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