I'd be duping you'd be duping he'd be duping we'd be duping you'd be duping they'd be duping
Perfect
I should've duped you should've duped he should've duped we should've duped you should've duped they should've duped
V-ing perfect
I should've been duping you should've been duping he should've been duping we should've been duping you should've been duping they should've been duping
Negation
Simple form
I shouldn't dupe you shouldn't dupe he shouldn't dupe we shouldn't dupe you shouldn't dupe they shouldn't dupe
V-ing form
I shouldn't be duping you shouldn't be duping he shouldn't be duping we shouldn't be duping you shouldn't be duping they shouldn't be duping
Perfect
I shouldn't have duped you shouldn't have duped he shouldn't have duped we shouldn't have duped you shouldn't have duped they shouldn't have duped
V-ing perfect
I shouldn't have been duping you shouldn't have been duping he shouldn't have been duping we shouldn't have been duping you shouldn't have been duping they shouldn't have been duping
Interrogative form
Simple form
should I dupe? should you dupe? should he dupe? should we dupe? should you dupe? should they dupe?
V-ing form
should I be duping? should you be duping? should he be duping? should we be duping? should you be duping? should they be duping?
Perfect
should I have duped? should you have duped? should he have duped? should we have duped? should you have duped? should they have duped?
V-ing perfect
should I have been duping? should you have been duping? should he have been duping? should we have been duping? should you have been duping? should they have been duping?
Interro-negative form
Simple form
shouldn't I dupe? shouldn't you dupe? shouldn't he dupe? shouldn't we dupe? shouldn't you dupe? shouldn't they dupe?
V-ing form
shouldn't I be duping? shouldn't you be duping? shouldn't he be duping? shouldn't we be duping? shouldn't you be duping? shouldn't they be duping?
Perfect
shouldn't I have duped? shouldn't you have duped? shouldn't he have duped? shouldn't we have duped? shouldn't you have duped? shouldn't they have duped?
V-ing perfect
shouldn't I have been duping? shouldn't you have been duping? shouldn't he have been duping? shouldn't we have been duping? shouldn't you have been duping? shouldn't they have been duping?