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