English verb conjugation COULD UNDERRUN

Irregular verb: underrun - underran - underrun

Affirmation

Simple form

I could underrun
you could underrun
he could underrun
we could underrun
you could underrun
they could underrun

V-ing form

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

I could have underrun
you could have underrun
he could have underrun
we could have underrun
you could have underrun
they could have underrun

V-ing perfect

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

I could not underrun
you could not underrun
he could not underrun
we could not underrun
you could not underrun
they could not underrun

V-ing form

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

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

V-ing perfect

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

could I underrun?
could you underrun?
could he underrun?
could we underrun?
could you underrun?
could they underrun?

V-ing form

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

could I have underrun?
could you have underrun?
could he have underrun?
could we have underrun?
could you have underrun?
could they have underrun?

V-ing perfect

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

could I not underrun?
could you not underrun?
could he not underrun?
could we not underrun?
could you not underrun?
could they not underrun?

V-ing form

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

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?

V-ing perfect

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?

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