I'd be checking you'd be checking he'd be checking we'd be checking you'd be checking they'd be checking
Perfect
I should've checked you should've checked he should've checked we should've checked you should've checked they should've checked
V-ing perfect
I should've been checking you should've been checking he should've been checking we should've been checking you should've been checking they should've been checking
Negation
Simple form
I shouldn't check you shouldn't check he shouldn't check we shouldn't check you shouldn't check they shouldn't check
V-ing form
I shouldn't be checking you shouldn't be checking he shouldn't be checking we shouldn't be checking you shouldn't be checking they shouldn't be checking
Perfect
I shouldn't have checked you shouldn't have checked he shouldn't have checked we shouldn't have checked you shouldn't have checked they shouldn't have checked
V-ing perfect
I shouldn't have been checking you shouldn't have been checking he shouldn't have been checking we shouldn't have been checking you shouldn't have been checking they shouldn't have been checking
Interrogative form
Simple form
should I check? should you check? should he check? should we check? should you check? should they check?
V-ing form
should I be checking? should you be checking? should he be checking? should we be checking? should you be checking? should they be checking?
Perfect
should I have checked? should you have checked? should he 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 he have been checking? should we have been checking? should you have been checking? should they have been checking?
Interro-negative form
Simple form
shouldn't I check? shouldn't you check? shouldn't he check? shouldn't we check? shouldn't you check? shouldn't they check?
V-ing form
shouldn't I be checking? shouldn't you be checking? shouldn't he be checking? shouldn't we be checking? shouldn't you be checking? shouldn't they be checking?
Perfect
shouldn't I have checked? shouldn't you have checked? shouldn't he have checked? shouldn't we have checked? shouldn't you have checked? shouldn't they have checked?
V-ing perfect
shouldn't I have been checking? shouldn't you have been checking? shouldn't he have been checking? shouldn't we have been checking? shouldn't you have been checking? shouldn't they have been checking?