtn't they to have been mastering?