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