should unnail
Regular verb: unnail - unnailed- unnailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd unnail
you'd unnail
he'd unnail
we'd unnail
you'd unnail
they'd unnail 	I'd be unnailing
you'd be unnailing
he'd be unnailing
we'd be unnailing
you'd be unnailing
they'd be unnailing	I should've unnailed
you should've unnailed
he should've unnailed
we should've unnailed
you should've unnailed
they should've unnailed	I should've been unnailing
you should've been unnailing
he should've been unnailing
we should've been unnailing
you should've been unnailing
they should've been unnailing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't unnail
you shouldn't unnail
he shouldn't unnail
we shouldn't unnail
you shouldn't unnail
they shouldn't unnail 	I shouldn't be unnailing
you shouldn't be unnailing
he shouldn't be unnailing
we shouldn't be unnailing
you shouldn't be unnailing
they shouldn't be unnailing	I shouldn't have unnailed
you shouldn't have unnailed
he shouldn't have unnailed
we shouldn't have unnailed
you shouldn't have unnailed
they shouldn't have unnailed	I shouldn't have been unnailing
you shouldn't have been unnailing
he shouldn't have been unnailing
we shouldn't have been unnailing
you shouldn't have been unnailing
they shouldn't have been unnailing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I unnail?
should you unnail?
should he unnail?
should we unnail?
should you unnail?
should they unnail? 	should I be unnailing?
should you be unnailing?
should he be unnailing?
should we be unnailing?
should you be unnailing?
should they be unnailing? 	should I have unnailed?
should you have unnailed?
should he have unnailed?
should we have unnailed?
should you have unnailed?
should they have unnailed? 	should I have been unnailing?
should you have been unnailing?
should he have been unnailing?
should we have been unnailing?
should you have been unnailing?
should they have been unnailing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I unnail?
shouldn't you unnail?
shouldn't he unnail?
shouldn't we unnail?
shouldn't you unnail?
shouldn't they unnail? 	shouldn't I be unnailing?
shouldn't you be unnailing?
shouldn't he be unnailing?
shouldn't we be unnailing?
shouldn't you be unnailing?
shouldn't they be unnailing? 	shouldn't I have unnailed?
shouldn't you have unnailed?
shouldn't he have unnailed?
shouldn't we have unnailed?
shouldn't you have unnailed?
shouldn't they have unnailed? 	shouldn't I have been unnailing?
shouldn't you have been unnailing?
shouldn't he have been unnailing?
shouldn't we have been unnailing?
shouldn't you have been unnailing?
shouldn't they have been unnailing?