I should witness you should witness he should witness we should witness you should witness they should witness
V-ing form
I should be witnessing you should be witnessing he should be witnessing we should be witnessing you should be witnessing they should be witnessing
Perfect
I should have witnessed you should have witnessed he should have witnessed we should have witnessed you should have witnessed they should have witnessed
V-ing perfect
I should have been witnessing you should have been witnessing he should have been witnessing we should have been witnessing you should have been witnessing they should have been witnessing
Negation
Simple form
I should not witness you should not witness he should not witness we should not witness you should not witness they should not witness
V-ing form
I should not be witnessing you should not be witnessing he should not be witnessing we should not be witnessing you should not be witnessing they should not be witnessing
Perfect
I should not have witnessed you should not have witnessed he should not have witnessed we should not have witnessed you should not have witnessed they should not have witnessed
V-ing perfect
I should not have been witnessing you should not have been witnessing he should not have been witnessing we should not have been witnessing you should not have been witnessing they should not 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
should I not witness? should you not witness? should he not witness? should we not witness? should you not witness? should they not witness?
V-ing form
should I not be witnessing? should you not be witnessing? should he not be witnessing? should we not be witnessing? should you not be witnessing? should they not be witnessing?
Perfect
should I not have witnessed? should you not have witnessed? should he not have witnessed? should we not have witnessed? should you not have witnessed? should they not have witnessed?
V-ing perfect
should I not have been witnessing? should you not have been witnessing? should he not have been witnessing? should we not have been witnessing? should you not have been witnessing? should they not have been witnessing?