English verb conjugation
SHOULD DUN

Regular verb: dun - dunned - dunned

Affirmation

Simple form	V-ing form
I'd dun you'd dun he'd dun we'd dun you'd dun they'd dun	I'd be dunning you'd be dunning he'd be dunning we'd be dunning you'd be dunning they'd be dunning
Perfect	V-ing perfect
I should've dunned you should've dunned he should've dunned we should've dunned you should've dunned they should've dunned	I should've been dunning you should've been dunning he should've been dunning we should've been dunning you should've been dunning they should've been dunning

Negation

Simple form	V-ing form
I shouldn't dun you shouldn't dun he shouldn't dun we shouldn't dun you shouldn't dun they shouldn't dun	I shouldn't be dunning you shouldn't be dunning he shouldn't be dunning we shouldn't be dunning you shouldn't be dunning they shouldn't be dunning
Perfect	V-ing perfect
I shouldn't have dunned you shouldn't have dunned he shouldn't have dunned we shouldn't have dunned you shouldn't have dunned they shouldn't have dunned	I shouldn't have been dunning you shouldn't have been dunning he shouldn't have been dunning we shouldn't have been dunning you shouldn't have been dunning they shouldn't have been dunning

Interrogative form

Simple form	V-ing form
should I dun? should you dun? should he dun? should we dun? should you dun? should they dun?	should I be dunning? should you be dunning? should he be dunning? should we be dunning? should you be dunning? should they be dunning?
Perfect	V-ing perfect
should I have dunned? should you have dunned? should he have dunned? should we have dunned? should you have dunned? should they have dunned?	should I have been dunning? should you have been dunning? should he have been dunning? should we have been dunning? should you have been dunning? should they have been dunning?

Interro-negative form

Simple form	V-ing form
shouldn't I dun? shouldn't you dun? shouldn't he dun? shouldn't we dun? shouldn't you dun? shouldn't they dun?	shouldn't I be dunning? shouldn't you be dunning? shouldn't he be dunning? shouldn't we be dunning? shouldn't you be dunning? shouldn't they be dunning?
Perfect	V-ing perfect
shouldn't I have dunned? shouldn't you have dunned? shouldn't he have dunned? shouldn't we have dunned? shouldn't you have dunned? shouldn't they have dunned?	shouldn't I have been dunning? shouldn't you have been dunning? shouldn't he have been dunning? shouldn't we have been dunning? shouldn't you have been dunning? shouldn't they have been dunning?