English verb conjugation
CAN UNDERPERFORM

Regular verb: underperform - underperformed - underperformed

Affirmation

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

Negation

Simple form	V-ing form
I cannot underperform you cannot underperform he cannot underperform we cannot underperform you cannot underperform they cannot underperform	I cannot be underperforming you cannot be underperforming he cannot be underperforming we cannot be underperforming you cannot be underperforming they cannot be underperforming
Perfect	V-ing perfect
I cannot have underperformed you cannot have underperformed he cannot have underperformed we cannot have underperformed you cannot have underperformed they cannot have underperformed	I cannot have been underperforming you cannot have been underperforming he cannot have been underperforming we cannot have been underperforming you cannot have been underperforming they cannot have been underperforming

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can I not underperform? can you not underperform? can he not underperform? can we not underperform? can you not underperform? can they not underperform?	can I not be underperforming? can you not be underperforming? can he not be underperforming? can we not be underperforming? can you not be underperforming? can they not be underperforming?
Perfect	V-ing perfect
can I not have underperformed? can you not have underperformed? can he not have underperformed? can we not have underperformed? can you not have underperformed? can they not have underperformed?	can I not have been underperforming? can you not have been underperforming? can he not have been underperforming? can we not have been underperforming? can you not have been underperforming? can they not have been underperforming?