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 mustn't know
you mustn't know
she mustn't know
we mustn't know
you mustn't know
they mustn't know

V-ing form

I mustn't be knowing
you mustn't be knowing
she mustn't be knowing
we mustn't be knowing
you mustn't be knowing
they mustn't be knowing

Perfect

I mustn't have known
you mustn't have known
she mustn't have known
we mustn't have known
you mustn't have known
they mustn't have known

V-ing perfect

I mustn't have been knowing
you mustn't have been knowing
she mustn't have been knowing
we mustn't have been knowing
you mustn't have been knowing
they mustn't 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

mustn't I know?
mustn't you know?
mustn't she know?
mustn't we know?
mustn't you know?
mustn't they know?

V-ing form

mustn't I be knowing?
mustn't you be knowing?
mustn't she be knowing?
mustn't we be knowing?
mustn't you be knowing?
mustn't they be knowing?

Perfect

mustn't I have known?
mustn't you have known?
mustn't she have known?
mustn't we have known?
mustn't you have known?
mustn't they have known?

V-ing perfect

mustn't I have been knowing?
mustn't you have been knowing?
mustn't she have been knowing?
mustn't we have been knowing?
mustn't you have been knowing?
mustn't they have been knowing?

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