I should check you should check she should check we should check you should check they should check
V-ing form
I should be checking you should be checking she should be checking we should be checking you should be checking they should be checking
Perfect
I should have checked you should have checked she should have checked we should have checked you should have checked they should have checked
V-ing perfect
I should have been checking you should have been checking she should have been checking we should have been checking you should have been checking they should have been checking
Negation
Simple form
I should not check you should not check she should not check we should not check you should not check they should not check
V-ing form
I should not be checking you should not be checking she should not be checking we should not be checking you should not be checking they should not be checking
Perfect
I should not have checked you should not have checked she should not have checked we should not have checked you should not have checked they should not have checked
V-ing perfect
I should not have been checking you should not have been checking she should not have been checking we should not have been checking you should not have been checking they should not have been checking
Interrogative form
Simple form
should I check? should you check? should she check? should we check? should you check? should they check?
V-ing form
should I be checking? should you be checking? should she be checking? should we be checking? should you be checking? should they be checking?
Perfect
should I have checked? should you have checked? should she have checked? should we have checked? should you have checked? should they have checked?
V-ing perfect
should I have been checking? should you have been checking? should she have been checking? should we have been checking? should you have been checking? should they have been checking?
Interro-negative form
Simple form
should I not check? should you not check? should she not check? should we not check? should you not check? should they not check?
V-ing form
should I not be checking? should you not be checking? should she not be checking? should we not be checking? should you not be checking? should they not be checking?
Perfect
should I not have checked? should you not have checked? should she not have checked? should we not have checked? should you not have checked? should they not have checked?
V-ing perfect
should I not have been checking? should you not have been checking? should she not have been checking? should we not have been checking? should you not have been checking? should they not have been checking?