should underperform
Regular verb: underperform - underperformed- underperformed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd underperform
you'd underperform
she'd underperform
we'd underperform
you'd underperform
they'd underperform 	I'd be underperforming
you'd be underperforming
she'd be underperforming
we'd be underperforming
you'd be underperforming
they'd be underperforming	I should've underperformed
you should've underperformed
she should've underperformed
we should've underperformed
you should've underperformed
they should've underperformed	I should've been underperforming
you should've been underperforming
she should've been underperforming
we should've been underperforming
you should've been underperforming
they should've been underperforming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't underperform
you shouldn't underperform
she shouldn't underperform
we shouldn't underperform
you shouldn't underperform
they shouldn't underperform 	I shouldn't be underperforming
you shouldn't be underperforming
she shouldn't be underperforming
we shouldn't be underperforming
you shouldn't be underperforming
they shouldn't be underperforming	I shouldn't have underperformed
you shouldn't have underperformed
she shouldn't have underperformed
we shouldn't have underperformed
you shouldn't have underperformed
they shouldn't have underperformed	I shouldn't have been underperforming
you shouldn't have been underperforming
she shouldn't have been underperforming
we shouldn't have been underperforming
you shouldn't have been underperforming
they shouldn't have been underperforming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I underperform?
should you underperform?
should she underperform?
should we underperform?
should you underperform?
should they underperform? 	should I be underperforming?
should you be underperforming?
should she be underperforming?
should we be underperforming?
should you be underperforming?
should they be underperforming? 	should I have underperformed?
should you have underperformed?
should she have underperformed?
should we have underperformed?
should you have underperformed?
should they have underperformed? 	should I have been underperforming?
should you have been underperforming?
should she have been underperforming?
should we have been underperforming?
should you have been underperforming?
should they have been underperforming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I underperform?
shouldn't you underperform?
shouldn't she underperform?
shouldn't we underperform?
shouldn't you underperform?
shouldn't they underperform? 	shouldn't I be underperforming?
shouldn't you be underperforming?
shouldn't she be underperforming?
shouldn't we be underperforming?
shouldn't you be underperforming?
shouldn't they be underperforming? 	shouldn't I have underperformed?
shouldn't you have underperformed?
shouldn't she have underperformed?
shouldn't we have underperformed?
shouldn't you have underperformed?
shouldn't they have underperformed? 	shouldn't I have been underperforming?
shouldn't you have been underperforming?
shouldn't she have been underperforming?
shouldn't we have been underperforming?
shouldn't you have been underperforming?
shouldn't they have been underperforming?