English verb conjugation
COULD UNDERRUN

Irregular verb: underrun - underran - underrun

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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