English verb conjugation MUST UNDERUSE

Regular verb: underuse - underused - underused

Affirmation

Simple form

I must underuse
you must underuse
he must underuse
we must underuse
you must underuse
they must underuse

V-ing form

I must be underusing
you must be underusing
he must be underusing
we must be underusing
you must be underusing
they must be underusing

Perfect

I must have underused
you must have underused
he must have underused
we must have underused
you must have underused
they must have underused

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I underuse?
must you underuse?
must he underuse?
must we underuse?
must you underuse?
must they underuse?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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