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 couldn't know
you couldn't know
he couldn't know
we couldn't know
you couldn't know
they couldn't know

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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

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