should master
Verbo regular: master - mastered- mastered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I should master
you should master
she should master
we should master
you should master
they should master 	I should be mastering
you should be mastering
she should be mastering
we should be mastering
you should be mastering
they should be mastering	I should have mastered
you should have mastered
she should have mastered
we should have mastered
you should have mastered
they should have mastered	I should have been mastering
you should have been mastering
she should have been mastering
we should have been mastering
you should have been mastering
they should have been mastering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I should not master
you should not master
she should not master
we should not master
you should not master
they should not master 	I should not be mastering
you should not be mastering
she should not be mastering
we should not be mastering
you should not be mastering
they should not be mastering	I should not have mastered
you should not have mastered
she should not have mastered
we should not have mastered
you should not have mastered
they should not have mastered	I should not have been mastering
you should not have been mastering
she should not have been mastering
we should not have been mastering
you should not have been mastering
they should not have been mastering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I master?
should you master?
should she master?
should we master?
should you master?
should they master? 	should I be mastering?
should you be mastering?
should she be mastering?
should we be mastering?
should you be mastering?
should they be mastering? 	should I have mastered?
should you have mastered?
should she have mastered?
should we have mastered?
should you have mastered?
should they have mastered? 	should I have been mastering?
should you have been mastering?
should she have been mastering?
should we have been mastering?
should you have been mastering?
should they have been mastering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I not master?
should you not master?
should she not master?
should we not master?
should you not master?
should they not master? 	should I not be mastering?
should you not be mastering?
should she not be mastering?
should we not be mastering?
should you not be mastering?
should they not be mastering? 	should I not have mastered?
should you not have mastered?
should she not have mastered?
should we not have mastered?
should you not have mastered?
should they not have mastered? 	should I not have been mastering?
should you not have been mastering?
should she not have been mastering?
should we not have been mastering?
should you not have been mastering?
should they not have been mastering?