should unscrew
Regular verb: unscrew - unscrewed- unscrewed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd unscrew
you'd unscrew
he'd unscrew
we'd unscrew
you'd unscrew
they'd unscrew 	I'd be unscrewing
you'd be unscrewing
he'd be unscrewing
we'd be unscrewing
you'd be unscrewing
they'd be unscrewing	I should've unscrewed
you should've unscrewed
he should've unscrewed
we should've unscrewed
you should've unscrewed
they should've unscrewed	I should've been unscrewing
you should've been unscrewing
he should've been unscrewing
we should've been unscrewing
you should've been unscrewing
they should've been unscrewing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't unscrew
you shouldn't unscrew
he shouldn't unscrew
we shouldn't unscrew
you shouldn't unscrew
they shouldn't unscrew 	I shouldn't be unscrewing
you shouldn't be unscrewing
he shouldn't be unscrewing
we shouldn't be unscrewing
you shouldn't be unscrewing
they shouldn't be unscrewing	I shouldn't have unscrewed
you shouldn't have unscrewed
he shouldn't have unscrewed
we shouldn't have unscrewed
you shouldn't have unscrewed
they shouldn't have unscrewed	I shouldn't have been unscrewing
you shouldn't have been unscrewing
he shouldn't have been unscrewing
we shouldn't have been unscrewing
you shouldn't have been unscrewing
they shouldn't have been unscrewing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I unscrew?
should you unscrew?
should he unscrew?
should we unscrew?
should you unscrew?
should they unscrew? 	should I be unscrewing?
should you be unscrewing?
should he be unscrewing?
should we be unscrewing?
should you be unscrewing?
should they be unscrewing? 	should I have unscrewed?
should you have unscrewed?
should he have unscrewed?
should we have unscrewed?
should you have unscrewed?
should they have unscrewed? 	should I have been unscrewing?
should you have been unscrewing?
should he have been unscrewing?
should we have been unscrewing?
should you have been unscrewing?
should they have been unscrewing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I unscrew?
shouldn't you unscrew?
shouldn't he unscrew?
shouldn't we unscrew?
shouldn't you unscrew?
shouldn't they unscrew? 	shouldn't I be unscrewing?
shouldn't you be unscrewing?
shouldn't he be unscrewing?
shouldn't we be unscrewing?
shouldn't you be unscrewing?
shouldn't they be unscrewing? 	shouldn't I have unscrewed?
shouldn't you have unscrewed?
shouldn't he have unscrewed?
shouldn't we have unscrewed?
shouldn't you have unscrewed?
shouldn't they have unscrewed? 	shouldn't I have been unscrewing?
shouldn't you have been unscrewing?
shouldn't he have been unscrewing?
shouldn't we have been unscrewing?
shouldn't you have been unscrewing?
shouldn't they have been unscrewing?