English verb conjugation
MAY REFEREE

Regular verb: referee - refereed - refereed

Affirmation

Simple form	V-ing form
I may referee you may referee he may referee we may referee you may referee they may referee	I may be refereeing you may be refereeing he may be refereeing we may be refereeing you may be refereeing they may be refereeing
Perfect	V-ing perfect
I may have refereed you may have refereed he may have refereed we may have refereed you may have refereed they may have refereed	I may have been refereeing you may have been refereeing he may have been refereeing we may have been refereeing you may have been refereeing they may have been refereeing

Negation

Simple form	V-ing form
I may not referee you may not referee he may not referee we may not referee you may not referee they may not referee	I may not be refereeing you may not be refereeing he may not be refereeing we may not be refereeing you may not be refereeing they may not be refereeing
Perfect	V-ing perfect
I may not have refereed you may not have refereed he may not have refereed we may not have refereed you may not have refereed they may not have refereed	I may not have been refereeing you may not have been refereeing he may not have been refereeing we may not have been refereeing you may not have been refereeing they may not have been refereeing

Interrogative form

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

Interro-negative form

Simple form	V-ing form
may I not referee? may you not referee? may he not referee? may we not referee? may you not referee? may they not referee?	may I not be refereeing? may you not be refereeing? may he not be refereeing? may we not be refereeing? may you not be refereeing? may they not be refereeing?
Perfect	V-ing perfect
may I not have refereed? may you not have refereed? may he not have refereed? may we not have refereed? may you not have refereed? may they not have refereed?	may I not have been refereeing? may you not have been refereeing? may he not have been refereeing? may we not have been refereeing? may you not have been refereeing? may they not have been refereeing?