English verb conjugation COULD UNDERUSE

Regular verb: underuse - underused - underused

Affirmation

Simple form

I could underuse
you could underuse
he could underuse
we could underuse
you could underuse
they could underuse

V-ing form

I could be underusing
you could be underusing
he could be underusing
we could be underusing
you could be underusing
they could be underusing

Perfect

I could have underused
you could have underused
he could have underused
we could have underused
you could have underused
they could have underused

V-ing perfect

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

Negation

Simple form

I could not underuse
you could not underuse
he could not underuse
we could not underuse
you could not underuse
they could not underuse

V-ing form

I could not be underusing
you could not be underusing
he could not be underusing
we could not be underusing
you could not be underusing
they could not be underusing

Perfect

I could not have underused
you could not have underused
he could not have underused
we could not have underused
you could not have underused
they could not have underused

V-ing perfect

I could not have been underusing
you could not have been underusing
he could not have been underusing
we could not have been underusing
you could not have been underusing
they could not have been underusing

Interrogative form

Simple form

could I underuse?
could you underuse?
could he underuse?
could we underuse?
could you underuse?
could they underuse?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

could I not be underusing?
could you not be underusing?
could he not be underusing?
could we not be underusing?
could you not be underusing?
could they not be underusing?

Perfect

could I not have underused?
could you not have underused?
could he not have underused?
could we not have underused?
could you not have underused?
could they not have underused?

V-ing perfect

could I not have been underusing?
could you not have been underusing?
could he not have been underusing?
could we not have been underusing?
could you not have been underusing?
could they not have been underusing?

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