English verb conjugation MUST UNDERRUN

Irregular verb: underrun - underran - underrun

Affirmation

Simple form

I must underrun
you must underrun
he must underrun
we must underrun
you must underrun
they must underrun

V-ing form

I must be underruning
you must be underruning
he must be underruning
we must be underruning
you must be underruning
they must be underruning

Perfect

I must have underrun
you must have underrun
he must have underrun
we must have underrun
you must have underrun
they must have underrun

V-ing perfect

I must have been underruning
you must have been underruning
he must have been underruning
we must have been underruning
you must have been underruning
they must have been underruning

Negation

Simple form

I mustn't underrun
you mustn't underrun
he mustn't underrun
we mustn't underrun
you mustn't underrun
they mustn't underrun

V-ing form

I mustn't be underruning
you mustn't be underruning
he mustn't be underruning
we mustn't be underruning
you mustn't be underruning
they mustn't be underruning

Perfect

I mustn't have underrun
you mustn't have underrun
he mustn't have underrun
we mustn't have underrun
you mustn't have underrun
they mustn't have underrun

V-ing perfect

I mustn't have been underruning
you mustn't have been underruning
he mustn't have been underruning
we mustn't have been underruning
you mustn't have been underruning
they mustn't have been underruning

Interrogative form

Simple form

must I underrun?
must you underrun?
must he underrun?
must we underrun?
must you underrun?
must they underrun?

V-ing form

must I be underruning?
must you be underruning?
must he be underruning?
must we be underruning?
must you be underruning?
must they be underruning?

Perfect

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

V-ing perfect

must I have been underruning?
must you have been underruning?
must he have been underruning?
must we have been underruning?
must you have been underruning?
must they have been underruning?

Interro-negative form

Simple form

mustn't I underrun?
mustn't you underrun?
mustn't he underrun?
mustn't we underrun?
mustn't you underrun?
mustn't they underrun?

V-ing form

mustn't I be underruning?
mustn't you be underruning?
mustn't he be underruning?
mustn't we be underruning?
mustn't you be underruning?
mustn't they be underruning?

Perfect

mustn't I have underrun?
mustn't you have underrun?
mustn't he have underrun?
mustn't we have underrun?
mustn't you have underrun?
mustn't they have underrun?

V-ing perfect

mustn't I have been underruning?
mustn't you have been underruning?
mustn't he have been underruning?
mustn't we have been underruning?
mustn't you have been underruning?
mustn't they have been underruning?

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