I'd be witnessing you'd be witnessing he'd be witnessing we'd be witnessing you'd be witnessing they'd be witnessing
Perfect
I should've witnessed you should've witnessed he 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 he 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 he 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 he 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 he 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 he 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 he witness? should we witness? should you witness? should they witness?
V-ing form
should I be witnessing? should you be witnessing? should he be witnessing? should we be witnessing? should you be witnessing? should they be witnessing?
Perfect
should I have witnessed? should you have witnessed? should he 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 he 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 he 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 he 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 he 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 he have been witnessing? shouldn't we have been witnessing? shouldn't you have been witnessing? shouldn't they have been witnessing?