English verb conjugation
SHOULD RETURN

Regular verb: return - returned - returned

Affirmation

Simple form	V-ing form
I'd return you'd return he'd return we'd return you'd return they'd return	I'd be returning you'd be returning he'd be returning we'd be returning you'd be returning they'd be returning
Perfect	V-ing perfect
I should've returned you should've returned he should've returned we should've returned you should've returned they should've returned	I should've been returning you should've been returning he should've been returning we should've been returning you should've been returning they should've been returning

Negation

Simple form	V-ing form
I shouldn't return you shouldn't return he shouldn't return we shouldn't return you shouldn't return they shouldn't return	I shouldn't be returning you shouldn't be returning he shouldn't be returning we shouldn't be returning you shouldn't be returning they shouldn't be returning
Perfect	V-ing perfect
I shouldn't have returned you shouldn't have returned he shouldn't have returned we shouldn't have returned you shouldn't have returned they shouldn't have returned	I shouldn't have been returning you shouldn't have been returning he shouldn't have been returning we shouldn't have been returning you shouldn't have been returning they shouldn't have been returning

Interrogative form

Simple form	V-ing form
should I return? should you return? should he return? should we return? should you return? should they return?	should I be returning? should you be returning? should he be returning? should we be returning? should you be returning? should they be returning?
Perfect	V-ing perfect
should I have returned? should you have returned? should he have returned? should we have returned? should you have returned? should they have returned?	should I have been returning? should you have been returning? should he have been returning? should we have been returning? should you have been returning? should they have been returning?

Interro-negative form

Simple form	V-ing form
shouldn't I return? shouldn't you return? shouldn't he return? shouldn't we return? shouldn't you return? shouldn't they return?	shouldn't I be returning? shouldn't you be returning? shouldn't he be returning? shouldn't we be returning? shouldn't you be returning? shouldn't they be returning?
Perfect	V-ing perfect
shouldn't I have returned? shouldn't you have returned? shouldn't he have returned? shouldn't we have returned? shouldn't you have returned? shouldn't they have returned?	shouldn't I have been returning? shouldn't you have been returning? shouldn't he have been returning? shouldn't we have been returning? shouldn't you have been returning? shouldn't they have been returning?