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 couldn't underuse
you couldn't underuse
he couldn't underuse
we couldn't underuse
you couldn't underuse
they couldn't underuse

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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

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