shall underperform
Regular verb: underperform - underperformed- underperformed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'll underperform
you'll underperform
he'll underperform
we'll underperform
you'll underperform
they'll underperform 	I'll be underperforming
you'll be underperforming
he'll be underperforming
we'll be underperforming
you'll be underperforming
they'll be underperforming	I'll have underperformed
you'll have underperformed
he'll have underperformed
we'll have underperformed
you'll have underperformed
they'll have underperformed	I'll have been underperforming
you'll have been underperforming
he'll have been underperforming
we'll have been underperforming
you'll have been underperforming
they'll have been underperforming	

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

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

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