should underperform
Regular verb: underperform - underperformed- underperformed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd underperform
you'd underperform
he'd underperform
we'd underperform
you'd underperform
they'd underperform 	I'd be underperforming
you'd be underperforming
he'd be underperforming
we'd be underperforming
you'd be underperforming
they'd be underperforming	I should've underperformed
you should've underperformed
he 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
he 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
he 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
he 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
he 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
he 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 he underperform?
should we underperform?
should you underperform?
should they underperform? 	should I be underperforming?
should you be underperforming?
should he be underperforming?
should we be underperforming?
should you be underperforming?
should they be underperforming? 	should I have underperformed?
should you have underperformed?
should he 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 he 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 he 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 he 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 he 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 he have been underperforming?
shouldn't we have been underperforming?
shouldn't you have been underperforming?
shouldn't they have been underperforming?