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