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