English verb conjugation
SHOULD WITNESS

Regular verb: witness - witnessed - witnessed

Affirmation

Simple form	V-ing form
I'd witness you'd witness he'd witness we'd witness you'd witness they'd witness	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	V-ing 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	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	V-ing 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	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	V-ing 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	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	V-ing form
should I witness? should you witness? should he witness? should we witness? should you witness? should they witness?	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	V-ing 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?	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	V-ing 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?	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	V-ing 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?	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?