English verb conjugation
SHOULD KNOW

Irregular verb: know - knew - known

Affirmation

Simple form	V-ing form
I should know you should know he should know we should know you should know they should know	I should be knowing you should be knowing he should be knowing we should be knowing you should be knowing they should be knowing
Perfect	V-ing perfect
I should have known you should have known he should have known we should have known you should have known they should have known	I should have been knowing you should have been knowing he should have been knowing we should have been knowing you should have been knowing they should have been knowing

Negation

Simple form	V-ing form
I should not know you should not know he should not know we should not know you should not know they should not know	I should not be knowing you should not be knowing he should not be knowing we should not be knowing you should not be knowing they should not be knowing
Perfect	V-ing perfect
I should not have known you should not have known he should not have known we should not have known you should not have known they should not have known	I should not have been knowing you should not have been knowing he should not have been knowing we should not have been knowing you should not have been knowing they should not have been knowing

Interrogative form

Simple form	V-ing form
should I know? should you know? should he know? should we know? should you know? should they know?	should I be knowing? should you be knowing? should he be knowing? should we be knowing? should you be knowing? should they be knowing?
Perfect	V-ing perfect
should I have known? should you have known? should he have known? should we have known? should you have known? should they have known?	should I have been knowing? should you have been knowing? should he have been knowing? should we have been knowing? should you have been knowing? should they have been knowing?

Interro-negative form

Simple form	V-ing form
should I not know? should you not know? should he not know? should we not know? should you not know? should they not know?	should I not be knowing? should you not be knowing? should he not be knowing? should we not be knowing? should you not be knowing? should they not be knowing?
Perfect	V-ing perfect
should I not have known? should you not have known? should he not have known? should we not have known? should you not have known? should they not have known?	should I not have been knowing? should you not have been knowing? should he not have been knowing? should we not have been knowing? should you not have been knowing? should they not have been knowing?