English verb conjugation
SHOULD REFEREE

Regular verb: referee - refereed - refereed

Affirmation

Simple form	V-ing form
I'd referee you'd referee she'd referee we'd referee you'd referee they'd referee	I'd be refereeing you'd be refereeing she'd be refereeing we'd be refereeing you'd be refereeing they'd be refereeing
Perfect	V-ing perfect
I should've refereed you should've refereed she should've refereed we should've refereed you should've refereed they should've refereed	I should've been refereeing you should've been refereeing she should've been refereeing we should've been refereeing you should've been refereeing they should've been refereeing

Negation

Simple form	V-ing form
I shouldn't referee you shouldn't referee she shouldn't referee we shouldn't referee you shouldn't referee they shouldn't referee	I shouldn't be refereeing you shouldn't be refereeing she shouldn't be refereeing we shouldn't be refereeing you shouldn't be refereeing they shouldn't be refereeing
Perfect	V-ing perfect
I shouldn't have refereed you shouldn't have refereed she shouldn't have refereed we shouldn't have refereed you shouldn't have refereed they shouldn't have refereed	I shouldn't have been refereeing you shouldn't have been refereeing she shouldn't have been refereeing we shouldn't have been refereeing you shouldn't have been refereeing they shouldn't have been refereeing

Interrogative form

Simple form	V-ing form
should I referee? should you referee? should she referee? should we referee? should you referee? should they referee?	should I be refereeing? should you be refereeing? should she be refereeing? should we be refereeing? should you be refereeing? should they be refereeing?
Perfect	V-ing perfect
should I have refereed? should you have refereed? should she have refereed? should we have refereed? should you have refereed? should they have refereed?	should I have been refereeing? should you have been refereeing? should she have been refereeing? should we have been refereeing? should you have been refereeing? should they have been refereeing?

Interro-negative form

Simple form	V-ing form
shouldn't I referee? shouldn't you referee? shouldn't she referee? shouldn't we referee? shouldn't you referee? shouldn't they referee?	shouldn't I be refereeing? shouldn't you be refereeing? shouldn't she be refereeing? shouldn't we be refereeing? shouldn't you be refereeing? shouldn't they be refereeing?
Perfect	V-ing perfect
shouldn't I have refereed? shouldn't you have refereed? shouldn't she have refereed? shouldn't we have refereed? shouldn't you have refereed? shouldn't they have refereed?	shouldn't I have been refereeing? shouldn't you have been refereeing? shouldn't she have been refereeing? shouldn't we have been refereeing? shouldn't you have been refereeing? shouldn't they have been refereeing?