I'd be knowing you'd be knowing he'd be knowing we'd be knowing you'd be knowing they'd be knowing
Perfect
I should've known you should've known he should've known we should've known you should've known they should've known
V-ing perfect
I should've been knowing you should've been knowing he should've been knowing we should've been knowing you should've been knowing they should've been knowing
Negation
Simple form
I shouldn't know you shouldn't know he shouldn't know we shouldn't know you shouldn't know they shouldn't know
V-ing form
I shouldn't be knowing you shouldn't be knowing he shouldn't be knowing we shouldn't be knowing you shouldn't be knowing they shouldn't be knowing
Perfect
I shouldn't have known you shouldn't have known he shouldn't have known we shouldn't have known you shouldn't have known they shouldn't have known
V-ing perfect
I shouldn't have been knowing you shouldn't have been knowing he shouldn't have been knowing we shouldn't have been knowing you shouldn't have been knowing they shouldn't have been knowing
Interrogative form
Simple form
should I know? should you know? should he know? should we know? should you know? should they know?
V-ing form
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
should I have known? should you have known? should he have known? should we have known? should you have known? should they have known?
V-ing perfect
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
shouldn't I know? shouldn't you know? shouldn't he know? shouldn't we know? shouldn't you know? shouldn't they know?
V-ing form
shouldn't I be knowing? shouldn't you be knowing? shouldn't he be knowing? shouldn't we be knowing? shouldn't you be knowing? shouldn't they be knowing?
Perfect
shouldn't I have known? shouldn't you have known? shouldn't he have known? shouldn't we have known? shouldn't you have known? shouldn't they have known?
V-ing perfect
shouldn't I have been knowing? shouldn't you have been knowing? shouldn't he have been knowing? shouldn't we have been knowing? shouldn't you have been knowing? shouldn't they have been knowing?