English verb conjugation
CAN UNDERRUN

Irregular verb: underrun - underran - underrun

Affirmation

Simple form	V-ing form
I can underrun you can underrun he can underrun we can underrun you can underrun they can underrun	I can be underruning you can be underruning he can be underruning we can be underruning you can be underruning they can be underruning
Perfect	V-ing perfect
I can have underrun you can have underrun he can have underrun we can have underrun you can have underrun they can have underrun	I can have been underruning you can have been underruning he can have been underruning we can have been underruning you can have been underruning they can have been underruning

Negation

Simple form	V-ing form
I cannot underrun you cannot underrun he cannot underrun we cannot underrun you cannot underrun they cannot underrun	I cannot be underruning you cannot be underruning he cannot be underruning we cannot be underruning you cannot be underruning they cannot be underruning
Perfect	V-ing perfect
I cannot have underrun you cannot have underrun he cannot have underrun we cannot have underrun you cannot have underrun they cannot have underrun	I cannot have been underruning you cannot have been underruning he cannot have been underruning we cannot have been underruning you cannot have been underruning they cannot have been underruning

Interrogative form

Simple form	V-ing form
can I underrun? can you underrun? can he underrun? can we underrun? can you underrun? can they underrun?	can I be underruning? can you be underruning? can he be underruning? can we be underruning? can you be underruning? can they be underruning?
Perfect	V-ing perfect
can I have underrun? can you have underrun? can he have underrun? can we have underrun? can you have underrun? can they have underrun?	can I have been underruning? can you have been underruning? can he have been underruning? can we have been underruning? can you have been underruning? can they have been underruning?

Interro-negative form

Simple form	V-ing form
can I not underrun? can you not underrun? can he not underrun? can we not underrun? can you not underrun? can they not underrun?	can I not be underruning? can you not be underruning? can he not be underruning? can we not be underruning? can you not be underruning? can they not be underruning?
Perfect	V-ing perfect
can I not have underrun? can you not have underrun? can he not have underrun? can we not have underrun? can you not have underrun? can they not have underrun?	can I not have been underruning? can you not have been underruning? can he not have been underruning? can we not have been underruning? can you not have been underruning? can they not have been underruning?