English verb conjugation COULD KNOW

Irregular verb: know - knew - known


Affirmation

Simple form

I could know
you could know
he could know
we could know
you could know
they could know

V-ing form

I could be knowing
you could be knowing
he could be knowing
we could be knowing
you could be knowing
they could be knowing

Perfect

I could have known
you could have known
he could have known
we could have known
you could have known
they could have known

V-ing perfect

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

Negation

Simple form

I could not know
you could not know
he could not know
we could not know
you could not know
they could not know

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I know?
could you know?
could he know?
could we know?
could you know?
could they know?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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