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