must fester
Verbo regular: fester - festered- festered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must fester
you must fester
he must fester
we must fester
you must fester
they must fester 	I must be festering
you must be festering
he must be festering
we must be festering
you must be festering
they must be festering	I must have festered
you must have festered
he must have festered
we must have festered
you must have festered
they must have festered	I must have been festering
you must have been festering
he must have been festering
we must have been festering
you must have been festering
they must have been festering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't fester
you mustn't fester
he mustn't fester
we mustn't fester
you mustn't fester
they mustn't fester 	I mustn't be festering
you mustn't be festering
he mustn't be festering
we mustn't be festering
you mustn't be festering
they mustn't be festering	I mustn't have festered
you mustn't have festered
he mustn't have festered
we mustn't have festered
you mustn't have festered
they mustn't have festered	I mustn't have been festering
you mustn't have been festering
he mustn't have been festering
we mustn't have been festering
you mustn't have been festering
they mustn't have been festering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I fester?
must you fester?
must he fester?
must we fester?
must you fester?
must they fester? 	must I be festering?
must you be festering?
must he be festering?
must we be festering?
must you be festering?
must they be festering? 	must I have festered?
must you have festered?
must he have festered?
must we have festered?
must you have festered?
must they have festered? 	must I have been festering?
must you have been festering?
must he have been festering?
must we have been festering?
must you have been festering?
must they have been festering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I fester?
mustn't you fester?
mustn't he fester?
mustn't we fester?
mustn't you fester?
mustn't they fester? 	mustn't I be festering?
mustn't you be festering?
mustn't he be festering?
mustn't we be festering?
mustn't you be festering?
mustn't they be festering? 	mustn't I have festered?
mustn't you have festered?
mustn't he have festered?
mustn't we have festered?
mustn't you have festered?
mustn't they have festered? 	mustn't I have been festering?
mustn't you have been festering?
mustn't he have been festering?
mustn't we have been festering?
mustn't you have been festering?
mustn't they have been festering?