should unscrew
Regular verb: unscrew - unscrewed- unscrewed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd unscrew
you'd unscrew
she'd unscrew
we'd unscrew
you'd unscrew
they'd unscrew 	I'd be unscrewing
you'd be unscrewing
she'd be unscrewing
we'd be unscrewing
you'd be unscrewing
they'd be unscrewing	I should've unscrewed
you should've unscrewed
she 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
she 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
she 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
she 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
she 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
she 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 she unscrew?
should we unscrew?
should you unscrew?
should they unscrew? 	should I be unscrewing?
should you be unscrewing?
should she be unscrewing?
should we be unscrewing?
should you be unscrewing?
should they be unscrewing? 	should I have unscrewed?
should you have unscrewed?
should she 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 she 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 she 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 she 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 she 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 she have been unscrewing?
shouldn't we have been unscrewing?
shouldn't you have been unscrewing?
shouldn't they have been unscrewing?