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