can master
Verbo regular: master - mastered- mastered

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

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can't master
you can't master
she can't master
we can't master
you can't master
they can't master 	I can't be mastering
you can't be mastering
she can't be mastering
we can't be mastering
you can't be mastering
they can't be mastering	I can't have mastered
you can't have mastered
she can't have mastered
we can't have mastered
you can't have mastered
they can't have mastered	I can't have been mastering
you can't have been mastering
she can't have been mastering
we can't have been mastering
you can't have been mastering
they can't have been mastering	

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

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