should fester
Regular verb: fester - festered- festered

Affirmation 	
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I'd fester
you'd fester
she'd fester
we'd fester
you'd fester
they'd fester 	I'd be festering
you'd be festering
she'd be festering
we'd be festering
you'd be festering
they'd be festering	I should've festered
you should've festered
she should've festered
we should've festered
you should've festered
they should've festered	I should've been festering
you should've been festering
she should've been festering
we should've been festering
you should've been festering
they should've been festering	

Negation 	
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I shouldn't fester
you shouldn't fester
she shouldn't fester
we shouldn't fester
you shouldn't fester
they shouldn't fester 	I shouldn't be festering
you shouldn't be festering
she shouldn't be festering
we shouldn't be festering
you shouldn't be festering
they shouldn't be festering	I shouldn't have festered
you shouldn't have festered
she shouldn't have festered
we shouldn't have festered
you shouldn't have festered
they shouldn't have festered	I shouldn't have been festering
you shouldn't have been festering
she shouldn't have been festering
we shouldn't have been festering
you shouldn't have been festering
they shouldn't have been festering	

Interrogative form 	
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should I fester?
should you fester?
should she fester?
should we fester?
should you fester?
should they fester? 	should I be festering?
should you be festering?
should she be festering?
should we be festering?
should you be festering?
should they be festering? 	should I have festered?
should you have festered?
should she have festered?
should we have festered?
should you have festered?
should they have festered? 	should I have been festering?
should you have been festering?
should she have been festering?
should we have been festering?
should you have been festering?
should they have been festering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I fester?
shouldn't you fester?
shouldn't she fester?
shouldn't we fester?
shouldn't you fester?
shouldn't they fester? 	shouldn't I be festering?
shouldn't you be festering?
shouldn't she be festering?
shouldn't we be festering?
shouldn't you be festering?
shouldn't they be festering? 	shouldn't I have festered?
shouldn't you have festered?
shouldn't she have festered?
shouldn't we have festered?
shouldn't you have festered?
shouldn't they have festered? 	shouldn't I have been festering?
shouldn't you have been festering?
shouldn't she have been festering?
shouldn't we have been festering?
shouldn't you have been festering?
shouldn't they have been festering?