can fester
Verbo regular: fester - festered- festered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can fester
you can fester
he can fester
we can fester
you can fester
they can fester 	I can be festering
you can be festering
he can be festering
we can be festering
you can be festering
they can be festering	I can have festered
you can have festered
he can have festered
we can have festered
you can have festered
they can have festered	I can have been festering
you can have been festering
he can have been festering
we can have been festering
you can have been festering
they can have been festering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can't fester
you can't fester
he can't fester
we can't fester
you can't fester
they can't fester 	I can't be festering
you can't be festering
he can't be festering
we can't be festering
you can't be festering
they can't be festering	I can't have festered
you can't have festered
he can't have festered
we can't have festered
you can't have festered
they can't have festered	I can't have been festering
you can't have been festering
he can't have been festering
we can't have been festering
you can't have been festering
they can't have been festering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I fester?
can you fester?
can he fester?
can we fester?
can you fester?
can they fester? 	can I be festering?
can you be festering?
can he be festering?
can we be festering?
can you be festering?
can they be festering? 	can I have festered?
can you have festered?
can he have festered?
can we have festered?
can you have festered?
can they have festered? 	can I have been festering?
can you have been festering?
can he have been festering?
can we have been festering?
can you have been festering?
can they have been festering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can't I fester?
can't you fester?
can't he fester?
can't we fester?
can't you fester?
can't they fester? 	can't I be festering?
can't you be festering?
can't he be festering?
can't we be festering?
can't you be festering?
can't they be festering? 	can't I have festered?
can't you have festered?
can't he have festered?
can't we have festered?
can't you have festered?
can't they have festered? 	can't I have been festering?
can't you have been festering?
can't he have been festering?
can't we have been festering?
can't you have been festering?
can't they have been festering?