English verb conjugation
SHOULD COUNTERSIGN

Regular verb: countersign - countersigned - countersigned

Affirmation

Simple form	V-ing form
I'd countersign you'd countersign he'd countersign we'd countersign you'd countersign they'd countersign	I'd be countersigning you'd be countersigning he'd be countersigning we'd be countersigning you'd be countersigning they'd be countersigning
Perfect	V-ing perfect
I should've countersigned you should've countersigned he should've countersigned we should've countersigned you should've countersigned they should've countersigned	I should've been countersigning you should've been countersigning he should've been countersigning we should've been countersigning you should've been countersigning they should've been countersigning

Negation

Simple form	V-ing form
I shouldn't countersign you shouldn't countersign he shouldn't countersign we shouldn't countersign you shouldn't countersign they shouldn't countersign	I shouldn't be countersigning you shouldn't be countersigning he shouldn't be countersigning we shouldn't be countersigning you shouldn't be countersigning they shouldn't be countersigning
Perfect	V-ing perfect
I shouldn't have countersigned you shouldn't have countersigned he shouldn't have countersigned we shouldn't have countersigned you shouldn't have countersigned they shouldn't have countersigned	I shouldn't have been countersigning you shouldn't have been countersigning he shouldn't have been countersigning we shouldn't have been countersigning you shouldn't have been countersigning they shouldn't have been countersigning

Interrogative form

Simple form	V-ing form
should I countersign? should you countersign? should he countersign? should we countersign? should you countersign? should they countersign?	should I be countersigning? should you be countersigning? should he be countersigning? should we be countersigning? should you be countersigning? should they be countersigning?
Perfect	V-ing perfect
should I have countersigned? should you have countersigned? should he have countersigned? should we have countersigned? should you have countersigned? should they have countersigned?	should I have been countersigning? should you have been countersigning? should he have been countersigning? should we have been countersigning? should you have been countersigning? should they have been countersigning?

Interro-negative form

Simple form	V-ing form
shouldn't I countersign? shouldn't you countersign? shouldn't he countersign? shouldn't we countersign? shouldn't you countersign? shouldn't they countersign?	shouldn't I be countersigning? shouldn't you be countersigning? shouldn't he be countersigning? shouldn't we be countersigning? shouldn't you be countersigning? shouldn't they be countersigning?
Perfect	V-ing perfect
shouldn't I have countersigned? shouldn't you have countersigned? shouldn't he have countersigned? shouldn't we have countersigned? shouldn't you have countersigned? shouldn't they have countersigned?	shouldn't I have been countersigning? shouldn't you have been countersigning? shouldn't he have been countersigning? shouldn't we have been countersigning? shouldn't you have been countersigning? shouldn't they have been countersigning?