can know
Irregular verb: know - knew- known

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can know
you can know
she can know
we can know
you can know
they can know 	I can be knowing
you can be knowing
she can be knowing
we can be knowing
you can be knowing
they can be knowing	I can have known
you can have known
she can have known
we can have known
you can have known
they can have known	I can have been knowing
you can have been knowing
she can have been knowing
we can have been knowing
you can have been knowing
they can have been knowing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't know
you can't know
she can't know
we can't know
you can't know
they can't know 	I can't be knowing
you can't be knowing
she can't be knowing
we can't be knowing
you can't be knowing
they can't be knowing	I can't have known
you can't have known
she can't have known
we can't have known
you can't have known
they can't have known	I can't have been knowing
you can't have been knowing
she can't have been knowing
we can't have been knowing
you can't have been knowing
they can't have been knowing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I know?
can you know?
can she know?
can we know?
can you know?
can they know? 	can I be knowing?
can you be knowing?
can she be knowing?
can we be knowing?
can you be knowing?
can they be knowing? 	can I have known?
can you have known?
can she have known?
can we have known?
can you have known?
can they have known? 	can I have been knowing?
can you have been knowing?
can she have been knowing?
can we have been knowing?
can you have been knowing?
can they have been knowing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I know?
can't you know?
can't she know?
can't we know?
can't you know?
can't they know? 	can't I be knowing?
can't you be knowing?
can't she be knowing?
can't we be knowing?
can't you be knowing?
can't they be knowing? 	can't I have known?
can't you have known?
can't she have known?
can't we have known?
can't you have known?
can't they have known? 	can't I have been knowing?
can't you have been knowing?
can't she have been knowing?
can't we have been knowing?
can't you have been knowing?
can't they have been knowing?