should ref
Regular verb: ref - refed- refed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd ref
you'd ref
she'd ref
we'd ref
you'd ref
they'd ref 	I'd be refing
you'd be refing
she'd be refing
we'd be refing
you'd be refing
they'd be refing	I should've refed
you should've refed
she should've refed
we should've refed
you should've refed
they should've refed	I should've been refing
you should've been refing
she should've been refing
we should've been refing
you should've been refing
they should've been refing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't ref
you shouldn't ref
she shouldn't ref
we shouldn't ref
you shouldn't ref
they shouldn't ref 	I shouldn't be refing
you shouldn't be refing
she shouldn't be refing
we shouldn't be refing
you shouldn't be refing
they shouldn't be refing	I shouldn't have refed
you shouldn't have refed
she shouldn't have refed
we shouldn't have refed
you shouldn't have refed
they shouldn't have refed	I shouldn't have been refing
you shouldn't have been refing
she shouldn't have been refing
we shouldn't have been refing
you shouldn't have been refing
they shouldn't have been refing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I ref?
should you ref?
should she ref?
should we ref?
should you ref?
should they ref? 	should I be refing?
should you be refing?
should she be refing?
should we be refing?
should you be refing?
should they be refing? 	should I have refed?
should you have refed?
should she have refed?
should we have refed?
should you have refed?
should they have refed? 	should I have been refing?
should you have been refing?
should she have been refing?
should we have been refing?
should you have been refing?
should they have been refing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I ref?
shouldn't you ref?
shouldn't she ref?
shouldn't we ref?
shouldn't you ref?
shouldn't they ref? 	shouldn't I be refing?
shouldn't you be refing?
shouldn't she be refing?
shouldn't we be refing?
shouldn't you be refing?
shouldn't they be refing? 	shouldn't I have refed?
shouldn't you have refed?
shouldn't she have refed?
shouldn't we have refed?
shouldn't you have refed?
shouldn't they have refed? 	shouldn't I have been refing?
shouldn't you have been refing?
shouldn't she have been refing?
shouldn't we have been refing?
shouldn't you have been refing?
shouldn't they have been refing?