English verb conjugation
SHOULD WITNESS

Regular verb: witness - witnessed - witnessed

Affirmation

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