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 couldn't underrun you couldn't underrun he couldn't underrun we couldn't underrun you couldn't underrun they couldn't underrun	I couldn't be underruning you couldn't be underruning he couldn't be underruning we couldn't be underruning you couldn't be underruning they couldn't be underruning
Perfect	V-ing perfect
I couldn't have underrun you couldn't have underrun he couldn't have underrun we couldn't have underrun you couldn't have underrun they couldn't have underrun	I couldn't have been underruning you couldn't have been underruning he couldn't have been underruning we couldn't have been underruning you couldn't have been underruning they couldn't 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
couldn't I underrun? couldn't you underrun? couldn't he underrun? couldn't we underrun? couldn't you underrun? couldn't they underrun?	couldn't I be underruning? couldn't you be underruning? couldn't he be underruning? couldn't we be underruning? couldn't you be underruning? couldn't they be underruning?
Perfect	V-ing perfect
couldn't I have underrun? couldn't you have underrun? couldn't he have underrun? couldn't we have underrun? couldn't you have underrun? couldn't they have underrun?	couldn't I have been underruning? couldn't you have been underruning? couldn't he have been underruning? couldn't we have been underruning? couldn't you have been underruning? couldn't they have been underruning?