English verb conjugation MUST KNOW

Irregular verb: know - knew - known

Affirmation

Simple form

I must know
you must know
she must know
we must know
you must know
they must know

V-ing form

I must be knowing
you must be knowing
she must be knowing
we must be knowing
you must be knowing
they must be knowing

Perfect

I must have known
you must have known
she must have known
we must have known
you must have known
they must have known

V-ing perfect

I must have been knowing
you must have been knowing
she must have been knowing
we must have been knowing
you must have been knowing
they must have been knowing

Negation

Simple form

I must not know
you must not know
she must not know
we must not know
you must not know
they must not know

V-ing form

I must not be knowing
you must not be knowing
she must not be knowing
we must not be knowing
you must not be knowing
they must not be knowing

Perfect

I must not have known
you must not have known
she must not have known
we must not have known
you must not have known
they must not have known

V-ing perfect

I must not have been knowing
you must not have been knowing
she must not have been knowing
we must not have been knowing
you must not have been knowing
they must not have been knowing

Interrogative form

Simple form

must I know?
must you know?
must she know?
must we know?
must you know?
must they know?

V-ing form

must I be knowing?
must you be knowing?
must she be knowing?
must we be knowing?
must you be knowing?
must they be knowing?

Perfect

must I have known?
must you have known?
must she have known?
must we have known?
must you have known?
must they have known?

V-ing perfect

must I have been knowing?
must you have been knowing?
must she have been knowing?
must we have been knowing?
must you have been knowing?
must they have been knowing?

Interro-negative form

Simple form

must I not know?
must you not know?
must she not know?
must we not know?
must you not know?
must they not know?

V-ing form

must I not be knowing?
must you not be knowing?
must she not be knowing?
must we not be knowing?
must you not be knowing?
must they not be knowing?

Perfect

must I not have known?
must you not have known?
must she not have known?
must we not have known?
must you not have known?
must they not have known?

V-ing perfect

must I not have been knowing?
must you not have been knowing?
must she not have been knowing?
must we not have been knowing?
must you not have been knowing?
must they not have been knowing?

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