must know
Verbe irrégulier : know - knew- known
Traduction française : savoir - connaître 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must know
you must know
he must know
we must know
you must know
they must know 	I must be knowing
you must be knowing
he must be knowing
we must be knowing
you must be knowing
they must be knowing	I must have known
you must have known
he 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
he must have been knowing
we must have been knowing
you must have been knowing
they must have been knowing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not know
you must not know
he 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
he 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
he 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
he must not have been knowing
we must not have been knowing
you must not have been knowing
they must not have been knowing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I know?
must you know?
must he know?
must we know?
must you know?
must they know? 	must I be knowing?
must you be knowing?
must he be knowing?
must we be knowing?
must you be knowing?
must they be knowing? 	must I have known?
must you have known?
must he 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 he have been knowing?
must we have been knowing?
must you have been knowing?
must they have been knowing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not know?
must you not know?
must he 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 he 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 he 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 he not have been knowing?
must we not have been knowing?
must you not have been knowing?
must they not have been knowing?