English verb conjugation
SHOULD REF

Regular verb: ref - refed - refed

Affirmation

Simple form	V-ing form
I'd ref you'd ref she'd ref we'd ref you'd ref they'd ref	I'd be refing you'd be refing she'd be refing we'd be refing you'd be refing they'd be refing
Perfect	V-ing perfect
I should've refed you should've refed she should've refed we should've refed you should've refed they should've refed	I should've been refing you should've been refing she should've been refing we should've been refing you should've been refing they should've been refing

Negation

Simple form	V-ing form
I shouldn't ref you shouldn't ref she shouldn't ref we shouldn't ref you shouldn't ref they shouldn't ref	I shouldn't be refing you shouldn't be refing she shouldn't be refing we shouldn't be refing you shouldn't be refing they shouldn't be refing
Perfect	V-ing perfect
I shouldn't have refed you shouldn't have refed she shouldn't have refed we shouldn't have refed you shouldn't have refed they shouldn't have refed	I shouldn't have been refing you shouldn't have been refing she shouldn't have been refing we shouldn't have been refing you shouldn't have been refing they shouldn't have been refing

Interrogative form

Simple form	V-ing form
should I ref? should you ref? should she ref? should we ref? should you ref? should they ref?	should I be refing? should you be refing? should she be refing? should we be refing? should you be refing? should they be refing?
Perfect	V-ing perfect
should I have refed? should you have refed? should she have refed? should we have refed? should you have refed? should they have refed?	should I have been refing? should you have been refing? should she have been refing? should we have been refing? should you have been refing? should they have been refing?

Interro-negative form

Simple form	V-ing form
shouldn't I ref? shouldn't you ref? shouldn't she ref? shouldn't we ref? shouldn't you ref? shouldn't they ref?	shouldn't I be refing? shouldn't you be refing? shouldn't she be refing? shouldn't we be refing? shouldn't you be refing? shouldn't they be refing?
Perfect	V-ing perfect
shouldn't I have refed? shouldn't you have refed? shouldn't she have refed? shouldn't we have refed? shouldn't you have refed? shouldn't they have refed?	shouldn't I have been refing? shouldn't you have been refing? shouldn't she have been refing? shouldn't we have been refing? shouldn't you have been refing? shouldn't they have been refing?