I can underperform you can underperform she can underperform we can underperform you can underperform they can underperform
V-ing form
I can be underperforming you can be underperforming she can be underperforming we can be underperforming you can be underperforming they can be underperforming
Perfect
I can have underperformed you can have underperformed she can have underperformed we can have underperformed you can have underperformed they can have underperformed
V-ing perfect
I can have been underperforming you can have been underperforming she can have been underperforming we can have been underperforming you can have been underperforming they can have been underperforming
Negation
Simple form
I cannot underperform you cannot underperform she cannot underperform we cannot underperform you cannot underperform they cannot underperform
V-ing form
I cannot be underperforming you cannot be underperforming she cannot be underperforming we cannot be underperforming you cannot be underperforming they cannot be underperforming
Perfect
I cannot have underperformed you cannot have underperformed she cannot have underperformed we cannot have underperformed you cannot have underperformed they cannot have underperformed
V-ing perfect
I cannot have been underperforming you cannot have been underperforming she cannot have been underperforming we cannot have been underperforming you cannot have been underperforming they cannot have been underperforming
Interrogative form
Simple form
can I underperform? can you underperform? can she underperform? can we underperform? can you underperform? can they underperform?
V-ing form
can I be underperforming? can you be underperforming? can she be underperforming? can we be underperforming? can you be underperforming? can they be underperforming?
Perfect
can I have underperformed? can you have underperformed? can she have underperformed? can we have underperformed? can you have underperformed? can they have underperformed?
V-ing perfect
can I have been underperforming? can you have been underperforming? can she have been underperforming? can we have been underperforming? can you have been underperforming? can they have been underperforming?
Interro-negative form
Simple form
can I not underperform? can you not underperform? can she not underperform? can we not underperform? can you not underperform? can they not underperform?
V-ing form
can I not be underperforming? can you not be underperforming? can she not be underperforming? can we not be underperforming? can you not be underperforming? can they not be underperforming?
Perfect
can I not have underperformed? can you not have underperformed? can she not have underperformed? can we not have underperformed? can you not have underperformed? can they not have underperformed?
V-ing perfect
can I not have been underperforming? can you not have been underperforming? can she not have been underperforming? can we not have been underperforming? can you not have been underperforming? can they not have been underperforming?