can mast
Verbo regular: mast - masted- masted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can mast
you can mast
she can mast
we can mast
you can mast
they can mast 	I can be masting
you can be masting
she can be masting
we can be masting
you can be masting
they can be masting	I can have masted
you can have masted
she can have masted
we can have masted
you can have masted
they can have masted	I can have been masting
you can have been masting
she can have been masting
we can have been masting
you can have been masting
they can have been masting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot mast
you cannot mast
she cannot mast
we cannot mast
you cannot mast
they cannot mast 	I cannot be masting
you cannot be masting
she cannot be masting
we cannot be masting
you cannot be masting
they cannot be masting	I cannot have masted
you cannot have masted
she cannot have masted
we cannot have masted
you cannot have masted
they cannot have masted	I cannot have been masting
you cannot have been masting
she cannot have been masting
we cannot have been masting
you cannot have been masting
they cannot have been masting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I mast?
can you mast?
can she mast?
can we mast?
can you mast?
can they mast? 	can I be masting?
can you be masting?
can she be masting?
can we be masting?
can you be masting?
can they be masting? 	can I have masted?
can you have masted?
can she have masted?
can we have masted?
can you have masted?
can they have masted? 	can I have been masting?
can you have been masting?
can she have been masting?
can we have been masting?
can you have been masting?
can they have been masting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not mast?
can you not mast?
can she not mast?
can we not mast?
can you not mast?
can they not mast? 	can I not be masting?
can you not be masting?
can she not be masting?
can we not be masting?
can you not be masting?
can they not be masting? 	can I not have masted?
can you not have masted?
can she not have masted?
can we not have masted?
can you not have masted?
can they not have masted? 	can I not have been masting?
can you not have been masting?
can she not have been masting?
can we not have been masting?
can you not have been masting?
can they not have been masting?