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