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