I'd be flexing you'd be flexing she'd be flexing we'd be flexing you'd be flexing they'd be flexing
Perfect
I should've flexed you should've flexed she should've flexed we should've flexed you should've flexed they should've flexed
V-ing perfect
I should've been flexing you should've been flexing she should've been flexing we should've been flexing you should've been flexing they should've been flexing
Negation
Simple form
I shouldn't flex you shouldn't flex she shouldn't flex we shouldn't flex you shouldn't flex they shouldn't flex
V-ing form
I shouldn't be flexing you shouldn't be flexing she shouldn't be flexing we shouldn't be flexing you shouldn't be flexing they shouldn't be flexing
Perfect
I shouldn't have flexed you shouldn't have flexed she shouldn't have flexed we shouldn't have flexed you shouldn't have flexed they shouldn't have flexed
V-ing perfect
I shouldn't have been flexing you shouldn't have been flexing she shouldn't have been flexing we shouldn't have been flexing you shouldn't have been flexing they shouldn't have been flexing
Interrogative form
Simple form
should I flex? should you flex? should she flex? should we flex? should you flex? should they flex?
V-ing form
should I be flexing? should you be flexing? should she be flexing? should we be flexing? should you be flexing? should they be flexing?
Perfect
should I have flexed? should you have flexed? should she have flexed? should we have flexed? should you have flexed? should they have flexed?
V-ing perfect
should I have been flexing? should you have been flexing? should she have been flexing? should we have been flexing? should you have been flexing? should they have been flexing?
Interro-negative form
Simple form
shouldn't I flex? shouldn't you flex? shouldn't she flex? shouldn't we flex? shouldn't you flex? shouldn't they flex?
V-ing form
shouldn't I be flexing? shouldn't you be flexing? shouldn't she be flexing? shouldn't we be flexing? shouldn't you be flexing? shouldn't they be flexing?
Perfect
shouldn't I have flexed? shouldn't you have flexed? shouldn't she have flexed? shouldn't we have flexed? shouldn't you have flexed? shouldn't they have flexed?
V-ing perfect
shouldn't I have been flexing? shouldn't you have been flexing? shouldn't she have been flexing? shouldn't we have been flexing? shouldn't you have been flexing? shouldn't they have been flexing?