English verb conjugation COULD UNDERPERFORM

Regular verb: underperform - underperformed - underperformed

Affirmation

Simple form

I could underperform
you could underperform
he could underperform
we could underperform
you could underperform
they could underperform

V-ing form

I could be underperforming
you could be underperforming
he could be underperforming
we could be underperforming
you could be underperforming
they could be underperforming

Perfect

I could have underperformed
you could have underperformed
he could have underperformed
we could have underperformed
you could have underperformed
they could have underperformed

V-ing perfect

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

Negation

Simple form

I could not underperform
you could not underperform
he could not underperform
we could not underperform
you could not underperform
they could not underperform

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I underperform?
could you underperform?
could he underperform?
could we underperform?
could you underperform?
could they underperform?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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