should supersede
Regular verb: supersede - superseded- superseded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd supersede
you'd supersede
she'd supersede
we'd supersede
you'd supersede
they'd supersede 	I'd be superseding
you'd be superseding
she'd be superseding
we'd be superseding
you'd be superseding
they'd be superseding	I should've superseded
you should've superseded
she should've superseded
we should've superseded
you should've superseded
they should've superseded	I should've been superseding
you should've been superseding
she should've been superseding
we should've been superseding
you should've been superseding
they should've been superseding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't supersede
you shouldn't supersede
she shouldn't supersede
we shouldn't supersede
you shouldn't supersede
they shouldn't supersede 	I shouldn't be superseding
you shouldn't be superseding
she shouldn't be superseding
we shouldn't be superseding
you shouldn't be superseding
they shouldn't be superseding	I shouldn't have superseded
you shouldn't have superseded
she shouldn't have superseded
we shouldn't have superseded
you shouldn't have superseded
they shouldn't have superseded	I shouldn't have been superseding
you shouldn't have been superseding
she shouldn't have been superseding
we shouldn't have been superseding
you shouldn't have been superseding
they shouldn't have been superseding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I supersede?
should you supersede?
should she supersede?
should we supersede?
should you supersede?
should they supersede? 	should I be superseding?
should you be superseding?
should she be superseding?
should we be superseding?
should you be superseding?
should they be superseding? 	should I have superseded?
should you have superseded?
should she have superseded?
should we have superseded?
should you have superseded?
should they have superseded? 	should I have been superseding?
should you have been superseding?
should she have been superseding?
should we have been superseding?
should you have been superseding?
should they have been superseding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I supersede?
shouldn't you supersede?
shouldn't she supersede?
shouldn't we supersede?
shouldn't you supersede?
shouldn't they supersede? 	shouldn't I be superseding?
shouldn't you be superseding?
shouldn't she be superseding?
shouldn't we be superseding?
shouldn't you be superseding?
shouldn't they be superseding? 	shouldn't I have superseded?
shouldn't you have superseded?
shouldn't she have superseded?
shouldn't we have superseded?
shouldn't you have superseded?
shouldn't they have superseded? 	shouldn't I have been superseding?
shouldn't you have been superseding?
shouldn't she have been superseding?
shouldn't we have been superseding?
shouldn't you have been superseding?
shouldn't they have been superseding?