English verb conjugation COULD PERFORM

Regular verb: perform - performed - performed

Affirmation

Simple form

I could perform
you could perform
he could perform
we could perform
you could perform
they could perform

V-ing form

I could be performing
you could be performing
he could be performing
we could be performing
you could be performing
they could be performing

Perfect

I could have performed
you could have performed
he could have performed
we could have performed
you could have performed
they could have performed

V-ing perfect

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

Negation

Simple form

I could not perform
you could not perform
he could not perform
we could not perform
you could not perform
they could not perform

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I perform?
could you perform?
could he perform?
could we perform?
could you perform?
could they perform?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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