must know
Verbo irregular: know - knew- known

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must know
you must know
she must know
we must know
you must know
they must know 	I must be knowing
you must be knowing
she must be knowing
we must be knowing
you must be knowing
they must be knowing	I must have known
you must have known
she must have known
we must have known
you must have known
they must have known	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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not know
you must not know
she must not know
we must not know
you must not know
they must not know 	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	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	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	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I know?
must you know?
must she know?
must we know?
must you know?
must they know? 	must I be knowing?
must you be knowing?
must she be knowing?
must we be knowing?
must you be knowing?
must they be knowing? 	must I have known?
must you have known?
must she have known?
must we have known?
must you have known?
must they have known? 	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? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not know?
must you not know?
must she not know?
must we not know?
must you not know?
must they not know? 	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? 	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? 	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?